private static ICoordinateTransformation Proj2Geog(IProjectedCoordinateSystem source, IGeographicCoordinateSystem target)
{
if (source.GeographicCoordinateSystem.EqualParams(target))
{
IMathTransform mathTransform = CreateCoordinateOperation(source.Projection, source.GeographicCoordinateSystem.HorizontalDatum.Ellipsoid, source.LinearUnit).Inverse();
return(new CoordinateTransformation(source, target, TransformType.Transformation, mathTransform,
String.Empty, String.Empty, -1, String.Empty, String.Empty));
}
else
{ // Geographic coordinatesystems differ - Create concatenated transform
ConcatenatedTransform ct = new ConcatenatedTransform();
CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory();
ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source, source.GeographicCoordinateSystem));
ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source.GeographicCoordinateSystem, target));
return(new CoordinateTransformation(source,
target, TransformType.Transformation, ct,
String.Empty, String.Empty, -1, String.Empty, String.Empty));
}
}
private static ICoordinateTransformation Proj2Proj(IProjectedCoordinateSystem source, IProjectedCoordinateSystem target)
{
var ct = new ConcatenatedTransform();
var ctFac = new CoordinateTransformationFactory();
//First transform from projection to geographic
ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source, source.GeographicCoordinateSystem));
//Transform geographic to geographic:
var geogToGeog = ctFac.CreateFromCoordinateSystems(source.GeographicCoordinateSystem,
target.GeographicCoordinateSystem);
if (geogToGeog != null)
{
ct.CoordinateTransformationList.Add(geogToGeog);
}
//Transform to new projection
ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(target.GeographicCoordinateSystem, target));
return(new CoordinateTransformation(source,
target, TransformType.Transformation, ct,
String.Empty, String.Empty, -1, String.Empty, String.Empty));
}
/// <summary>
/// Creates transformation from source coordinate system to specified target system which is the fitted one
/// </summary>
/// <param name="source"></param>
/// <param name="target"></param>
/// <returns></returns>
private static ICoordinateTransformation Any2Fitt(ICoordinateSystem source, IFittedCoordinateSystem target)
{
//Transform form base system of fitted to target coordinate system - use invered math transform
IMathTransform invMt = CreateFittedTransform(target).Inverse();
//case when source system is equal to base system of the fitted
if (target.BaseCoordinateSystem.EqualParams(source))
{
//Transform form base system of fitted to target coordinate system
return(CreateTransform(source, target, TransformType.Transformation, invMt));
}
ConcatenatedTransform ct = new ConcatenatedTransform();
//First transform from source to base system of fitted
CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory();
ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source, target.BaseCoordinateSystem));
//Transform form base system of fitted to target coordinate system - use invered math transform
ct.CoordinateTransformationList.Add(CreateTransform(target.BaseCoordinateSystem, target, TransformType.Transformation, invMt));
return(CreateTransform(source, target, TransformType.Transformation, ct));
}
/// <summary>
/// Creates transformation from fitted coordinate system to the target one
/// </summary>
/// <param name="source"></param>
/// <param name="target"></param>
/// <returns></returns>
private static ICoordinateTransformation Fitt2Any(IFittedCoordinateSystem source, ICoordinateSystem target)
{
//transform from fitted to base system of fitted (which is equal to target)
IMathTransform mt = CreateFittedTransform(source);
//case when target system is equal to base system of the fitted
if (source.BaseCoordinateSystem.EqualParams(target))
{
//Transform form base system of fitted to target coordinate system
return(CreateTransform(source, target, TransformType.Transformation, mt));
}
//Transform form base system of fitted to target coordinate system
ConcatenatedTransform ct = new ConcatenatedTransform();
ct.CoordinateTransformationList.Add(CreateTransform(source, source.BaseCoordinateSystem, TransformType.Transformation, mt));
//Transform form base system of fitted to target coordinate system
CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory();
ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source.BaseCoordinateSystem, target));
return(CreateTransform(source, target, TransformType.Transformation, ct));
}