private static void DatumTransform(ProjectionInfo source, ProjectionInfo dest, double[] xy, double[] z, int startIndex, int numPoints)
{
Spheroid wgs84 = new Spheroid(Proj4Ellipsoid.WGS_1984);
Datum sDatum = source.GeographicInfo.Datum;
Datum dDatum = dest.GeographicInfo.Datum;
/* -------------------------------------------------------------------- */
/* 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 (sDatum.DatumType == DatumType.Unknown ||
dDatum.DatumType == DatumType.Unknown) return;
/* -------------------------------------------------------------------- */
/* Short cut if the datums are identical. */
/* -------------------------------------------------------------------- */
if (sDatum.Matches(dDatum)) return;
// proj4 actually allows some tollerance here
if (sDatum.DatumType == dDatum.DatumType)
{
if (sDatum.Spheroid.EquatorialRadius == dDatum.Spheroid.EquatorialRadius)
{
if (Math.Abs(sDatum.Spheroid.EccentricitySquared() - dDatum.Spheroid.EccentricitySquared()) < 0.000000000050)
{
// The tolerence is to allow GRS80 and WGS84 to escape without being transformed at all.
return;
}
}
}
double srcA = sDatum.Spheroid.EquatorialRadius;
double srcEs = sDatum.Spheroid.EccentricitySquared();
double dstA = dDatum.Spheroid.EquatorialRadius;
double dstEs = dDatum.Spheroid.EccentricitySquared();
/* -------------------------------------------------------------------- */
/* Create a temporary Z value if one is not provided. */
/* -------------------------------------------------------------------- */
if (z == null)
{
z = new double[xy.Length / 2];
}
/* -------------------------------------------------------------------- */
/* If this datum requires grid shifts, then apply it to geodetic */
/* coordinates. */
/* -------------------------------------------------------------------- */
if (sDatum.DatumType == DatumType.GridShift)
{
// pj_apply_gridshift(pj_param(srcdefn->params,"snadgrids").s, 0,
// point_count, point_offset, x, y, z );
GridShift.Apply(source.GeographicInfo.Datum.NadGrids, false, xy, startIndex, numPoints);
srcA = wgs84.EquatorialRadius;
srcEs = wgs84.EccentricitySquared();
}
if (dDatum.DatumType == DatumType.GridShift)
{
dstA = wgs84.EquatorialRadius;
dstEs = wgs84.EccentricitySquared();
}
/* ==================================================================== */
/* Do we need to go through geocentric coordinates? */
/* ==================================================================== */
if (srcEs != dstEs || srcA != dstA
|| sDatum.DatumType == DatumType.Param3
|| sDatum.DatumType == DatumType.Param7
|| dDatum.DatumType == DatumType.Param3
|| dDatum.DatumType == DatumType.Param7)
{
/* -------------------------------------------------------------------- */
/* Convert to geocentric coordinates. */
/* -------------------------------------------------------------------- */
GeocentricGeodetic gc = new GeocentricGeodetic(sDatum.Spheroid);
gc.GeodeticToGeocentric(xy, z, startIndex, numPoints);
/* -------------------------------------------------------------------- */
/* Convert between datums. */
/* -------------------------------------------------------------------- */
if (sDatum.DatumType == DatumType.Param3 || sDatum.DatumType == DatumType.Param7)
{
PjGeocentricToWgs84(source, xy, z, startIndex, numPoints);
}
if (dDatum.DatumType == DatumType.Param3 || dDatum.DatumType == DatumType.Param7)
{
PjGeocentricFromWgs84(dest, xy, z, startIndex, numPoints);
}
/* -------------------------------------------------------------------- */
/* Convert back to geodetic coordinates. */
/* -------------------------------------------------------------------- */
gc = new GeocentricGeodetic(dDatum.Spheroid);
gc.GeocentricToGeodetic(xy, z, startIndex, numPoints);
}
/* -------------------------------------------------------------------- */
/* Apply grid shift to destination if required. */
/* -------------------------------------------------------------------- */
if (dDatum.DatumType == DatumType.GridShift)
{
// pj_apply_gridshift(pj_param(dstdefn->params,"snadgrids").s, 1,
// point_count, point_offset, x, y, z );
GridShift.Apply(dest.GeographicInfo.Datum.NadGrids, true, xy, startIndex, numPoints);
}
}
/// <summary>
/// datum tranform method
/// </summary>
/// <param name="source"></param>
/// <param name="dest"></param>
/// <param name="xy"></param>
/// <param name="z"></param>
/// <param name="startIndex"></param>
/// <param name="numPoints"></param>
public void Transform(ProjectionInfo source, ProjectionInfo dest, double[] xy, double[] z, int startIndex, int numPoints)
{
if (_aiDts.Length == 0)
{
return; // "empty" datum transform
}
bool bCoordsAreGeocentric = false;
/* -------------------------------------------------------------------- */
/* Create a temporary Z value if one is not provided. */
/* -------------------------------------------------------------------- */
if (z == null)
{
z = new double[xy.Length / 2];
}
foreach (IDatumTransformStage idts in _aiDts)
{
if (idts.Method == TransformMethod.GridShift)
{
if (bCoordsAreGeocentric)
{
var gc = new GeocentricGeodetic(idts.FromSpheroid);
gc.GeocentricToGeodetic(xy, z, startIndex, numPoints);
bCoordsAreGeocentric = false;
}
var astrGrids = new string[1];
astrGrids[0] = "@" + idts.GridShiftTable;
GridShift.Apply(astrGrids, idts.ApplyTableInverse, xy, startIndex, numPoints);
}
else
{
if (!bCoordsAreGeocentric)
{
var gc = new GeocentricGeodetic(idts.FromSpheroid);
gc.GeodeticToGeocentric(xy, z, startIndex, numPoints);
bCoordsAreGeocentric = true;
}
ApplyParameterizedTransform(idts, xy, z, startIndex, numPoints);
}
}
/* -------------------------------------------------------------------- */
/* Convert back to geodetic coordinates, if needed. */
/* -------------------------------------------------------------------- */
if (bCoordsAreGeocentric)
{
var gc = new GeocentricGeodetic(_aiDts[_aiDts.Length - 1].ToSpheroid);
gc.GeocentricToGeodetic(xy, z, startIndex, numPoints);
}
}
/// <summary>
///
/// </summary>
/// <param name="xy">The xy array should be in interleaved set of xy coordinates like [x1, y1, x2, y2, ... xn, yn]</param>
/// <param name="z">The z array is the array of all the z values</param>
/// <param name="source"></param>
/// <param name="srcZtoMeter"></param>
/// <param name="dest"></param>
/// <param name="dstZtoMeter"></param>
/// <param name="idt"></param>
/// <param name="startIndex"></param>
/// <param name="numPoints"></param>
public static void ReprojectPoints(double[] xy, double[] z, ProjectionInfo source, double srcZtoMeter, ProjectionInfo dest, double dstZtoMeter, IDatumTransform idt, int startIndex, int numPoints)
{
double toMeter = source.Unit.Meters;
// Geocentric coordinates are centered at the core of the earth. Z is up toward the north pole.
// The X axis goes from the center of the earth through Greenwich.
// The Y axis passes through 90E.
// This section converts from geocentric coordinates to geodetic ones if necessary.
if (source.IsGeocentric)
{
if (z == null)
{
throw new ProjectionException(45);
}
for (int i = startIndex; i < numPoints; i++)
{
if (toMeter != 1)
{
xy[i * 2] *= toMeter;
xy[i * 2 + 1] *= toMeter;
}
}
GeocentricGeodetic g = new GeocentricGeodetic(source.GeographicInfo.Datum.Spheroid);
g.GeocentricToGeodetic(xy, z, startIndex, numPoints);
}
// Transform source points to lam/phi if they are not already
ConvertToLatLon(source, xy, z, srcZtoMeter, startIndex, numPoints);
double fromGreenwich = source.GeographicInfo.Meridian.Longitude * source.GeographicInfo.Unit.Radians;
if (fromGreenwich != 0)
{
for (int i = startIndex; i < numPoints; i++)
{
if (xy[2 * i] != double.PositiveInfinity)
xy[2 * i] += fromGreenwich;
}
}
// DATUM TRANSFORM IF NEEDED
if (idt == null)
{
if (!source.GeographicInfo.Datum.Matches(dest.GeographicInfo.Datum))
{
DatumTransform(source, dest, xy, z, startIndex, numPoints);
}
}
else
{
idt.Transform(source, dest, xy, z, startIndex, numPoints);
}
// Adjust to new prime meridian if there is one in the destination cs
fromGreenwich = dest.GeographicInfo.Meridian.Longitude * dest.GeographicInfo.Unit.Radians;
if (fromGreenwich != 0)
{
for (int i = startIndex; i < numPoints; i++)
{
if (xy[i * 2] != double.PositiveInfinity)
{
xy[i * 2] -= fromGreenwich;
}
}
}
if (dest.IsGeocentric)
{
if (z == null)
{
throw new ProjectionException(45);
}
GeocentricGeodetic g = new GeocentricGeodetic(dest.GeographicInfo.Datum.Spheroid);
g.GeodeticToGeocentric(xy, z, startIndex, numPoints);
double frmMeter = 1 / dest.Unit.Meters;
if (frmMeter != 1)
{
for (int i = startIndex; i < numPoints; i++)
{
if (xy[i * 2] != double.PositiveInfinity)
{
xy[i * 2] *= frmMeter;
xy[i * 2 + 1] *= frmMeter;
}
}
}
}
else
{
ConvertToProjected(dest, xy, z, dstZtoMeter, startIndex, numPoints);
}
}
public static void ReprojectPoints(double[] xy, double[] z, ProjectionInfo source, double srcZtoMeter, ProjectionInfo dest, double dstZtoMeter, IDatumTransform idt, int startIndex, int numPoints)
{
double toMeter = source.Unit.Meters;
// Geocentric coordinates are centered at the core of the earth. Z is up toward the north pole.
// The X axis goes from the center of the earth through Greenwich.
// The Y axis passes through 90E.
// This section converts from geocentric coordinates to geodetic ones if necessary.
if (source.IsGeocentric)
{
if (z == null)
{
throw new ProjectionException(45);
}
for (int i = startIndex; i < numPoints; i++)
{
if (toMeter != 1)
{
xy[i * 2] *= toMeter;
xy[i * 2 + 1] *= toMeter;
}
}
GeocentricGeodetic g = new GeocentricGeodetic(source.GeographicInfo.Datum.Spheroid);
g.GeocentricToGeodetic(xy, z, startIndex, numPoints);
}
// Transform source points to lam/phi if they are not already
ConvertToLatLon(source, xy, z, srcZtoMeter, startIndex, numPoints);
double fromGreenwich = source.GeographicInfo.Meridian.Longitude * source.GeographicInfo.Unit.Radians;
if (fromGreenwich != 0)
{
for (int i = startIndex; i < numPoints; i++)
{
if (xy[2 * i] != double.PositiveInfinity)
{
xy[2 * i] += fromGreenwich;
}
}
}
// DATUM TRANSFORM IF NEEDED
if (idt == null)
{
if (!source.GeographicInfo.Datum.Matches(dest.GeographicInfo.Datum))
{
DatumTransform(source, dest, xy, z, startIndex, numPoints);
}
}
else
{
idt.Transform(source, dest, xy, z, startIndex, numPoints);
}
// Adjust to new prime meridian if there is one in the destination cs
fromGreenwich = dest.GeographicInfo.Meridian.Longitude * dest.GeographicInfo.Unit.Radians;
if (fromGreenwich != 0)
{
for (int i = startIndex; i < numPoints; i++)
{
if (xy[i * 2] != double.PositiveInfinity)
{
xy[i * 2] -= fromGreenwich;
}
}
}
if (dest.IsGeocentric)
{
if (z == null)
{
throw new ProjectionException(45);
}
GeocentricGeodetic g = new GeocentricGeodetic(dest.GeographicInfo.Datum.Spheroid);
g.GeodeticToGeocentric(xy, z, startIndex, numPoints);
double frmMeter = 1 / dest.Unit.Meters;
if (frmMeter != 1)
{
for (int i = startIndex; i < numPoints; i++)
{
if (xy[i * 2] != double.PositiveInfinity)
{
xy[i * 2] *= frmMeter;
xy[i * 2 + 1] *= frmMeter;
}
}
}
}
else
{
ConvertToProjected(dest, xy, z, dstZtoMeter, startIndex, numPoints);
}
}
private static void DatumTransform(ProjectionInfo source, ProjectionInfo dest, double[] xy, double[] z, int startIndex, int numPoints)
{
Spheroid wgs84 = new Spheroid(Proj4Ellipsoid.WGS_1984);
Datum sDatum = source.GeographicInfo.Datum;
Datum dDatum = dest.GeographicInfo.Datum;
/* -------------------------------------------------------------------- */
/* 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 (sDatum.DatumType == DatumType.Unknown ||
dDatum.DatumType == DatumType.Unknown)
{
return;
}
/* -------------------------------------------------------------------- */
/* Short cut if the datums are identical. */
/* -------------------------------------------------------------------- */
if (sDatum.Matches(dDatum))
{
return;
}
// proj4 actually allows some tollerance here
if (sDatum.DatumType == dDatum.DatumType)
{
if (sDatum.Spheroid.EquatorialRadius == dDatum.Spheroid.EquatorialRadius)
{
if (Math.Abs(sDatum.Spheroid.EccentricitySquared() - dDatum.Spheroid.EccentricitySquared()) < 0.000000000050)
{
// The tolerence is to allow GRS80 and WGS84 to escape without being transformed at all.
return;
}
}
}
double srcA = sDatum.Spheroid.EquatorialRadius;
double srcEs = sDatum.Spheroid.EccentricitySquared();
double dstA = dDatum.Spheroid.EquatorialRadius;
double dstEs = dDatum.Spheroid.EccentricitySquared();
/* -------------------------------------------------------------------- */
/* Create a temporary Z value if one is not provided. */
/* -------------------------------------------------------------------- */
if (z == null)
{
z = new double[xy.Length / 2];
}
/* -------------------------------------------------------------------- */
/* If this datum requires grid shifts, then apply it to geodetic */
/* coordinates. */
/* -------------------------------------------------------------------- */
if (sDatum.DatumType == DatumType.GridShift)
{
// pj_apply_gridshift(pj_param(srcdefn->params,"snadgrids").s, 0,
// point_count, point_offset, x, y, z );
GridShift.Apply(source.GeographicInfo.Datum.NadGrids, false, xy, startIndex, numPoints);
srcA = wgs84.EquatorialRadius;
srcEs = wgs84.EccentricitySquared();
}
if (dDatum.DatumType == DatumType.GridShift)
{
dstA = wgs84.EquatorialRadius;
dstEs = wgs84.EccentricitySquared();
}
/* ==================================================================== */
/* Do we need to go through geocentric coordinates? */
/* ==================================================================== */
if (srcEs != dstEs || srcA != dstA ||
sDatum.DatumType == DatumType.Param3 ||
sDatum.DatumType == DatumType.Param7 ||
dDatum.DatumType == DatumType.Param3 ||
dDatum.DatumType == DatumType.Param7)
{
/* -------------------------------------------------------------------- */
/* Convert to geocentric coordinates. */
/* -------------------------------------------------------------------- */
GeocentricGeodetic gc = new GeocentricGeodetic(sDatum.Spheroid);
gc.GeodeticToGeocentric(xy, z, startIndex, numPoints);
/* -------------------------------------------------------------------- */
/* Convert between datums. */
/* -------------------------------------------------------------------- */
if (sDatum.DatumType == DatumType.Param3 || sDatum.DatumType == DatumType.Param7)
{
PjGeocentricToWgs84(source, xy, z, startIndex, numPoints);
}
if (dDatum.DatumType == DatumType.Param3 || dDatum.DatumType == DatumType.Param7)
{
PjGeocentricFromWgs84(dest, xy, z, startIndex, numPoints);
}
/* -------------------------------------------------------------------- */
/* Convert back to geodetic coordinates. */
/* -------------------------------------------------------------------- */
gc = new GeocentricGeodetic(dDatum.Spheroid);
gc.GeocentricToGeodetic(xy, z, startIndex, numPoints);
}
/* -------------------------------------------------------------------- */
/* Apply grid shift to destination if required. */
/* -------------------------------------------------------------------- */
if (dDatum.DatumType == DatumType.GridShift)
{
// pj_apply_gridshift(pj_param(dstdefn->params,"snadgrids").s, 1,
// point_count, point_offset, x, y, z );
GridShift.Apply(dest.GeographicInfo.Datum.NadGrids, true, xy, startIndex, numPoints);
}
}
/// <summary>
/// datum tranform method
/// </summary>
/// <param name="source"></param>
/// <param name="dest"></param>
/// <param name="xy"></param>
/// <param name="z"></param>
/// <param name="startIndex"></param>
/// <param name="numPoints"></param>
public void Transform(ProjectionInfo source, ProjectionInfo dest, double[] xy, double[] z, int startIndex, int numPoints)
{
if (_aiDts.Length == 0) return; // "empty" datum transform
bool bCoordsAreGeocentric = false;
/* -------------------------------------------------------------------- */
/* Create a temporary Z value if one is not provided. */
/* -------------------------------------------------------------------- */
if (z == null)
{
z = new double[xy.Length / 2];
}
foreach (IDatumTransformStage idts in _aiDts)
{
if (idts.Method == TransformMethod.GridShift)
{
if (bCoordsAreGeocentric)
{
var gc = new GeocentricGeodetic(idts.FromSpheroid);
gc.GeocentricToGeodetic(xy, z, startIndex, numPoints);
bCoordsAreGeocentric = false;
}
var astrGrids = new string[1];
astrGrids[0] = "@" + idts.GridShiftTable;
GridShift.Apply(astrGrids, idts.ApplyTableInverse, xy, startIndex, numPoints);
}
else
{
if (!bCoordsAreGeocentric)
{
var gc = new GeocentricGeodetic(idts.FromSpheroid);
gc.GeodeticToGeocentric(xy, z, startIndex, numPoints);
bCoordsAreGeocentric = true;
}
ApplyParameterizedTransform(idts, xy, z, startIndex, numPoints);
}
}
/* -------------------------------------------------------------------- */
/* Convert back to geodetic coordinates, if needed. */
/* -------------------------------------------------------------------- */
if (bCoordsAreGeocentric)
{
var gc = new GeocentricGeodetic(_aiDts[_aiDts.Length - 1].ToSpheroid);
gc.GeocentricToGeodetic(xy, z, startIndex, numPoints);
}
}