// general inverse projection
// inverse projection entry
public static LP pj_inv(XY xy, PJ P)
{
LP lp;
// can't do as much preliminary checking as with forward
if(xy.x==Libc.HUGE_VAL||xy.y==Libc.HUGE_VAL)
{
lp.lam=lp.phi=Libc.HUGE_VAL;
pj_ctx_set_errno(P.ctx, -15);
return lp;
}
Libc.errno=pj_errno=0;
P.ctx.last_errno=0;
xy.x=(xy.x*P.to_meter-P.x0)*P.ra; // descale and de-offset
xy.y=(xy.y*P.to_meter-P.y0)*P.ra;
lp=P.inv(xy); // inverse project
if(P.ctx.last_errno!=0)
{
lp.lam=lp.phi=Libc.HUGE_VAL;
}
else
{
lp.lam+=P.lam0; // reduce from del lp.lam
if(!P.over) lp.lam=adjlon(lp.lam); // adjust longitude to CM
if(P.geoc&&Math.Abs(Math.Abs(lp.phi)-HALFPI)>EPS12)
lp.phi=Math.Atan(P.one_es*Math.Tan(lp.phi));
}
return lp;
}
//**********************************************************************
// pj_latlong_from_proj()
//
// Return a PJ* definition defining the lat/long coordinate
// system on which a projection is based. If the coordinate
// system passed in is latlong, a clone of the same will be
// returned.
//**********************************************************************
public static PJ pj_latlong_from_proj(PJ pj_in)
{
string defn;
bool got_datum=false;
pj_errno=0;
defn="+proj=latlong";
if(pj_param_t(pj_in.ctx, pj_in.parameters, "datum"))
{
got_datum=true;
defn+=" +datum="+pj_param_s(pj_in.ctx, pj_in.parameters, "datum");
}
else if(pj_param_t(pj_in.ctx, pj_in.parameters, "ellps"))
{
defn+=" +ellps="+pj_param_s(pj_in.ctx, pj_in.parameters, "ellps");
}
else if(pj_param_t(pj_in.ctx, pj_in.parameters, "a"))
{
defn+=" +a="+pj_param_s(pj_in.ctx, pj_in.parameters, "a");
if(pj_param_t(pj_in.ctx, pj_in.parameters, "b")) defn+=" +b="+pj_param_s(pj_in.ctx, pj_in.parameters, "b");
else if(pj_param_t(pj_in.ctx, pj_in.parameters, "es")) defn+=" +es="+pj_param_s(pj_in.ctx, pj_in.parameters, "es");
else if(pj_param_t(pj_in.ctx, pj_in.parameters, "f")) defn+=" +f="+pj_param_s(pj_in.ctx, pj_in.parameters, "f");
else defn+=" +es="+pj_in.es.ToString("G16", nc);
}
else
{
pj_ctx_set_errno(pj_in.ctx, -13);
return null;
}
if(!got_datum)
{
if(pj_param_t(pj_in.ctx, pj_in.parameters, "towgs84")) defn+=" +towgs84="+pj_param_s(pj_in.ctx, pj_in.parameters, "towgs84");
if(pj_param_t(pj_in.ctx, pj_in.parameters, "nadgrids")) defn+=" +nadgrids="+pj_param_s(pj_in.ctx, pj_in.parameters, "nadgrids");
}
// copy over some other information related to ellipsoid
if(pj_param_t(pj_in.ctx, pj_in.parameters, "R")) defn+=" +R="+pj_param_s(pj_in.ctx, pj_in.parameters, "R");
if(pj_param_t(pj_in.ctx, pj_in.parameters, "R_A")) defn+=" +R_A";
if(pj_param_t(pj_in.ctx, pj_in.parameters, "R_V")) defn+=" +R_V";
if(pj_param_t(pj_in.ctx, pj_in.parameters, "R_a")) defn+=" +R_a";
if(pj_param_t(pj_in.ctx, pj_in.parameters, "R_lat_a")) defn+=" +R_lat_a="+pj_param_s(pj_in.ctx, pj_in.parameters, "R_lat_a");
if(pj_param_t(pj_in.ctx, pj_in.parameters, "R_lat_g")) defn+=" +R_lat_g="+pj_param_s(pj_in.ctx, pj_in.parameters, "R_lat_g");
// copy over prime meridian
if(pj_param_t(pj_in.ctx, pj_in.parameters, "pm")) defn+=" +pm="+pj_param_s(pj_in.ctx, pj_in.parameters, "pm");
return pj_init_plus_ctx(pj_in.ctx, defn);
}
// general forward projection
// forward projection entry
public static XY pj_fwd(LP lp, PJ P)
{
XY xy;
// check for forward and latitude or longitude overange
double t = Math.Abs(lp.phi) - HALFPI;
if (t > EPS12 || Math.Abs(lp.lam) > 10.0)
{
xy.x = xy.y = Libc.HUGE_VAL;
pj_ctx_set_errno(P.ctx, -14);
return(xy);
}
// proceed with projection
Libc.errno = pj_errno = 0;
P.ctx.last_errno = 0;
if (Math.Abs(t) <= EPS12)
{
lp.phi = lp.phi < 0.0?-HALFPI:HALFPI;
}
else if (P.geoc)
{
lp.phi = Math.Atan(P.rone_es * Math.Tan(lp.phi));
}
lp.lam -= P.lam0; // compute del lp.lam
if (!P.over)
{
lp.lam = adjlon(lp.lam); // adjust del longitude
}
xy = P.fwd(lp); // project
if (P.ctx.last_errno != 0)
{
xy.x = xy.y = Libc.HUGE_VAL;
}
else // adjust for major axis and easting/northings
{
xy.x = P.fr_meter * (P.a * xy.x + P.x0);
xy.y = P.fr_meter * (P.a * xy.y + P.y0);
}
if (pj_errno == 0)
{
pj_errno = Libc.errno;
}
return(xy);
}
// general forward projection
// forward projection entry
public static XY pj_fwd(LP lp, PJ P)
{
XY xy;
// check for forward and latitude or longitude overange
double t=Math.Abs(lp.phi)-HALFPI;
if(t>EPS12||Math.Abs(lp.lam)>10.0)
{
xy.x=xy.y=Libc.HUGE_VAL;
pj_ctx_set_errno(P.ctx, -14);
return xy;
}
// proceed with projection
Libc.errno=pj_errno=0;
P.ctx.last_errno=0;
if(Math.Abs(t)<=EPS12) lp.phi=lp.phi<0.0?-HALFPI:HALFPI;
else if(P.geoc) lp.phi=Math.Atan(P.rone_es*Math.Tan(lp.phi));
lp.lam-=P.lam0; // compute del lp.lam
if(!P.over) lp.lam=adjlon(lp.lam); // adjust del longitude
// Check for NULL pointer
if (P.fwd != null)
{
xy = P.fwd(lp); // project
if (P.ctx.last_errno != 0)
{
xy.x = xy.y = Libc.HUGE_VAL;
}
else // adjust for major axis and easting/northings
{
xy.x = P.fr_meter * (P.a * xy.x + P.x0);
xy.y = P.fr_meter * (P.a * xy.y + P.y0);
}
}
else
{
xy.x = xy.y = Libc.HUGE_VAL;
}
if(pj_errno==0) pj_errno=Libc.errno;
return xy;
}
0, 0, 0, 0, 0, 0, 0, 0, 1, 0}; // 40 to 49
//**********************************************************************
// pj_transform()
//
// Currently this function doesn't recognise if two projections
// are identical (to short circuit reprojection) because it is
// difficult to compare PJ structures (since there are some
// projection specific components).
//**********************************************************************
public static int pj_transform(PJ srcdefn, PJ dstdefn, ref double x, ref double y, ref double z)
{
double[] xa=new double[1];
double[] ya=new double[1];
double[] za=new double[1];
xa[0]=x;
ya[0]=y;
za[0]=z;
int ret=pj_transform(srcdefn, dstdefn, 1, 0, xa, ya, za);
x=xa[0];
y=ya[0];
z=za[0];
return ret;
}
}; // 40 to 49
//**********************************************************************
// pj_transform()
//
// Currently this function doesn't recognise if two projections
// are identical (to short circuit reprojection) because it is
// difficult to compare PJ structures (since there are some
// projection specific components).
//**********************************************************************
public static int pj_transform(PJ srcdefn, PJ dstdefn, ref double x, ref double y, ref double z)
{
double[] xa = new double[1];
double[] ya = new double[1];
double[] za = new double[1];
xa[0] = x;
ya[0] = y;
za[0] = z;
int ret = pj_transform(srcdefn, dstdefn, 1, 0, xa, ya, za);
x = xa[0];
y = ya[0];
z = za[0];
return(ret);
}
public static int pj_transform(PJ srcdefn, PJ dstdefn, double[] x, double[] y, double[] z)
{
if(x.Length==y.Length)
{
if(x.Length==z.Length)
{
int ret=pj_transform(srcdefn, dstdefn, x.Length, 0, x, y, z);
return ret;
}
else
{
throw new Exception("Coordinate Arrays had not the same length!");
}
}
else
{
throw new Exception("Coordinate Arrays had not the same length!");
}
}
// general forward projection
// forward projection entry
public static XYZ pj_fwd3d(LPZ lpz, PJ P)
{
XYZ xyz;
// check for forward and latitude or longitude overange
double t = Math.Abs(lpz.phi) - HALFPI;
if (t > EPS12 || Math.Abs(lpz.lam) > 10.0)
{
xyz.x = xyz.y = xyz.z = Libc.HUGE_VAL;
pj_ctx_set_errno(P.ctx, -14);
return xyz;
}
// proceed with projection
P.ctx.last_errno = 0;
pj_errno = 0;
Libc.errno = 0;
if (Math.Abs(t) <= EPS12) lpz.phi = lpz.phi < 0.0 ? -HALFPI : HALFPI;
else if (P.geoc) lpz.phi = Math.Atan(P.rone_es * Math.Tan(lpz.phi)); // Maybe redundant and never used.
lpz.lam -= P.lam0; // compute del lp.lam
if (!P.over) lpz.lam = adjlon(lpz.lam); // adjust del longitude
// Check for NULL pointer
if (P.fwd3d != null)
{
xyz = P.fwd3d(lpz); // project
if (P.ctx.last_errno != 0) xyz.x = xyz.y = xyz.z = Libc.HUGE_VAL;
// adjust for major axis and easting/northings
else
{
xyz.x = P.fr_meter * (P.a * xyz.x + P.x0);
xyz.y = P.fr_meter * (P.a * xyz.y + P.y0);
// z is not scaled since this handled by vto_meter outside
}
}
else
{
xyz.x = xyz.y = xyz.z = Libc.HUGE_VAL;
}
return xyz;
}
public static int pj_transform(PJ srcdefn, PJ dstdefn, double[] x, double[] y, double[] z)
{
if (x.Length == y.Length)
{
if (x.Length == z.Length)
{
int ret = pj_transform(srcdefn, dstdefn, x.Length, 0, x, y, z);
return(ret);
}
else
{
throw new Exception("Coordinate Arrays had not the same length!");
}
}
else
{
throw new Exception("Coordinate Arrays had not the same length!");
}
}
//**********************************************************************
// pj_geocentic_from_wgs84()
//**********************************************************************
static int pj_geocentric_from_wgs84(PJ defn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
if (defn.datum_type == PJD._3PARAM)
{
for (int i = 0; i < point_count; i++)
{
long io = i * point_offset;
if (x[io] == Libc.HUGE_VAL)
{
continue;
}
x[io] = x[io] - defn.datum_params[0];
y[io] = y[io] - defn.datum_params[1];
z[io] = z[io] - defn.datum_params[2];
}
}
else if (defn.datum_type == PJD._7PARAM)
{
for (int i = 0; i < point_count; i++)
{
long io = i * point_offset;
double x_tmp, y_tmp, z_tmp;
if (x[io] == Libc.HUGE_VAL)
{
continue;
}
x_tmp = (x[io] - defn.datum_params[0]) / defn.datum_params[6];
y_tmp = (y[io] - defn.datum_params[1]) / defn.datum_params[6];
z_tmp = (z[io] - defn.datum_params[2]) / defn.datum_params[6];
x[io] = x_tmp + defn.datum_params[5] * y_tmp - defn.datum_params[4] * z_tmp;
y[io] = -defn.datum_params[5] * x_tmp + y_tmp + defn.datum_params[3] * z_tmp;
z[io] = defn.datum_params[4] * x_tmp - defn.datum_params[3] * y_tmp + z_tmp;
}
}
return(0);
}
//**********************************************************************
// pj_geocentic_to_wgs84()
//**********************************************************************
static int pj_geocentric_to_wgs84(PJ defn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
if (defn.datum_type == PJD._3PARAM)
{
for (int i = 0; i < point_count; i++)
{
int io = i * point_offset;
if (x[io] == Libc.HUGE_VAL)
{
continue;
}
x[io] = x[io] + defn.datum_params[0];
y[io] = y[io] + defn.datum_params[1];
z[io] = z[io] + defn.datum_params[2];
}
}
else if (defn.datum_type == PJD._7PARAM)
{
for (int i = 0; i < point_count; i++)
{
int io = i * point_offset;
double x_out, y_out, z_out;
if (x[io] == Libc.HUGE_VAL)
{
continue;
}
x_out = defn.datum_params[6] * (x[io] - defn.datum_params[5] * y[io] + defn.datum_params[4] * z[io]) + defn.datum_params[0];
y_out = defn.datum_params[6] * (defn.datum_params[5] * x[io] + y[io] - defn.datum_params[3] * z[io]) + defn.datum_params[1];
z_out = defn.datum_params[6] * (-defn.datum_params[4] * x[io] + defn.datum_params[3] * y[io] + z[io]) + defn.datum_params[2];
x[io] = x_out;
y[io] = y_out;
z[io] = z_out;
}
}
return(0);
}
// general inverse projection
// inverse projection entry
public static LPZ pj_inv3d(XYZ xyz, PJ P)
{
LPZ lpz;
// can't do as much preliminary checking as with forward
if (xyz.x == Libc.HUGE_VAL || xyz.y == Libc.HUGE_VAL || xyz.z == Libc.HUGE_VAL)
{
lpz.lam = lpz.phi = lpz.z = Libc.HUGE_VAL;
pj_ctx_set_errno(P.ctx, -15);
return lpz;
}
Libc.errno = pj_errno = 0;
P.ctx.last_errno = 0;
xyz.x = (xyz.x * P.to_meter - P.x0) * P.ra; // descale and de-offset
xyz.y = (xyz.y * P.to_meter - P.y0) * P.ra;
// z is not scaled since that is handled by vto_meter before we get here
// Check for NULL pointer
if (P.inv3d != null)
{
lpz = P.inv3d(xyz); // inverse project
if (P.ctx.last_errno != 0) lpz.lam = lpz.phi = lpz.z = Libc.HUGE_VAL;
else
{
lpz.lam += P.lam0; // reduce from del lp.lam
if (!P.over) lpz.lam = adjlon(lpz.lam); // adjust longitude to CM
// This maybe redundant and never used
if (P.geoc && Math.Abs(Math.Abs(lpz.phi) - HALFPI) > EPS12) lpz.phi = Math.Atan(P.one_es * Math.Tan(lpz.phi));
}
}
else
{
lpz.lam = lpz.phi = lpz.z = Libc.HUGE_VAL;
}
return lpz;
}
// general inverse projection
// inverse projection entry
public static LP pj_inv(XY xy, PJ P)
{
LP lp;
// can't do as much preliminary checking as with forward
if (xy.x == Libc.HUGE_VAL || xy.y == Libc.HUGE_VAL)
{
lp.lam = lp.phi = Libc.HUGE_VAL;
pj_ctx_set_errno(P.ctx, -15);
return(lp);
}
Libc.errno = pj_errno = 0;
P.ctx.last_errno = 0;
xy.x = (xy.x * P.to_meter - P.x0) * P.ra; // descale and de-offset
xy.y = (xy.y * P.to_meter - P.y0) * P.ra;
lp = P.inv(xy); // inverse project
if (P.ctx.last_errno != 0)
{
lp.lam = lp.phi = Libc.HUGE_VAL;
}
else
{
lp.lam += P.lam0; // reduce from del lp.lam
if (!P.over)
{
lp.lam = adjlon(lp.lam); // adjust longitude to CM
}
if (P.geoc && Math.Abs(Math.Abs(lp.phi) - HALFPI) > EPS12)
{
lp.phi = Math.Atan(P.one_es * Math.Tan(lp.phi));
}
}
return(lp);
}
//**********************************************************************
// pj_compare_datums()
//
// Returns true if the two datums are identical, otherwise false
//**********************************************************************
public static bool pj_compare_datums(PJ srcdefn, PJ dstdefn)
{
if (srcdefn.datum_type != dstdefn.datum_type)
{
return(false);
}
// the tolerence for es is to ensure that GRS80 and WGS84 are considered identical
if (srcdefn.a_orig != dstdefn.a_orig || Math.Abs(srcdefn.es_orig - dstdefn.es_orig) > 0.000000000050)
{
return(false);
}
if (srcdefn.datum_type == PJD._3PARAM)
{
return(srcdefn.datum_params[0] == dstdefn.datum_params[0] &&
srcdefn.datum_params[1] == dstdefn.datum_params[1] &&
srcdefn.datum_params[2] == dstdefn.datum_params[2]);
}
if (srcdefn.datum_type == PJD._7PARAM)
{
return(srcdefn.datum_params[0] == dstdefn.datum_params[0] &&
srcdefn.datum_params[1] == dstdefn.datum_params[1] &&
srcdefn.datum_params[2] == dstdefn.datum_params[2] &&
srcdefn.datum_params[3] == dstdefn.datum_params[3] &&
srcdefn.datum_params[4] == dstdefn.datum_params[4] &&
srcdefn.datum_params[5] == dstdefn.datum_params[5] &&
srcdefn.datum_params[6] == dstdefn.datum_params[6]);
}
if (srcdefn.datum_type == PJD.GRIDSHIFT)
{
return(pj_param_s(srcdefn.ctx, srcdefn.parameters, "nadgrids") == pj_param_s(dstdefn.ctx, dstdefn.parameters, "nadgrids"));
}
return(true);
}
//**********************************************************************
// pj_geocentic_from_wgs84()
//**********************************************************************
static int pj_geocentric_from_wgs84(PJ defn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
if(defn.datum_type==PJD._3PARAM)
{
for(int i=0; i<point_count; i++)
{
long io=i*point_offset;
if(x[io]==Libc.HUGE_VAL) continue;
x[io]=x[io]-defn.datum_params[0];
y[io]=y[io]-defn.datum_params[1];
z[io]=z[io]-defn.datum_params[2];
}
}
else if(defn.datum_type==PJD._7PARAM)
{
for(int i=0; i<point_count; i++)
{
long io=i*point_offset;
double x_tmp, y_tmp, z_tmp;
if(x[io]==Libc.HUGE_VAL) continue;
x_tmp=(x[io]-defn.datum_params[0])/defn.datum_params[6];
y_tmp=(y[io]-defn.datum_params[1])/defn.datum_params[6];
z_tmp=(z[io]-defn.datum_params[2])/defn.datum_params[6];
x[io]=x_tmp+defn.datum_params[5]*y_tmp-defn.datum_params[4]*z_tmp;
y[io]=-defn.datum_params[5]*x_tmp+y_tmp+defn.datum_params[3]*z_tmp;
z[io]=defn.datum_params[4]*x_tmp-defn.datum_params[3]*y_tmp+z_tmp;
}
}
return 0;
}
//**********************************************************************
// pj_is_geocent()
//
// Returns TRUE if this coordinate system object is geocentric.
//**********************************************************************
public static bool pj_is_geocent(PJ pj)
{
return(pj != null && pj.is_geocent);
}
//**********************************************************************
// pj_latlong_from_proj()
//
// Return a PJ* definition defining the lat/long coordinate
// system on which a projection is based. If the coordinate
// system passed in is latlong, a clone of the same will be
// returned.
//**********************************************************************
public static PJ pj_latlong_from_proj(PJ pj_in)
{
string defn;
bool got_datum = false;
pj_errno = 0;
defn = "+proj=latlong";
if (pj_param_t(pj_in.ctx, pj_in.parameters, "datum"))
{
got_datum = true;
defn += " +datum=" + pj_param_s(pj_in.ctx, pj_in.parameters, "datum");
}
else if (pj_param_t(pj_in.ctx, pj_in.parameters, "ellps"))
{
defn += " +ellps=" + pj_param_s(pj_in.ctx, pj_in.parameters, "ellps");
}
else if (pj_param_t(pj_in.ctx, pj_in.parameters, "a"))
{
defn += " +a=" + pj_param_s(pj_in.ctx, pj_in.parameters, "a");
if (pj_param_t(pj_in.ctx, pj_in.parameters, "b"))
{
defn += " +b=" + pj_param_s(pj_in.ctx, pj_in.parameters, "b");
}
else if (pj_param_t(pj_in.ctx, pj_in.parameters, "es"))
{
defn += " +es=" + pj_param_s(pj_in.ctx, pj_in.parameters, "es");
}
else if (pj_param_t(pj_in.ctx, pj_in.parameters, "f"))
{
defn += " +f=" + pj_param_s(pj_in.ctx, pj_in.parameters, "f");
}
else
{
defn += " +es=" + pj_in.es.ToString("G16");
}
}
else
{
pj_ctx_set_errno(pj_in.ctx, -13);
return(null);
}
if (!got_datum)
{
if (pj_param_t(pj_in.ctx, pj_in.parameters, "towgs84"))
{
defn += " +towgs84=" + pj_param_s(pj_in.ctx, pj_in.parameters, "towgs84");
}
if (pj_param_t(pj_in.ctx, pj_in.parameters, "nadgrids"))
{
defn += " +nadgrids=" + pj_param_s(pj_in.ctx, pj_in.parameters, "nadgrids");
}
}
// copy over some other information related to ellipsoid
if (pj_param_t(pj_in.ctx, pj_in.parameters, "R"))
{
defn += " +R=" + pj_param_s(pj_in.ctx, pj_in.parameters, "R");
}
if (pj_param_t(pj_in.ctx, pj_in.parameters, "R_A"))
{
defn += " +R_A";
}
if (pj_param_t(pj_in.ctx, pj_in.parameters, "R_V"))
{
defn += " +R_V";
}
if (pj_param_t(pj_in.ctx, pj_in.parameters, "R_a"))
{
defn += " +R_a";
}
if (pj_param_t(pj_in.ctx, pj_in.parameters, "R_lat_a"))
{
defn += " +R_lat_a=" + pj_param_s(pj_in.ctx, pj_in.parameters, "R_lat_a");
}
if (pj_param_t(pj_in.ctx, pj_in.parameters, "R_lat_g"))
{
defn += " +R_lat_g=" + pj_param_s(pj_in.ctx, pj_in.parameters, "R_lat_g");
}
// copy over prime meridian
if (pj_param_t(pj_in.ctx, pj_in.parameters, "pm"))
{
defn += " +pm=" + pj_param_s(pj_in.ctx, pj_in.parameters, "pm");
}
return(pj_init_plus_ctx(pj_in.ctx, defn));
}
//**********************************************************************
// pj_datum_transform()
//
// The input should be long/lat/z coordinates in radians in the
// source datum, and the output should be long/lat/z
// coordinates in radians in the destination datum.
//**********************************************************************
public static int pj_datum_transform(PJ srcdefn, PJ dstdefn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
const double SRS_WGS84_SEMIMAJOR = 6378137.0;
const double SRS_WGS84_ESQUARED = 0.0066943799901413165;
// --------------------------------------------------------------------
// We cannot do any meaningful datum transformation if either
// the source or destination are of an unknown datum type
// (ie. only a +ellps declaration, no +datum). This is new
// behavior for PROJ 4.6.0.
// --------------------------------------------------------------------
if (srcdefn.datum_type == PJD.UNKNOWN || dstdefn.datum_type == PJD.UNKNOWN)
{
return(0);
}
// --------------------------------------------------------------------
// Short cut if the datums are identical.
// --------------------------------------------------------------------
if (pj_compare_datums(srcdefn, dstdefn))
{
return(0);
}
double src_a = srcdefn.a_orig;
double src_es = srcdefn.es_orig;
double dst_a = dstdefn.a_orig;
double dst_es = dstdefn.es_orig;
// --------------------------------------------------------------------
// Create a temporary Z array if one is not provided.
// --------------------------------------------------------------------
if (z == null)
{
z = new double[point_count * point_offset];
}
// --------------------------------------------------------------------
// If this datum requires grid shifts, then apply it to geodetic
// coordinates.
// --------------------------------------------------------------------
if (srcdefn.datum_type == PJD.GRIDSHIFT)
{
Grid.pj_apply_gridshift_2(srcdefn, false, point_count, point_offset, x, y, z);
if (srcdefn.ctx.last_errno != 0 && (srcdefn.ctx.last_errno > 0 || transient_error[-srcdefn.ctx.last_errno] == 0))
{
return(srcdefn.ctx.last_errno);
}
src_a = SRS_WGS84_SEMIMAJOR;
src_es = SRS_WGS84_ESQUARED;
}
if (dstdefn.datum_type == PJD.GRIDSHIFT)
{
dst_a = SRS_WGS84_SEMIMAJOR;
dst_es = SRS_WGS84_ESQUARED;
}
// ====================================================================
// Do we need to go through geocentric coordinates?
// ====================================================================
if (src_es != dst_es || src_a != dst_a || srcdefn.datum_type == PJD._3PARAM || srcdefn.datum_type == PJD._7PARAM ||
dstdefn.datum_type == PJD._3PARAM || dstdefn.datum_type == PJD._7PARAM)
{
// --------------------------------------------------------------------
// Convert to geocentric coordinates.
// --------------------------------------------------------------------
srcdefn.ctx.last_errno = pj_geodetic_to_geocentric(src_a, src_es, point_count, point_offset, x, y, z);
if (srcdefn.ctx.last_errno != 0 && (srcdefn.ctx.last_errno > 0 || transient_error[-srcdefn.ctx.last_errno] == 0))
{
return(srcdefn.ctx.last_errno);
}
// --------------------------------------------------------------------
// Convert between datums.
// --------------------------------------------------------------------
if (srcdefn.datum_type == PJD._3PARAM || srcdefn.datum_type == PJD._7PARAM)
{
pj_geocentric_to_wgs84(srcdefn, point_count, point_offset, x, y, z);
if (srcdefn.ctx.last_errno != 0 && (srcdefn.ctx.last_errno > 0 || transient_error[-srcdefn.ctx.last_errno] == 0))
{
return(srcdefn.ctx.last_errno);
}
}
if (dstdefn.datum_type == PJD._3PARAM || dstdefn.datum_type == PJD._7PARAM)
{
pj_geocentric_from_wgs84(dstdefn, point_count, point_offset, x, y, z);
if (dstdefn.ctx.last_errno != 0 && (dstdefn.ctx.last_errno > 0 || transient_error[-dstdefn.ctx.last_errno] == 0))
{
return(dstdefn.ctx.last_errno);
}
}
// --------------------------------------------------------------------
// Convert back to geodetic coordinates.
// --------------------------------------------------------------------
dstdefn.ctx.last_errno = pj_geocentric_to_geodetic(dst_a, dst_es, point_count, point_offset, x, y, z);
if (dstdefn.ctx.last_errno != 0 && (dstdefn.ctx.last_errno > 0 || transient_error[-dstdefn.ctx.last_errno] == 0))
{
return(dstdefn.ctx.last_errno);
}
}
// --------------------------------------------------------------------
// Apply grid shift to destination if required.
// --------------------------------------------------------------------
if (dstdefn.datum_type == PJD.GRIDSHIFT)
{
Grid.pj_apply_gridshift_2(dstdefn, true, point_count, point_offset, x, y, z);
if (dstdefn.ctx.last_errno != 0 && (dstdefn.ctx.last_errno > 0 || transient_error[-dstdefn.ctx.last_errno] == 0))
{
return(dstdefn.ctx.last_errno);
}
}
return(0);
}
//**********************************************************************
// pj_get_spheroid_defn()
//
// Fetch the internal definition of the spheroid. Note that
// you can compute "b" from eccentricity_squared as:
//
// b=a*sqrt(1-es)
//**********************************************************************
public static void pj_get_spheroid_defn(PJ defn, out double major_axis, out double eccentricity_squared)
{
major_axis=defn.a;
eccentricity_squared=defn.es;
}
//**********************************************************************
// pj_is_latlong()
//
// Returns TRUE if this coordinate system object is geographic.
//**********************************************************************
public static bool pj_is_latlong(PJ pj)
{
return pj==null||pj.is_latlong;
}
public static int pj_transform(PJ srcdefn, PJ dstdefn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
srcdefn.ctx.last_errno = 0;
dstdefn.ctx.last_errno = 0;
if (point_offset == 0)
{
point_offset = 1;
}
// --------------------------------------------------------------------
// Transform unusual input coordinate axis orientation to
// standard form if needed.
// --------------------------------------------------------------------
if (srcdefn.axis != "enu")
{
int err = pj_adjust_axis(srcdefn.ctx, srcdefn.axis, false, point_count, point_offset, x, y, z);
if (err != 0)
{
return(err);
}
}
// --------------------------------------------------------------------
// Transform Z to meters if it isn't already.
// --------------------------------------------------------------------
if (srcdefn.vto_meter != 1.0 && z != null)
{
for (int i = 0; i < point_count; i++)
{
z[point_offset * i] *= srcdefn.vto_meter;
}
}
// --------------------------------------------------------------------
// Transform geocentric source coordinates to lat/long.
// --------------------------------------------------------------------
if (srcdefn.is_geocent)
{
if (z == null)
{
pj_ctx_set_errno(pj_get_ctx(srcdefn), (int)PJD_ERR.GEOCENTRIC);
return((int)PJD_ERR.GEOCENTRIC);
}
if (srcdefn.to_meter != 1.0)
{
for (int i = 0; i < point_count; i++)
{
if (x[point_offset * i] != Libc.HUGE_VAL)
{
x[point_offset * i] *= srcdefn.to_meter;
y[point_offset * i] *= srcdefn.to_meter;
}
}
}
int err = pj_geocentric_to_geodetic(srcdefn.a_orig, srcdefn.es_orig, point_count, point_offset, x, y, z);
if (err != 0)
{
return(err);
}
}
// --------------------------------------------------------------------
// Transform source points to lat/long, if they aren't
// already.
// --------------------------------------------------------------------
else if (!srcdefn.is_latlong)
{
if (srcdefn.inv == null)
{
pj_ctx_set_errno(pj_get_ctx(srcdefn), -17);
#if DEBUG
Console.Error.WriteLine("pj_transform(): source projection not invertable");
#endif
return(-17);
}
for (int i = 0; i < point_count; i++)
{
XY projected_loc;
LP geodetic_loc;
projected_loc.x = x[point_offset * i];
projected_loc.y = y[point_offset * i];
if (projected_loc.x == Libc.HUGE_VAL)
{
continue;
}
geodetic_loc = pj_inv(projected_loc, srcdefn);
if (srcdefn.ctx.last_errno != 0)
{
if ((srcdefn.ctx.last_errno != (int)ERRORNUMBER.EDOM && srcdefn.ctx.last_errno != (int)ERRORNUMBER.ERANGE) &&
(srcdefn.ctx.last_errno > 0 || srcdefn.ctx.last_errno < -49 || point_count == 1 || transient_error[-srcdefn.ctx.last_errno] == 0))
{
return(srcdefn.ctx.last_errno);
}
geodetic_loc.lam = Libc.HUGE_VAL;
geodetic_loc.phi = Libc.HUGE_VAL;
}
x[point_offset * i] = geodetic_loc.lam;
y[point_offset * i] = geodetic_loc.phi;
}
}
// --------------------------------------------------------------------
// But if they are already lat long, adjust for the prime
// meridian if there is one in effect.
// --------------------------------------------------------------------
if (srcdefn.from_greenwich != 0.0)
{
for (int i = 0; i < point_count; i++)
{
if (x[point_offset * i] != Libc.HUGE_VAL)
{
x[point_offset * i] += srcdefn.from_greenwich;
}
}
}
// --------------------------------------------------------------------
// Do we need to translate from geoid to ellipsoidal vertical
// datum?
// --------------------------------------------------------------------
if (srcdefn.has_geoid_vgrids)
{
if (Grid.pj_apply_vgridshift(srcdefn, "geoidgrids", ref srcdefn.vgridlist_geoid, ref srcdefn.vgridlist_geoid_count, false, point_count, point_offset, x, y, z) != 0)
{
return(pj_ctx_get_errno(srcdefn.ctx));
}
}
// --------------------------------------------------------------------
// Convert datums if needed, and possible.
// --------------------------------------------------------------------
if (pj_datum_transform(srcdefn, dstdefn, point_count, point_offset, x, y, z) != 0)
{
if (srcdefn.ctx.last_errno != 0)
{
return(srcdefn.ctx.last_errno);
}
else
{
return(dstdefn.ctx.last_errno);
}
}
// --------------------------------------------------------------------
// Do we need to translate from geoid to ellipsoidal vertical
// datum?
// --------------------------------------------------------------------
if (dstdefn.has_geoid_vgrids)
{
if (Grid.pj_apply_vgridshift(dstdefn, "geoidgrids", ref dstdefn.vgridlist_geoid, ref dstdefn.vgridlist_geoid_count, true, point_count, point_offset, x, y, z) != 0)
{
return(dstdefn.ctx.last_errno);
}
}
// --------------------------------------------------------------------
// But if they are staying lat long, adjust for the prime
// meridian if there is one in effect.
// --------------------------------------------------------------------
if (dstdefn.from_greenwich != 0.0)
{
for (int i = 0; i < point_count; i++)
{
if (x[point_offset * i] != Libc.HUGE_VAL)
{
x[point_offset * i] -= dstdefn.from_greenwich;
}
}
}
// --------------------------------------------------------------------
// Transform destination latlong to geocentric if required.
// --------------------------------------------------------------------
if (dstdefn.is_geocent)
{
if (z == null)
{
pj_ctx_set_errno(dstdefn.ctx, (int)PJD_ERR.GEOCENTRIC);
return((int)PJD_ERR.GEOCENTRIC);
}
pj_geodetic_to_geocentric(dstdefn.a_orig, dstdefn.es_orig, point_count, point_offset, x, y, z);
if (dstdefn.fr_meter != 1.0)
{
for (int i = 0; i < point_count; i++)
{
if (x[point_offset * i] != Libc.HUGE_VAL)
{
x[point_offset * i] *= dstdefn.fr_meter;
y[point_offset * i] *= dstdefn.fr_meter;
}
}
}
}
// --------------------------------------------------------------------
// Transform destination points to projection coordinates, if
// desired.
// --------------------------------------------------------------------
else if (!dstdefn.is_latlong)
{
for (int i = 0; i < point_count; i++)
{
XY projected_loc;
LP geodetic_loc;
geodetic_loc.lam = x[point_offset * i];
geodetic_loc.phi = y[point_offset * i];
if (geodetic_loc.lam == Libc.HUGE_VAL)
{
continue;
}
projected_loc = pj_fwd(geodetic_loc, dstdefn);
if (dstdefn.ctx.last_errno != 0)
{
if ((dstdefn.ctx.last_errno != (int)ERRORNUMBER.EDOM && dstdefn.ctx.last_errno != (int)ERRORNUMBER.ERANGE) &&
(dstdefn.ctx.last_errno > 0 || dstdefn.ctx.last_errno < -49 || point_count == 1 || transient_error[-dstdefn.ctx.last_errno] == 0))
{
return(dstdefn.ctx.last_errno);
}
projected_loc.x = Libc.HUGE_VAL;
projected_loc.y = Libc.HUGE_VAL;
}
x[point_offset * i] = projected_loc.x;
y[point_offset * i] = projected_loc.y;
}
}
// --------------------------------------------------------------------
// If a wrapping center other than 0 is provided, rewrap around
// the suggested center (for latlong coordinate systems only).
// --------------------------------------------------------------------
else if (dstdefn.is_latlong && dstdefn.is_long_wrap_set)
{
for (int i = 0; i < point_count; i++)
{
if (x[point_offset * i] == Libc.HUGE_VAL)
{
continue;
}
while (x[point_offset * i] < dstdefn.long_wrap_center - PI)
{
x[point_offset * i] += TWOPI;
}
while (x[point_offset * i] > dstdefn.long_wrap_center + PI)
{
x[point_offset * i] -= TWOPI;
}
}
}
// --------------------------------------------------------------------
// Transform Z from meters if needed.
// --------------------------------------------------------------------
if (dstdefn.vto_meter != 1.0 && z != null)
{
for (int i = 0; i < point_count; i++)
{
z[point_offset * i] *= dstdefn.vfr_meter;
}
}
// --------------------------------------------------------------------
// Transform normalized axes into unusual output coordinate axis
// orientation if needed.
// --------------------------------------------------------------------
if (dstdefn.axis != "enu")
{
int err = pj_adjust_axis(dstdefn.ctx, dstdefn.axis, true, point_count, point_offset, x, y, z);
if (err != 0)
{
return(err);
}
}
return(0);
}
//**********************************************************************
// pj_is_latlong()
//
// Returns TRUE if this coordinate system object is geographic.
//**********************************************************************
public static bool pj_is_latlong(PJ pj)
{
return(pj == null || pj.is_latlong);
}
//**********************************************************************
// pj_datum_transform()
//
// The input should be long/lat/z coordinates in radians in the
// source datum, and the output should be long/lat/z
// coordinates in radians in the destination datum.
//**********************************************************************
public static int pj_datum_transform(PJ srcdefn, PJ dstdefn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
const double SRS_WGS84_SEMIMAJOR=6378137.0;
const double SRS_WGS84_ESQUARED=0.0066943799901413165;
// --------------------------------------------------------------------
// We cannot do any meaningful datum transformation if either
// the source or destination are of an unknown datum type
// (ie. only a +ellps declaration, no +datum). This is new
// behavior for PROJ 4.6.0.
// --------------------------------------------------------------------
if(srcdefn.datum_type==PJD.UNKNOWN||dstdefn.datum_type==PJD.UNKNOWN) return 0;
// --------------------------------------------------------------------
// Short cut if the datums are identical.
// --------------------------------------------------------------------
if(pj_compare_datums(srcdefn, dstdefn)) return 0;
double src_a=srcdefn.a_orig;
double src_es=srcdefn.es_orig;
double dst_a=dstdefn.a_orig;
double dst_es=dstdefn.es_orig;
// --------------------------------------------------------------------
// Create a temporary Z array if one is not provided.
// --------------------------------------------------------------------
if(z==null) z=new double[point_count*point_offset];
// --------------------------------------------------------------------
// If this datum requires grid shifts, then apply it to geodetic
// coordinates.
// --------------------------------------------------------------------
if(srcdefn.datum_type==PJD.GRIDSHIFT)
{
Grid.pj_apply_gridshift_2(srcdefn, false, point_count, point_offset, x, y, z);
if(srcdefn.ctx.last_errno!=0&&(srcdefn.ctx.last_errno>0||transient_error[-srcdefn.ctx.last_errno]==0)) return srcdefn.ctx.last_errno;
src_a=SRS_WGS84_SEMIMAJOR;
src_es=SRS_WGS84_ESQUARED;
}
if(dstdefn.datum_type==PJD.GRIDSHIFT)
{
dst_a=SRS_WGS84_SEMIMAJOR;
dst_es=SRS_WGS84_ESQUARED;
}
// ====================================================================
// Do we need to go through geocentric coordinates?
// ====================================================================
if(src_es!=dst_es||src_a!=dst_a||srcdefn.datum_type==PJD._3PARAM||srcdefn.datum_type==PJD._7PARAM||
dstdefn.datum_type==PJD._3PARAM||dstdefn.datum_type==PJD._7PARAM)
{
// --------------------------------------------------------------------
// Convert to geocentric coordinates.
// --------------------------------------------------------------------
srcdefn.ctx.last_errno=pj_geodetic_to_geocentric(src_a, src_es, point_count, point_offset, x, y, z);
if(srcdefn.ctx.last_errno!=0&&(srcdefn.ctx.last_errno>0||transient_error[-srcdefn.ctx.last_errno]==0)) return srcdefn.ctx.last_errno;
// --------------------------------------------------------------------
// Convert between datums.
// --------------------------------------------------------------------
if(srcdefn.datum_type==PJD._3PARAM||srcdefn.datum_type==PJD._7PARAM)
{
pj_geocentric_to_wgs84(srcdefn, point_count, point_offset, x, y, z);
if(srcdefn.ctx.last_errno!=0&&(srcdefn.ctx.last_errno>0||transient_error[-srcdefn.ctx.last_errno]==0)) return srcdefn.ctx.last_errno;
}
if(dstdefn.datum_type==PJD._3PARAM||dstdefn.datum_type==PJD._7PARAM)
{
pj_geocentric_from_wgs84(dstdefn, point_count, point_offset, x, y, z);
if(dstdefn.ctx.last_errno!=0&&(dstdefn.ctx.last_errno>0||transient_error[-dstdefn.ctx.last_errno]==0)) return dstdefn.ctx.last_errno;
}
// --------------------------------------------------------------------
// Convert back to geodetic coordinates.
// --------------------------------------------------------------------
dstdefn.ctx.last_errno=pj_geocentric_to_geodetic(dst_a, dst_es, point_count, point_offset, x, y, z);
if(dstdefn.ctx.last_errno!=0&&(dstdefn.ctx.last_errno>0||transient_error[-dstdefn.ctx.last_errno]==0)) return dstdefn.ctx.last_errno;
}
// --------------------------------------------------------------------
// Apply grid shift to destination if required.
// --------------------------------------------------------------------
if(dstdefn.datum_type==PJD.GRIDSHIFT)
{
Grid.pj_apply_gridshift_2(dstdefn, true, point_count, point_offset, x, y, z);
if(dstdefn.ctx.last_errno!=0&&(dstdefn.ctx.last_errno>0||transient_error[-dstdefn.ctx.last_errno]==0)) return dstdefn.ctx.last_errno;
}
return 0;
}
//**********************************************************************
// pj_datum_set()
//**********************************************************************
static bool pj_datum_set(projCtx ctx, List<string> pl, PJ projdef)
{
projdef.datum_type=PJD.UNKNOWN;
// --------------------------------------------------------------------
// Is there a datum definition in the parameters list? If so,
// add the defining values to the parameter list. Note that
// this will append the ellipse definition as well as the
// towgs84= and related parameters. It should also be pointed
// out that the addition is permanent rather than temporary
// like most other keyword expansion so that the ellipse
// definition will last into the pj_ell_set() function called
// after this one.
// --------------------------------------------------------------------
string name=pj_param_s(ctx, pl, "datum");
if(name!=null&&name!="")
{
string defn, ellipse_id;
if(GetDatum(name, out defn, out ellipse_id)==null) { pj_ctx_set_errno(ctx, -9); return true; }
if(ellipse_id!=null&&ellipse_id.Length>0) pl.Add(pj_mkparam("ellps="+ellipse_id));
if(defn!=null&&defn.Length>0) pl.Add(pj_mkparam(defn));
}
string nadgrids=pj_param_s(ctx, pl, "nadgrids");
string towgs84=pj_param_s(ctx, pl, "towgs84");
string catalog=pj_param_s(ctx, pl, "catalog");
// --------------------------------------------------------------------
// Check for nadgrids parameter.
// --------------------------------------------------------------------
if(!string.IsNullOrEmpty(nadgrids))
{
// We don't actually save the value separately. It will continue
// to exist in the param list for use in pj_apply_gridshift.cs
projdef.datum_type=PJD.GRIDSHIFT;
}
// --------------------------------------------------------------------
// Check for grid catalog parameter, and optional date.
// --------------------------------------------------------------------
else if(!string.IsNullOrEmpty(catalog))
{
projdef.datum_type=PJD.GRIDSHIFT;
projdef.catalog_name=catalog;
string date=pj_param_s(ctx, pl, "date");
if(!string.IsNullOrEmpty(date)) projdef.datum_date=Free.Ports.Proj4.Gridshift.Grid.pj_gc_parsedate(ctx, date);
}
// --------------------------------------------------------------------
// Check for towgs84 parameter.
// --------------------------------------------------------------------
else if(!string.IsNullOrEmpty(towgs84))
{
projdef.datum_params[0]=projdef.datum_params[1]=projdef.datum_params[2]=0;
projdef.datum_params[3]=projdef.datum_params[4]=projdef.datum_params[5]=projdef.datum_params[6]=0;
// parse out the parameters
string s=towgs84;
string[] ss=s.Split(',');
for(int i=0; i<7&&i<ss.Length; i++) projdef.datum_params[i]=double.Parse(ss[i], nc);
if(projdef.datum_params[3]!=0.0||projdef.datum_params[4]!=0.0||projdef.datum_params[5]!=0.0||projdef.datum_params[6]!=0.0)
{
projdef.datum_type=PJD._7PARAM;
// transform from arc seconds to radians
projdef.datum_params[3]*=SEC_TO_RAD;
projdef.datum_params[4]*=SEC_TO_RAD;
projdef.datum_params[5]*=SEC_TO_RAD;
// transform from parts per million to scaling factor
projdef.datum_params[6]=(projdef.datum_params[6]/1000000.0)+1;
}
else projdef.datum_type=PJD._3PARAM;
// Note that pj_init() will later switch datum_type to PJD.WGS84 if shifts are all zero, and ellipsoid is WGS84 or GRS80
}
return false;
}
//**********************************************************************
// pj_is_geocent()
//
// Returns TRUE if this coordinate system object is geocentric.
//**********************************************************************
public static bool pj_is_geocent(PJ pj)
{
return pj!=null&&pj.is_geocent;
}
//**********************************************************************
// pj_compare_datums()
//
// Returns true if the two datums are identical, otherwise false
//**********************************************************************
public static bool pj_compare_datums(PJ srcdefn, PJ dstdefn)
{
if(srcdefn.datum_type!=dstdefn.datum_type) return false;
// the tolerence for es is to ensure that GRS80 and WGS84 are considered identical
if(srcdefn.a_orig!=dstdefn.a_orig||Math.Abs(srcdefn.es_orig-dstdefn.es_orig)>0.000000000050) return false;
if(srcdefn.datum_type==PJD._3PARAM)
return (srcdefn.datum_params[0]==dstdefn.datum_params[0]&&
srcdefn.datum_params[1]==dstdefn.datum_params[1]&&
srcdefn.datum_params[2]==dstdefn.datum_params[2]);
if(srcdefn.datum_type==PJD._7PARAM)
return (srcdefn.datum_params[0]==dstdefn.datum_params[0]&&
srcdefn.datum_params[1]==dstdefn.datum_params[1]&&
srcdefn.datum_params[2]==dstdefn.datum_params[2]&&
srcdefn.datum_params[3]==dstdefn.datum_params[3]&&
srcdefn.datum_params[4]==dstdefn.datum_params[4]&&
srcdefn.datum_params[5]==dstdefn.datum_params[5]&&
srcdefn.datum_params[6]==dstdefn.datum_params[6]);
if(srcdefn.datum_type==PJD.GRIDSHIFT)
return pj_param_s(srcdefn.ctx, srcdefn.parameters, "nadgrids")==pj_param_s(dstdefn.ctx, dstdefn.parameters, "nadgrids");
return true;
}
//**********************************************************************
// pj_datum_set()
//**********************************************************************
static bool pj_datum_set(projCtx ctx, List <string> pl, PJ projdef)
{
projdef.datum_type = PJD.UNKNOWN;
// --------------------------------------------------------------------
// Is there a datum definition in the parameters list? If so,
// add the defining values to the parameter list. Note that
// this will append the ellipse definition as well as the
// towgs84= and related parameters. It should also be pointed
// out that the addition is permanent rather than temporary
// like most other keyword expansion so that the ellipse
// definition will last into the pj_ell_set() function called
// after this one.
// --------------------------------------------------------------------
string name = pj_param_s(ctx, pl, "datum");
if (name != null && name != "")
{
string defn, ellipse_id;
if (GetDatum(name, out defn, out ellipse_id) == null)
{
pj_ctx_set_errno(ctx, -9); return(true);
}
if (ellipse_id != null && ellipse_id.Length > 0)
{
pl.Add(pj_mkparam("ellps=" + ellipse_id));
}
if (defn != null && defn.Length > 0)
{
pl.Add(pj_mkparam(defn));
}
}
string nadgrids = pj_param_s(ctx, pl, "nadgrids");
string towgs84 = pj_param_s(ctx, pl, "towgs84");
string catalog = pj_param_s(ctx, pl, "catalog");
// --------------------------------------------------------------------
// Check for nadgrids parameter.
// --------------------------------------------------------------------
if (!string.IsNullOrEmpty(nadgrids))
{
// We don't actually save the value separately. It will continue
// to exist in the param list for use in pj_apply_gridshift.cs
projdef.datum_type = PJD.GRIDSHIFT;
}
// --------------------------------------------------------------------
// Check for grid catalog parameter, and optional date.
// --------------------------------------------------------------------
else if (!string.IsNullOrEmpty(catalog))
{
projdef.datum_type = PJD.GRIDSHIFT;
projdef.catalog_name = catalog;
string date = pj_param_s(ctx, pl, "date");
if (!string.IsNullOrEmpty(date))
{
projdef.datum_date = Free.Ports.Proj4.Gridshift.Grid.pj_gc_parsedate(ctx, date);
}
}
// --------------------------------------------------------------------
// Check for towgs84 parameter.
// --------------------------------------------------------------------
else if (!string.IsNullOrEmpty(towgs84))
{
projdef.datum_params[0] = projdef.datum_params[1] = projdef.datum_params[2] = 0;
projdef.datum_params[3] = projdef.datum_params[4] = projdef.datum_params[5] = projdef.datum_params[6] = 0;
// parse out the parameters
string s = towgs84;
string[] ss = s.Split(',');
for (int i = 0; i < 7 && i < ss.Length; i++)
{
projdef.datum_params[i] = double.Parse(ss[i], nc);
}
if (projdef.datum_params[3] != 0.0 || projdef.datum_params[4] != 0.0 || projdef.datum_params[5] != 0.0 || projdef.datum_params[6] != 0.0)
{
projdef.datum_type = PJD._7PARAM;
// transform from arc seconds to radians
projdef.datum_params[3] *= SEC_TO_RAD;
projdef.datum_params[4] *= SEC_TO_RAD;
projdef.datum_params[5] *= SEC_TO_RAD;
// transform from parts per million to scaling factor
projdef.datum_params[6] = (projdef.datum_params[6] / 1000000.0) + 1;
}
else
{
projdef.datum_type = PJD._3PARAM;
}
// Note that pj_init() will later switch datum_type to PJD.WGS84 if shifts are all zero, and ellipsoid is WGS84 or GRS80
}
return(false);
}
public static int pj_transform(PJ srcdefn, PJ dstdefn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
srcdefn.ctx.last_errno=0;
dstdefn.ctx.last_errno=0;
if(point_offset==0) point_offset=1;
// --------------------------------------------------------------------
// Transform unusual input coordinate axis orientation to
// standard form if needed.
// --------------------------------------------------------------------
if(srcdefn.axis!="enu")
{
int err=pj_adjust_axis(srcdefn.ctx, srcdefn.axis, false, point_count, point_offset, x, y, z);
if(err!=0) return err;
}
// --------------------------------------------------------------------
// Transform Z to meters if it isn't already.
// --------------------------------------------------------------------
if(srcdefn.vto_meter!=1.0&&z!=null)
{
for(int i=0; i<point_count; i++) z[point_offset*i]*=srcdefn.vto_meter;
}
// --------------------------------------------------------------------
// Transform geocentric source coordinates to lat/long.
// --------------------------------------------------------------------
if(srcdefn.is_geocent)
{
if(z==null)
{
pj_ctx_set_errno(pj_get_ctx(srcdefn), (int)PJD_ERR.GEOCENTRIC);
return (int)PJD_ERR.GEOCENTRIC;
}
if(srcdefn.to_meter!=1.0)
{
for(int i=0; i<point_count; i++)
{
if(x[point_offset*i]!=Libc.HUGE_VAL)
{
x[point_offset*i]*=srcdefn.to_meter;
y[point_offset*i]*=srcdefn.to_meter;
}
}
}
int err=pj_geocentric_to_geodetic(srcdefn.a_orig, srcdefn.es_orig, point_count, point_offset, x, y, z);
if(err!=0) return err;
}
// --------------------------------------------------------------------
// Transform source points to lat/long, if they aren't
// already.
// --------------------------------------------------------------------
else if(!srcdefn.is_latlong)
{
if(srcdefn.inv==null)
{
pj_ctx_set_errno(pj_get_ctx(srcdefn), -17);
#if DEBUG
Console.Error.WriteLine("pj_transform(): source projection not invertable");
#endif
return -17;
}
for(int i=0; i<point_count; i++)
{
XY projected_loc;
LP geodetic_loc;
projected_loc.x=x[point_offset*i];
projected_loc.y=y[point_offset*i];
if(projected_loc.x==Libc.HUGE_VAL) continue;
geodetic_loc=pj_inv(projected_loc, srcdefn);
if(srcdefn.ctx.last_errno!=0)
{
if((srcdefn.ctx.last_errno!=(int)ERRORNUMBER.EDOM&&srcdefn.ctx.last_errno!=(int)ERRORNUMBER.ERANGE)&&
(srcdefn.ctx.last_errno>0||srcdefn.ctx.last_errno<-49||point_count==1||transient_error[-srcdefn.ctx.last_errno]==0))
return srcdefn.ctx.last_errno;
geodetic_loc.lam=Libc.HUGE_VAL;
geodetic_loc.phi=Libc.HUGE_VAL;
}
x[point_offset*i]=geodetic_loc.lam;
y[point_offset*i]=geodetic_loc.phi;
}
}
// --------------------------------------------------------------------
// But if they are already lat long, adjust for the prime
// meridian if there is one in effect.
// --------------------------------------------------------------------
if(srcdefn.from_greenwich!=0.0)
{
for(int i=0; i<point_count; i++)
{
if(x[point_offset*i]!=Libc.HUGE_VAL) x[point_offset*i]+=srcdefn.from_greenwich;
}
}
// --------------------------------------------------------------------
// Do we need to translate from geoid to ellipsoidal vertical
// datum?
// --------------------------------------------------------------------
if(srcdefn.has_geoid_vgrids)
{
if(Grid.pj_apply_vgridshift(srcdefn, "geoidgrids", ref srcdefn.vgridlist_geoid, ref srcdefn.vgridlist_geoid_count, false, point_count, point_offset, x, y, z)!=0)
return pj_ctx_get_errno(srcdefn.ctx);
}
// --------------------------------------------------------------------
// Convert datums if needed, and possible.
// --------------------------------------------------------------------
if(pj_datum_transform(srcdefn, dstdefn, point_count, point_offset, x, y, z)!=0)
{
if(srcdefn.ctx.last_errno!=0) return srcdefn.ctx.last_errno;
else return dstdefn.ctx.last_errno;
}
// --------------------------------------------------------------------
// Do we need to translate from geoid to ellipsoidal vertical
// datum?
// --------------------------------------------------------------------
if(dstdefn.has_geoid_vgrids)
{
if(Grid.pj_apply_vgridshift(dstdefn, "geoidgrids", ref dstdefn.vgridlist_geoid, ref dstdefn.vgridlist_geoid_count, true, point_count, point_offset, x, y, z)!=0)
return dstdefn.ctx.last_errno;
}
// --------------------------------------------------------------------
// But if they are staying lat long, adjust for the prime
// meridian if there is one in effect.
// --------------------------------------------------------------------
if(dstdefn.from_greenwich!=0.0)
{
for(int i=0; i<point_count; i++)
{
if(x[point_offset*i]!=Libc.HUGE_VAL)
x[point_offset*i]-=dstdefn.from_greenwich;
}
}
// --------------------------------------------------------------------
// Transform destination latlong to geocentric if required.
// --------------------------------------------------------------------
if(dstdefn.is_geocent)
{
if(z==null)
{
pj_ctx_set_errno(dstdefn.ctx, (int)PJD_ERR.GEOCENTRIC);
return (int)PJD_ERR.GEOCENTRIC;
}
pj_geodetic_to_geocentric(dstdefn.a_orig, dstdefn.es_orig, point_count, point_offset, x, y, z);
if(dstdefn.fr_meter!=1.0)
{
for(int i=0; i<point_count; i++)
{
if(x[point_offset*i]!=Libc.HUGE_VAL)
{
x[point_offset*i]*=dstdefn.fr_meter;
y[point_offset*i]*=dstdefn.fr_meter;
}
}
}
}
// --------------------------------------------------------------------
// Transform destination points to projection coordinates, if
// desired.
// --------------------------------------------------------------------
else if(!dstdefn.is_latlong)
{
for(int i=0; i<point_count; i++)
{
XY projected_loc;
LP geodetic_loc;
geodetic_loc.lam=x[point_offset*i];
geodetic_loc.phi=y[point_offset*i];
if(geodetic_loc.lam==Libc.HUGE_VAL) continue;
projected_loc=pj_fwd(geodetic_loc, dstdefn);
if(dstdefn.ctx.last_errno!=0)
{
if((dstdefn.ctx.last_errno!=(int)ERRORNUMBER.EDOM&&dstdefn.ctx.last_errno!=(int)ERRORNUMBER.ERANGE)&&
(dstdefn.ctx.last_errno>0||dstdefn.ctx.last_errno<-49||point_count==1||transient_error[-dstdefn.ctx.last_errno]==0))
return dstdefn.ctx.last_errno;
projected_loc.x=Libc.HUGE_VAL;
projected_loc.y=Libc.HUGE_VAL;
}
x[point_offset*i]=projected_loc.x;
y[point_offset*i]=projected_loc.y;
}
}
// --------------------------------------------------------------------
// If a wrapping center other than 0 is provided, rewrap around
// the suggested center (for latlong coordinate systems only).
// --------------------------------------------------------------------
else if(dstdefn.is_latlong&&dstdefn.is_long_wrap_set)
{
for(int i=0; i<point_count; i++)
{
if(x[point_offset*i]==Libc.HUGE_VAL) continue;
while(x[point_offset*i]<dstdefn.long_wrap_center-PI) x[point_offset*i]+=TWOPI;
while(x[point_offset*i]>dstdefn.long_wrap_center+PI) x[point_offset*i]-=TWOPI;
}
}
// --------------------------------------------------------------------
// Transform Z from meters if needed.
// --------------------------------------------------------------------
if(dstdefn.vto_meter!=1.0&&z!=null)
{
for(int i=0; i<point_count; i++) z[point_offset*i]*=dstdefn.vfr_meter;
}
// --------------------------------------------------------------------
// Transform normalized axes into unusual output coordinate axis
// orientation if needed.
// --------------------------------------------------------------------
if(dstdefn.axis!="enu")
{
int err=pj_adjust_axis(dstdefn.ctx, dstdefn.axis, true, point_count, point_offset, x, y, z);
if(err!=0) return err;
}
return 0;
}
//**********************************************************************
// pj_get_spheroid_defn()
//
// Fetch the internal definition of the spheroid. Note that
// you can compute "b" from eccentricity_squared as:
//
// b=a*sqrt(1-es)
//**********************************************************************
public static void pj_get_spheroid_defn(PJ defn, out double major_axis, out double eccentricity_squared)
{
major_axis = defn.a;
eccentricity_squared = defn.es;
}
//**********************************************************************
// pj_geocentic_to_wgs84()
//**********************************************************************
static int pj_geocentric_to_wgs84(PJ defn, int point_count, int point_offset, double[] x, double[] y, double[] z)
{
if(defn.datum_type==PJD._3PARAM)
{
for(int i=0; i<point_count; i++)
{
int io=i*point_offset;
if(x[io]==Libc.HUGE_VAL) continue;
x[io]=x[io]+defn.datum_params[0];
y[io]=y[io]+defn.datum_params[1];
z[io]=z[io]+defn.datum_params[2];
}
}
else if(defn.datum_type==PJD._7PARAM)
{
for(int i=0; i<point_count; i++)
{
int io=i*point_offset;
double x_out, y_out, z_out;
if(x[io]==Libc.HUGE_VAL) continue;
x_out=defn.datum_params[6]*(x[io]-defn.datum_params[5]*y[io]+defn.datum_params[4]*z[io])+defn.datum_params[0];
y_out=defn.datum_params[6]*(defn.datum_params[5]*x[io]+y[io]-defn.datum_params[3]*z[io])+defn.datum_params[1];
z_out=defn.datum_params[6]*(-defn.datum_params[4]*x[io]+defn.datum_params[3]*y[io]+z[io])+defn.datum_params[2];
x[io]=x_out;
y[io]=y_out;
z[io]=z_out;
}
}
return 0;
}
public static PJ pj_init_ctx(projCtx ctx, string[] argv)
{
ctx.last_errno = 0;
if (argv.Length <= 0)
{
pj_ctx_set_errno(ctx, -1); return(null);
}
List <string> start = new List <string>();
Libc.errno = pj_errno = 0;
// put arguments into internal linked list
for (int a = 0; a < argv.Length; a++)
{
string curr = pj_mkparam(argv[a]);
if (curr == null)
{
pj_ctx_set_errno(ctx, Libc.errno); return(null);
}
start.Add(curr);
}
// check if +init present
if (pj_param_t(ctx, start, "init"))
{
bool found_def;
string curr = get_init(ctx, start, pj_param_s(ctx, start, "init"), out found_def);
if (curr == null || !found_def)
{
if (pj_errno != 0 || Libc.errno != 0)
{
if (pj_errno == 0)
{
pj_ctx_set_errno(ctx, Libc.errno);
}
}
else
{
pj_ctx_set_errno(ctx, -2);
}
return(null);
}
}
// find projection selection
string name = pj_param_s(ctx, start, "proj");
if (name == "")
{
pj_ctx_set_errno(ctx, -4); return(null);
}
// set defaults, unless inhibited
if (!pj_param_b(ctx, start, "no_defs"))
{
get_defaults(ctx, start, name);
}
// allocate projection structure
PJ PIN = GetPJ(name);
if (PIN == null)
{
pj_ctx_set_errno(ctx, -5); return(null);
}
PIN.ctx = ctx;
PIN.parameters = start;
PIN.is_latlong = false;
PIN.is_geocent = false;
PIN.is_long_wrap_set = false;
PIN.long_wrap_center = 0.0;
PIN.axis = "enu";
PIN.gridlist = null;
PIN.vgridlist_geoid = null;
// set datum parameters
if (pj_datum_set(ctx, start, PIN))
{
return(null);
}
// set ellipsoid/sphere parameters
if (pj_ell_set(ctx, start, out PIN.a, out PIN.es))
{
return(null);
}
PIN.a_orig = PIN.a;
PIN.es_orig = PIN.es;
PIN.e = Math.Sqrt(PIN.es);
PIN.ra = 1.0 / PIN.a;
PIN.one_es = 1.0 - PIN.es;
if (PIN.one_es == 0.0)
{
pj_ctx_set_errno(ctx, -6); return(null);
}
PIN.rone_es = 1.0 / PIN.one_es;
// Now that we have ellipse information check for WGS84 datum
if (PIN.datum_type == PJD._3PARAM && PIN.datum_params[0] == 0.0 && PIN.datum_params[1] == 0.0 && PIN.datum_params[2] == 0.0 &&
PIN.a == 6378137.0 && Math.Abs(PIN.es - 0.006694379990) < 0.000000000050)
{
PIN.datum_type = PJD.WGS84; //WGS84/GRS80
}
// set PIN.geoc coordinate system
PIN.geoc = PIN.es != 0.0 && pj_param_b(ctx, start, "geoc");
// over-ranging flag
PIN.over = pj_param_b(ctx, start, "over");
// vertical datum geoid grids
PIN.has_geoid_vgrids = pj_param_t(ctx, start, "geoidgrids");
if (PIN.has_geoid_vgrids) // we need to mark it as used.
{
pj_param_s(ctx, start, "geoidgrids");
}
// longitude center for wrapping
PIN.is_long_wrap_set = pj_param_b(ctx, start, "lon_wrap");
if (PIN.is_long_wrap_set)
{
PIN.long_wrap_center = pj_param_r(ctx, start, "lon_wrap");
}
// axis orientation
string axis_arg = pj_param_s(ctx, start, "axis");
if (axis_arg != null && axis_arg.Length != 0)
{
string axis_legal = "ewnsud";
if (axis_arg.Length != 3)
{
pj_ctx_set_errno(ctx, (int)PJD_ERR.AXIS);
return(null);
}
if (axis_legal.IndexOf(axis_arg[0]) == -1 || axis_legal.IndexOf(axis_arg[1]) == -1 || (axis_arg.Length >= 3 && axis_legal.IndexOf(axis_arg[2]) == -1))
{
pj_ctx_set_errno(ctx, (int)PJD_ERR.AXIS);
return(null);
}
// it would be nice to validate we don't have on axis repeated
PIN.axis = axis_arg;
}
// central meridian
PIN.lam0 = pj_param_r(ctx, start, "lon_0");
// central latitude
PIN.phi0 = pj_param_r(ctx, start, "lat_0");
// false easting and northing
PIN.x0 = pj_param_d(ctx, start, "x_0");
PIN.y0 = pj_param_d(ctx, start, "y_0");
// general scaling factor
if (pj_param_t(ctx, start, "k_0"))
{
PIN.k0 = pj_param_d(ctx, start, "k_0");
}
else if (pj_param_t(ctx, start, "k"))
{
PIN.k0 = pj_param_d(ctx, start, "k");
}
else
{
PIN.k0 = 1.0;
}
if (PIN.k0 <= 0.0)
{
pj_ctx_set_errno(ctx, -31); return(null);
}
// set units
double to_meter = double.NaN;
name = pj_param_s(ctx, start, "units");
if (name != "")
{
to_meter = GetUnitFactor(name);
if (double.IsNaN(to_meter))
{
pj_ctx_set_errno(ctx, -7); return(null);
}
PIN.to_meter = to_meter;
}
if (double.IsNaN(to_meter))
{
string s = pj_param_s(ctx, start, "to_meter");
if (s != "")
{
PIN.to_meter = Libc.strtod(s, out s);
if (s.Length > 0 && s[0] == '/')
{
PIN.to_meter /= Libc.strtod(s.Substring(1), out s); // ratio number
}
PIN.fr_meter = 1.0 / PIN.to_meter;
}
else
{
PIN.to_meter = PIN.fr_meter = 1.0;
}
}
else
{
PIN.fr_meter = 1.0 / PIN.to_meter;
}
// set vertical units
double vto_meter = double.NaN;
name = pj_param_s(ctx, start, "vunits");
if (name != "")
{
vto_meter = GetUnitFactor(name);
if (double.IsNaN(vto_meter))
{
pj_ctx_set_errno(ctx, -7); return(null);
}
PIN.vto_meter = vto_meter;
}
if (double.IsNaN(vto_meter))
{
string s = pj_param_s(ctx, start, "vto_meter");
if (s != "")
{
PIN.vto_meter = Libc.strtod(s, out s);
if (s.Length > 0 && s[0] == '/')
{
PIN.vto_meter /= Libc.strtod(s.Substring(1), out s); // ratio number
}
PIN.vfr_meter = 1.0 / PIN.vto_meter;
}
else
{
PIN.vto_meter = PIN.to_meter;
PIN.vfr_meter = PIN.fr_meter;
}
}
else
{
PIN.vfr_meter = 1.0 / PIN.vto_meter;
}
// prime meridian
name = pj_param_s(ctx, start, "pm");
if (name != "")
{
string value = GetPrimeMeridian(name);
string next_str;
if (value == null)
{
double tmp = dmstor_ctx(ctx, name, out next_str);
if ((tmp != 0.0 || name[0] == '0') && next_str == "")
{
value = name;
}
}
if (value == null)
{
pj_ctx_set_errno(ctx, -46); return(null);
}
PIN.from_greenwich = dmstor_ctx(ctx, value, out next_str);
}
else
{
PIN.from_greenwich = 0.0;
}
// projection specific initialization
PIN = PIN.Init();
if (PIN == null || ctx.last_errno != 0)
{
// cleanup error return
return(null);
}
return(PIN);
}
