/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static GeoAPI.CoordinateSystems.IProjection ReadProjection(GisSharpBlog.NetTopologySuite.IO.WktStreamTokenizer tokenizer)
{
//tokenizer.NextToken();// PROJECTION
tokenizer.ReadToken("PROJECTION");
tokenizer.ReadToken("[");//[
string projectionName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken("]"); //]
tokenizer.ReadToken(","); //,
tokenizer.ReadToken("PARAMETER");
List <GeoAPI.CoordinateSystems.ProjectionParameter> paramList = new List <GeoAPI.CoordinateSystems.ProjectionParameter>();
while (tokenizer.GetStringValue() == "PARAMETER")
{
tokenizer.ReadToken("[");
string paramName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double paramValue = tokenizer.GetNumericValue();
tokenizer.ReadToken("]");
tokenizer.ReadToken(",");
paramList.Add(new GeoAPI.CoordinateSystems.ProjectionParameter(paramName, paramValue));
tokenizer.NextToken();
}
string authority = String.Empty;
long authorityCode = -1;
GeoAPI.CoordinateSystems.IProjection projection = new Projection(projectionName, paramList, String.Empty, authority, authorityCode, String.Empty, String.Empty, string.Empty);
return(projection);
}
/// <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>
/// Reads and parses a WKT-formatted projection string.
/// </summary>
/// <param name="wkt">String containing WKT.</param>
/// <returns>Object representation of the WKT.</returns>
/// <exception cref="System.ArgumentException">If a token is not recognised.</exception>
public static GeoAPI.CoordinateSystems.IInfo Parse(string wkt)
{
GeoAPI.CoordinateSystems.IInfo returnObject = null;
StringReader reader = new StringReader(wkt);
GisSharpBlog.NetTopologySuite.IO.WktStreamTokenizer tokenizer = new GisSharpBlog.NetTopologySuite.IO.WktStreamTokenizer(reader);
tokenizer.NextToken();
string objectName = tokenizer.GetStringValue();
switch (objectName)
{
case "UNIT":
returnObject = ReadUnit(tokenizer);
break;
//case "VERT_DATUM":
// IVerticalDatum verticalDatum = ReadVerticalDatum(tokenizer);
// returnObject = verticalDatum;
// break;
case "SPHEROID":
returnObject = ReadEllipsoid(tokenizer);
break;
case "DATUM":
returnObject = ReadHorizontalDatum(tokenizer);;
break;
case "PRIMEM":
returnObject = ReadPrimeMeridian(tokenizer);
break;
//case "VERT_CS":
// IVerticalCoordinateSystem verticalCS = ReadVerticalCoordinateSystem(tokenizer);
// returnObject = verticalCS;
// break;
case "GEOGCS":
returnObject = ReadGeographicCoordinateSystem(tokenizer);
break;
case "PROJCS":
returnObject = ReadProjectedCoordinateSystem(tokenizer);
break;
//case "COMPD_CS":
// ICompoundCoordinateSystem compoundCS = ReadCompoundCoordinateSystem(tokenizer);
// returnObject = compoundCS;
// break;
case "GEOCCS":
case "FITTED_CS":
case "LOCAL_CS":
throw new NotSupportedException(String.Format("{0} is not implemented.", objectName));
default:
throw new ArgumentException(String.Format("'{0'} is not recongnized.", objectName));
}
reader.Close();
return(returnObject);
}