/// <summary> /// Geographic to geographic transformation /// </summary> /// <remarks>Adds a datum shift if nessesary</remarks> /// <param name="source"></param> /// <param name="target"></param> /// <returns></returns> private ICoordinateTransformation CreateGeog2Geog(IGeographicCoordinateSystem source, IGeographicCoordinateSystem target) { if (source.HorizontalDatum.EqualParams(target.HorizontalDatum)) { //No datum shift needed return(new CoordinateTransformation(source, target, TransformType.Conversion, new GeographicTransform(source, target), String.Empty, String.Empty, -1, String.Empty, String.Empty)); } else { //Create datum shift //Convert to geocentric, perform shift and return to geographic CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory(); CoordinateSystemFactory cFac = new CoordinateSystemFactory(); IGeocentricCoordinateSystem sourceCentric = cFac.CreateGeocentricCoordinateSystem(source.HorizontalDatum.Name + " Geocentric", source.HorizontalDatum, LinearUnit.Metre, source.PrimeMeridian); IGeocentricCoordinateSystem targetCentric = cFac.CreateGeocentricCoordinateSystem(target.HorizontalDatum.Name + " Geocentric", target.HorizontalDatum, LinearUnit.Metre, source.PrimeMeridian); ConcatenatedTransform ct = new ConcatenatedTransform(); ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source, sourceCentric)); ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(sourceCentric, targetCentric)); ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(targetCentric, 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) { ConcatenatedTransform ct = new ConcatenatedTransform(); CoordinateTransformationFactory ctFac = new CoordinateTransformationFactory(); //First transform from projection to geographic ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source, source.GeographicCoordinateSystem)); //Transform geographic to geographic: ct.CoordinateTransformationList.Add(ctFac.CreateFromCoordinateSystems(source.GeographicCoordinateSystem, target.GeographicCoordinateSystem)); //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> /// Geocentric to Geocentric transformation /// </summary> /// <param name="source"></param> /// <param name="target"></param> /// <returns></returns> private static ICoordinateTransformation CreateGeoc2Geoc(IGeocentricCoordinateSystem source, IGeocentricCoordinateSystem target) { ConcatenatedTransform ct = new ConcatenatedTransform(); //Does source has a datum different from WGS84 and is there a shift specified? if (source.HorizontalDatum.Wgs84Parameters != null && !source.HorizontalDatum.Wgs84Parameters.HasZeroValuesOnly) { ct.CoordinateTransformationList.Add( new CoordinateTransformation( ((target.HorizontalDatum.Wgs84Parameters == null || target.HorizontalDatum.Wgs84Parameters.HasZeroValuesOnly) ? target : GeocentricCoordinateSystem.WGS84), source, TransformType.Transformation, new DatumTransform(source.HorizontalDatum.Wgs84Parameters) , "", "", -1, "", "")); } //Does target has a datum different from WGS84 and is there a shift specified? if (target.HorizontalDatum.Wgs84Parameters != null && !target.HorizontalDatum.Wgs84Parameters.HasZeroValuesOnly) { ct.CoordinateTransformationList.Add( new CoordinateTransformation( ((source.HorizontalDatum.Wgs84Parameters == null || source.HorizontalDatum.Wgs84Parameters.HasZeroValuesOnly) ? source : GeocentricCoordinateSystem.WGS84), target, TransformType.Transformation, new DatumTransform(target.HorizontalDatum.Wgs84Parameters).Inverse() , "", "", -1, "", "")); } if (ct.CoordinateTransformationList.Count == 1) //Since we only have one shift, lets just return the datumshift from/to wgs84 { return(new CoordinateTransformation(source, target, TransformType.ConversionAndTransformation, ct.CoordinateTransformationList[0].MathTransform, "", "", -1, "", "")); } else { return(new CoordinateTransformation(source, target, TransformType.ConversionAndTransformation, ct, "", "", -1, "", "")); } }