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.NextToken();
string authority = string.Empty;
long authorityCode = -1;
if (tokenizer.GetStringValue() == ",") //Read authority
{
tokenizer.ReadAuthority(out authority, out authorityCode);
tokenizer.ReadToken("]");
}
var ellipsoid = new Ellipsoid(majorAxis, 0.0, e, true, LinearUnit.Metre, name, authority, authorityCode, string.Empty, string.Empty, string.Empty);
return(ellipsoid);
}
private static ParameterInfo ReadParameters(WktStreamTokenizer tokenizer)
{
var paramList = new List <Parameter> ();
while (tokenizer.GetStringValue() == "PARAMETER")
{
tokenizer.ReadToken("[");
string paramName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double paramValue = tokenizer.GetNumericValue();
tokenizer.ReadToken("]");
//test, whether next parameter is delimited by comma
tokenizer.NextToken();
if (tokenizer.GetStringValue() != "]")
{
tokenizer.NextToken();
}
paramList.Add(new Parameter(paramName, paramValue));
}
var info = new ParameterInfo()
{
Parameters = paramList
};
return(info);
}
/// <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(out authority, out authorityCode);
tokenizer.ReadToken("]");
}
return(new AngularUnit(unitsPerUnit, unitName, authority, authorityCode, string.Empty, string.Empty, string.Empty));
}
// Reads either 3, 6 or 7 parameter Bursa-Wolf values from TOWGS84 token
private static Wgs84ConversionInfo ReadWGS84ConversionInfo(WktStreamTokenizer tokenizer)
{
//TOWGS84[0,0,0,0,0,0,0]
tokenizer.ReadToken("[");
var info = new Wgs84ConversionInfo();
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.Ppm = tokenizer.GetNumericValue();
}
}
if (tokenizer.GetStringValue() != "]")
{
tokenizer.ReadToken("]");
}
return(info);
}
private static IProjection ReadProjection(WktStreamTokenizer tokenizer)
{
if (tokenizer.GetStringValue() != "PROJECTION")
{
tokenizer.ReadToken("PROJECTION");
}
tokenizer.ReadToken("[");//[
string projectionName = tokenizer.ReadDoubleQuotedWord();
string authority = string.Empty;
long authorityCode = -1L;
tokenizer.NextToken(true);
if (tokenizer.GetStringValue() == ",")
{
tokenizer.ReadAuthority(out authority, out authorityCode);
tokenizer.ReadToken("]");
}
tokenizer.ReadToken(",");//,
tokenizer.ReadToken("PARAMETER");
var 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();
}
var projection = new Projection(projectionName, paramList, projectionName, authority, authorityCode, string.Empty, string.Empty, string.Empty);
return(projection);
}
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(out authority, out authorityCode);
tokenizer.ReadToken("]");
}
// make an assumption about the Angular units - degrees.
var primeMeridian = new PrimeMeridian(longitude, AngularUnit.Degrees, name, authority, authorityCode, string.Empty, string.Empty, string.Empty);
return(primeMeridian);
}
