private static ProjectedCoordinateSystem ReadProjectedCoordinateSystem(string[] parameters)
{
// +proj=tmerc +lat_0=0 +lon_0=-62 +k=0.999500 +x_0=400000 +y_0=0 +ellps=clrk80 +towgs84=725,685,536,0,0,0,0 +units=m +no_defs
string projParam = ParameterValue(parameters, "+proj");
string projName = ProjDB.ProjectionNameByP4(projParam);
List <ProjectionParameter> projParameters = new List <ProjectionParameter>();
if (projParam.ToLower() == "utm" && projName.ToLower() == "transverse_mercator")
{
projParameters.Add(new ProjectionParameter("scale_factor", 0.9996));
projParameters.Add(new ProjectionParameter("false_easting", 500000.0));
}
foreach (string p4param in parameters)
{
string val;
string p4 = Parameter(p4param, out val);
double v;
if (!double.TryParse(val, NumberStyles.Number, _nhi, out v))
{
continue;
}
switch (p4)
{
case "+lat_0":
projParameters.Add(new ProjectionParameter("latitude_of_origin", v));
break;
case "+lon_0":
projParameters.Add(new ProjectionParameter("longitude_of_origin", v));
projParameters.Add(new ProjectionParameter("central_meridian", v));
break;
case "+k":
projParameters.Add(new ProjectionParameter("scale_factor", v));
break;
case "+x_0":
projParameters.Add(new ProjectionParameter("false_easting", v));
break;
case "+y_0":
projParameters.Add(new ProjectionParameter("false_northing", v));
break;
case "+alpha":
projParameters.Add(new ProjectionParameter("azimuth", v));
break;
case "+lat_1":
projParameters.Add(new ProjectionParameter("standard_parallel_1", v));
break;
case "+lat_2":
projParameters.Add(new ProjectionParameter("standard_parallel_2", v));
break;
case "+zone":
projParameters.Add(new ProjectionParameter("Central_Meridian", -177.0 + 6 * (v - 1)));
break;
}
}
Projection proj = new Projection(projName, projParameters.ToArray(), "", "", "", "");
GeographicCoordinateSystem geogrCoordSystem = ReadGeographicCoordinateSystem(parameters);
AxisInfo[] axis =
{
new AxisInfo("Easting", AxisOrientation.East),
new AxisInfo("Northing", AxisOrientation.North)
};
ProjectedCoordinateSystem projCoordSystem = new ProjectedCoordinateSystem(
geogrCoordSystem.HorizontalDatum,
axis,
geogrCoordSystem,
new LinearUnit(1.0, String.Empty, String.Empty, String.Empty, "metre", String.Empty, String.Empty),
proj);
projCoordSystem.Name = "Unknown";
return(projCoordSystem);
}
private static ProjectedCoordinateSystem ReadProjectedCoordinateSystem(WktStreamTokenizer tokenizer, bool includeAuthority)
{
//PROJCS[
// "OSGB 1936 / British National Grid",
// GEOGCS[
// "OSGB 1936",
// DATUM[...]
// PRIMEM[...]
// AXIS["Geodetic latitude",NORTH]
// AXIS["Geodetic longitude",EAST]
// AUTHORITY["EPSG","4277"]
// ],
// PROJECTION["Transverse Mercator"],
// PARAMETER["latitude_of_natural_origin",49],
// PARAMETER["longitude_of_natural_origin",-2],
// PARAMETER["scale_factor_at_natural_origin",0.999601272],
// PARAMETER["false_easting",400000],
// PARAMETER["false_northing",-100000],
// AXIS["Easting",EAST],
// AXIS["Northing",NORTH],
// AUTHORITY["EPSG","27700"]
//]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("GEOGCS");
GeographicCoordinateSystem geographicCS = ReadGeographicCoordinateSystem(tokenizer, includeAuthority);
tokenizer.ReadToken(",");
Projection projection = ReadProjection(tokenizer, includeAuthority);
tokenizer.ReadToken("UNIT");
Unit unit = ReadUnit(tokenizer, includeAuthority);
AxisInfo axisInfo1 = null, axisInfo2 = null;
if (tokenizer.TryReadToken(","))
{
if (tokenizer.TryReadToken("AXIS"))
{
axisInfo1 = ReadAxisInfo(tokenizer);
}
if (tokenizer.TryReadToken(","))
{
if (tokenizer.TryReadToken("AXIS"))
{
axisInfo2 = ReadAxisInfo(tokenizer);
}
}
}
string authority = String.Empty;
string authorityCode = String.Empty;
if (includeAuthority)
{
tokenizer.ReadToken(",");
tokenizer.ReadAuthority(ref authority, ref authorityCode);
}
tokenizer.ReadToken("]");
int axisInfoDim = 0;
if (axisInfo1 != null)
{
axisInfoDim = 1;
}
if (axisInfo2 != null)
{
axisInfoDim = 2;
}
AxisInfo[] axisArray = new AxisInfo[axisInfoDim];
if (axisInfo1 != null)
{
axisArray[0] = axisInfo1;
}
if (axisInfo2 != null)
{
axisArray[1] = axisInfo2;
}
ProjectedCoordinateSystem projectedCS = new ProjectedCoordinateSystem(geographicCS.HorizontalDatum, axisArray, geographicCS, unit as LinearUnit, projection, String.Empty, authority, authorityCode, name, String.Empty, String.Empty);
return(projectedCS);
}
