public void TestDatumTransform()
{
CoordinateSystemFactory cFac = new CoordinateSystemFactory();
//Define datums
HorizontalDatum wgs72 = HorizontalDatum.WGS72;
HorizontalDatum ed50 = HorizontalDatum.ED50;
//Define geographic coordinate systems
IGeographicCoordinateSystem gcsWGS72 = cFac.CreateGeographicCoordinateSystem("WGS72 Geographic", AngularUnit.Degrees, wgs72, PrimeMeridian.Greenwich,
new AxisInfo("East", AxisOrientationEnum.East), new AxisInfo("North", AxisOrientationEnum.North));
IGeographicCoordinateSystem gcsWGS84 = cFac.CreateGeographicCoordinateSystem("WGS84 Geographic", AngularUnit.Degrees, HorizontalDatum.WGS84, PrimeMeridian.Greenwich,
new AxisInfo("East", AxisOrientationEnum.East), new AxisInfo("North", AxisOrientationEnum.North));
IGeographicCoordinateSystem gcsED50 = cFac.CreateGeographicCoordinateSystem("ED50 Geographic", AngularUnit.Degrees, ed50, PrimeMeridian.Greenwich,
new AxisInfo("East", AxisOrientationEnum.East), new AxisInfo("North", AxisOrientationEnum.North));
//Define geocentric coordinate systems
IGeocentricCoordinateSystem gcenCsWGS72 = cFac.CreateGeocentricCoordinateSystem("WGS72 Geocentric", wgs72, LinearUnit.Metre, PrimeMeridian.Greenwich);
IGeocentricCoordinateSystem gcenCsWGS84 = cFac.CreateGeocentricCoordinateSystem("WGS84 Geocentric", HorizontalDatum.WGS84, LinearUnit.Metre, PrimeMeridian.Greenwich);
IGeocentricCoordinateSystem gcenCsED50 = cFac.CreateGeocentricCoordinateSystem("ED50 Geocentric", ed50, LinearUnit.Metre, PrimeMeridian.Greenwich);
//Define projections
List<ProjectionParameter> parameters = new List<ProjectionParameter>(5);
parameters.Add(new ProjectionParameter("latitude_of_origin", 0));
parameters.Add(new ProjectionParameter("central_meridian", 9));
parameters.Add(new ProjectionParameter("scale_factor", 0.9996));
parameters.Add(new ProjectionParameter("false_easting", 500000));
parameters.Add(new ProjectionParameter("false_northing", 0));
IProjection projection = cFac.CreateProjection("Transverse Mercator", "Transverse_Mercator", parameters);
IProjectedCoordinateSystem utmED50 = cFac.CreateProjectedCoordinateSystem("ED50 UTM Zone 32N", gcsED50, projection, LinearUnit.Metre, new AxisInfo("East", AxisOrientationEnum.East), new AxisInfo("North", AxisOrientationEnum.North));
IProjectedCoordinateSystem utmWGS84 = cFac.CreateProjectedCoordinateSystem("WGS84 UTM Zone 32N", gcsWGS84, projection, LinearUnit.Metre, new AxisInfo("East", AxisOrientationEnum.East), new AxisInfo("North", AxisOrientationEnum.North));
//Set TOWGS84 parameters
wgs72.Wgs84Parameters = new Wgs84ConversionInfo(0, 0, 4.5, 0, 0, 0.554, 0.219);
ed50.Wgs84Parameters = new Wgs84ConversionInfo(-81.0703, -89.3603, -115.7526,
-0.48488, -0.02436, -0.41321,
-0.540645); //Parameters for Denmark
//Set up coordinate transformations
CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory();
ICoordinateTransformation ctForw = ctFac.CreateFromCoordinateSystems(gcsWGS72, gcenCsWGS72); //Geographic->Geocentric (WGS72)
ICoordinateTransformation ctWGS84_Gcen2Geo = ctFac.CreateFromCoordinateSystems(gcenCsWGS84, gcsWGS84); //Geocentric->Geographic (WGS84)
ICoordinateTransformation ctWGS84_Geo2UTM = ctFac.CreateFromCoordinateSystems(gcsWGS84, utmWGS84); //UTM ->Geographic (WGS84)
ICoordinateTransformation ctED50_UTM2Geo = ctFac.CreateFromCoordinateSystems(utmED50, gcsED50); //UTM ->Geographic (ED50)
ICoordinateTransformation ctED50_Geo2Gcen = ctFac.CreateFromCoordinateSystems(gcsED50, gcenCsED50); //Geographic->Geocentric (ED50)
//Test datum-shift from WGS72 to WGS84
//Point3D pGeoCenWGS72 = ctForw.MathTransform.Transform(pLongLatWGS72) as Point3D;
double[] pGeoCenWGS72 = new double[] {3657660.66, 255768.55, 5201382.11};
ICoordinateTransformation geocen_ed50_2_Wgs84 = ctFac.CreateFromCoordinateSystems(gcenCsWGS72, gcenCsWGS84);
double[] pGeoCenWGS84 = geocen_ed50_2_Wgs84.MathTransform.Transform(pGeoCenWGS72);
//Point3D pGeoCenWGS84 = wgs72.Wgs84Parameters.Apply(pGeoCenWGS72);
Assert.IsTrue(ToleranceLessThan(new double[] { 3657660.78, 255778.43, 5201387.75 }, pGeoCenWGS84, 0.01));
ICoordinateTransformation utm_ed50_2_Wgs84 = ctFac.CreateFromCoordinateSystems(utmED50, utmWGS84);
double[] pUTMED50 = new double[] {600000, 6100000};
double[] pUTMWGS84 = utm_ed50_2_Wgs84.MathTransform.Transform(pUTMED50);
Assert.IsTrue(ToleranceLessThan(new double[] { 599928.6, 6099790.2 }, pUTMWGS84, 0.1));
//Perform reverse
ICoordinateTransformation utm_Wgs84_2_Ed50 = ctFac.CreateFromCoordinateSystems(utmWGS84, utmED50);
pUTMED50 = utm_Wgs84_2_Ed50.MathTransform.Transform(pUTMWGS84);
Assert.IsTrue(ToleranceLessThan(new double[] {600000, 6100000}, pUTMED50, 0.1));
//Assert.IsTrue(Math.Abs((pUTMWGS84 as Point3D).Z - 36.35) < 0.5);
//Point pExpected = Point.FromDMS(2, 7, 46.38, 53, 48, 33.82);
//ED50_to_WGS84_Denmark: datum.Wgs84Parameters = new Wgs84ConversionInfo(-89.5, -93.8, 127.6, 0, 0, 4.5, 1.2);
}
private void TestGeocentric()
{
CoordinateSystemFactory cFac = new CoordinateSystemFactory();
IGeographicCoordinateSystem gcs = cFac.CreateGeographicCoordinateSystem("WGS84", AngularUnit.Degrees,
HorizontalDatum.WGS84,
PrimeMeridian.Greenwich,
new AxisInfo("Lon",
AxisOrientationEnum.East),
new AxisInfo("Lat",
AxisOrientationEnum.North));
IGeocentricCoordinateSystem geoccs = cFac.CreateGeocentricCoordinateSystem("WGS84 geocentric",
gcs.HorizontalDatum, LinearUnit.Metre,
PrimeMeridian.Greenwich);
ICoordinateTransformation trans = new CoordinateTransformationFactory().CreateFromCoordinateSystems(gcs, geoccs);
var pGeo = new Coordinate(2.12955, 53.80939444, 73);
var pGc = Transform(trans.MathTransform, pGeo);
trans.MathTransform.Invert();
var pGeo2 = Transform(trans.MathTransform, pGc);
trans.MathTransform.Invert();
result.Text += PrintResultTable(gcs, geoccs, pGeo, pGc, new Coordinate(3771793.97, 140253.34, 5124304.35), pGeo2,
"Geocentric test");
return;
}
public void TestGeocentric()
{
CoordinateSystemFactory cFac = new CoordinateSystemFactory();
IGeographicCoordinateSystem gcs = cFac.CreateGeographicCoordinateSystem("ETRF89 Geographic", AngularUnit.Degrees, HorizontalDatum.ETRF89, PrimeMeridian.Greenwich,
new AxisInfo("East", AxisOrientationEnum.East), new AxisInfo("North", AxisOrientationEnum.North));
IGeocentricCoordinateSystem gcenCs = cFac.CreateGeocentricCoordinateSystem("ETRF89 Geocentric", HorizontalDatum.ETRF89, LinearUnit.Metre, PrimeMeridian.Greenwich);
CoordinateTransformationFactory gtFac = new CoordinateTransformationFactory();
ICoordinateTransformation ct = gtFac.CreateFromCoordinateSystems(gcs, gcenCs);
double[] pExpected = new double[] { 2 + 7.0 / 60 + 46.38 / 3600, 53 + 48.0 / 60 + 33.82/3600 }; // Point.FromDMS(2, 7, 46.38, 53, 48, 33.82);
double[] pExpected3D = new double[] { pExpected[0], pExpected[1], 73.0 };
double[] p0 = new double[] { 3771793.97, 140253.34, 5124304.35 };
double[] p1 = ct.MathTransform.Transform(pExpected3D) as double[];
double[] p2 = ct.MathTransform.Inverse().Transform(p1) as double[];
Assert.IsTrue(ToleranceLessThan(p1, p0, 0.01));
Assert.IsTrue(ToleranceLessThan(p2, pExpected, 0.00001));
}