/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static GeoAPI.CoordinateSystems.IHorizontalDatum ReadHorizontalDatum(GisSharpBlog.NetTopologySuite.IO.WktStreamTokenizer tokenizer)
{
//DATUM["OSGB 1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6277"]]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("SPHEROID");
GeoAPI.CoordinateSystems.IEllipsoid ellipsoid = ReadEllipsoid(tokenizer);
tokenizer.ReadToken(",");
GeoAPI.CoordinateSystems.Wgs84ConversionInfo wgsInfo = new GeoAPI.CoordinateSystems.Wgs84ConversionInfo();
if (tokenizer.GetStringValue() == "TOWGS84")
{
tokenizer.ReadToken("TOWGS84");
wgsInfo = ReadWGS84ConversionInfo(tokenizer);
tokenizer.ReadToken(",");
}
string authority = String.Empty;
long authorityCode = -1;
tokenizer.ReadAuthority(ref authority, ref authorityCode);
// make an assumption about the datum type.
GeoAPI.CoordinateSystems.IHorizontalDatum horizontalDatum = new HorizontalDatum(ellipsoid, wgsInfo, GeoAPI.CoordinateSystems.DatumType.HD_Geocentric, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
tokenizer.ReadToken("]");
return(horizontalDatum);
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static GeoAPI.CoordinateSystems.Wgs84ConversionInfo ReadWGS84ConversionInfo(GisSharpBlog.NetTopologySuite.IO.WktStreamTokenizer tokenizer)
{
//TOWGS84[0,0,0,0,0,0,0]
tokenizer.ReadToken("[");
GeoAPI.CoordinateSystems.Wgs84ConversionInfo info = new GeoAPI.CoordinateSystems.Wgs84ConversionInfo();
tokenizer.NextToken();
info.Dx = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Dy = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Dz = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ex = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ey = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ez = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ppm = tokenizer.GetNumericValue();
tokenizer.ReadToken("]");
return(info);
}
