/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static Ellipsoid ReadEllipsoid(WktStreamTokenizer tokenizer)
{
//SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double majorAxis = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double e = tokenizer.GetNumericValue();
//
//tokenizer.ReadToken(",");
tokenizer.NextToken();
string authority = String.Empty;
long authorityCode = -1;
if (tokenizer.GetStringValue() == ",") //Read authority
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
Ellipsoid ellipsoid = new Ellipsoid(majorAxis, e, LinearUnit.Metre)
{
Name = name,
Id = authorityCode + ""
};
return(ellipsoid);
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static Projection ReadProjection(WktStreamTokenizer tokenizer)
{
//tokenizer.NextToken();// PROJECTION
tokenizer.ReadToken("PROJECTION");
tokenizer.ReadToken("[");//[
string projectionName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken("]"); //]
tokenizer.ReadToken(","); //,
tokenizer.ReadToken("PARAMETER");
List <ProjectionParameter> paramList = new List <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 ProjectionParameter(paramName, paramValue));
tokenizer.NextToken();
}
string authority = String.Empty;
long authorityCode = -1;
Projection projection = new Projection(
projectionName, paramList, authorityCode + "", projectionName);
return(projection);
}
/// <summary>
/// Returns a <see cref="AngularUnit"/> given a piece of WKT.
/// </summary>
/// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
/// <returns>An object that implements the IUnit interface.</returns>
private static AngularUnit ReadAngularUnit(WktStreamTokenizer tokenizer)
{
tokenizer.ReadToken("[");
string unitName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double unitsPerUnit = tokenizer.GetNumericValue();
string authority = String.Empty;
long authorityCode = -1;
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
return(new AngularUnit()
{
Id = authorityCode + "",
Name = unitName,
Abbreviation = unitName,
RadiansPerUnit = unitsPerUnit
});
}
/// <summary>
/// Reads either 3, 6 or 7 parameter Bursa-Wolf values from TOWGS84 token
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static BursaTransParams ReadWGS84ConversionInfo(WktStreamTokenizer tokenizer)
{
//TOWGS84[0,0,0,0,0,0,0]
tokenizer.ReadToken("[");
BursaTransParams info = new BursaTransParams();
tokenizer.NextToken();
info.Dx = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Dy = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Dz = tokenizer.GetNumericValue();
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
info.Ex = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ey = tokenizer.GetNumericValue();
tokenizer.ReadToken(",");
tokenizer.NextToken();
info.Ez = tokenizer.GetNumericValue();
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
info.Scale_ppm = tokenizer.GetNumericValue();
}
}
if (tokenizer.GetStringValue() != "]")
{
tokenizer.ReadToken("]");
}
return(info);
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static PrimeMeridian ReadPrimeMeridian(WktStreamTokenizer tokenizer)
{
//PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double longitude = tokenizer.GetNumericValue();
tokenizer.NextToken();
string authority = String.Empty;
long authorityCode = -1;
if (tokenizer.GetStringValue() == ",")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
// make an assumption about the Angular units - degrees.
PrimeMeridian primeMeridian = new PrimeMeridian(longitude, AngularUnit.Degree, name, authorityCode + "");
return(primeMeridian);
}