internal static GeographicCoordinateSystem ReadGeographicCoordinateSystem(WktStreamTokenizer tokenizer, bool includeAuthority)
{
//GEOGCS["OSGB 1936",
//DATUM["OSGB 1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6277"]]
//PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
//UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]]
//AXIS["Geodetic latitude","NORTH"]
//AXIS["Geodetic longitude","EAST"]
//AUTHORITY["EPSG","4277"]
//]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("DATUM");
HorizontalDatum horizontalDatum = ReadHorizontalDatum(tokenizer, includeAuthority);
tokenizer.ReadToken(",");
tokenizer.ReadToken("PRIMEM");
PrimeMeridian primeMeridian = ReadPrimeMeridian(tokenizer, includeAuthority);
tokenizer.ReadToken(",");
tokenizer.ReadToken("UNIT");
Unit angularUnit = ReadUnit(tokenizer, includeAuthority);
AxisInfo axisInfo1 = null, axisInfo2 = null;
if (tokenizer.TryReadToken(","))
{
if (tokenizer.TryReadToken("AXIS"))
{
axisInfo1 = ReadAxisInfo(tokenizer);
}
if (tokenizer.TryReadToken(","))
{
if (tokenizer.TryReadToken("AXIS"))
{
axisInfo2 = ReadAxisInfo(tokenizer);
}
}
}
string authority = String.Empty;
string authorityCode = String.Empty;
if (includeAuthority)
{
tokenizer.ReadToken(",");
tokenizer.ReadAuthority(ref authority, ref authorityCode);
}
tokenizer.ReadToken("]");
GeographicCoordinateSystem geographicCS = new GeographicCoordinateSystem(angularUnit as AngularUnit, horizontalDatum,
primeMeridian, axisInfo1, axisInfo2, String.Empty, authority, authorityCode, name, String.Empty, String.Empty);
return(geographicCS);
}
private static void WritePrimeMeridian(PrimeMeridian primeMeridian, bool esri, IndentedTextWriter writer)
{
writer.WriteLine("PRIMEM[");
writer.Indent = writer.Indent + 1;
writer.WriteLine(String.Format("\"{0}\",{1}", primeMeridian.Name, primeMeridian.Longitude.ToString(_nhi)));
//writer.WriteLine(String.Format("AUTHORITY[\"{0}\",\"{1}\"]", primeMeridian.Authority, primeMeridian.AuthorityCode));
WriteAuthority(primeMeridian, esri, writer);
writer.Indent = writer.Indent - 1;
writer.WriteLine("]");
}
internal GeographicCoordinateSystem(string name,
AngularUnit angularUnit,
HorizontalDatum horizontalDatum,
PrimeMeridian primeMeridian,
AxisInfo axis0,
AxisInfo axis1)
:
this(angularUnit, horizontalDatum, primeMeridian, axis0, axis1, String.Empty, String.Empty, String.Empty, name, String.Empty, String.Empty)
{
}
internal GeographicCoordinateSystem(
AngularUnit angularUnit,
HorizontalDatum horizontalDatum,
PrimeMeridian primeMeridian,
AxisInfo axis0,
AxisInfo axis1,
string remarks, string authority, string authorityCode, string name, string alias, string abbreviation)
: base(remarks, authority, authorityCode, name, alias, abbreviation)
{
_angularUnit = angularUnit;
_horizontalDatum = horizontalDatum;
_primeMeridian = primeMeridian;
_axisInfo = new AxisInfo[] { axis0, axis1 };
// define the envelope.
_defaultEnvelope = new Envelope(-180, -90, 180, 90);
}
private static PrimeMeridian ReadPrimeMeridian(WktStreamTokenizer tokenizer, bool includeAuthority)
{
//PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]]
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
double longitude = tokenizer.GetNumericValue();
string authority = String.Empty;
string authorityCode = String.Empty;
if (includeAuthority)
{
tokenizer.ReadToken(",");
tokenizer.ReadAuthority(ref authority, ref authorityCode);
}
// make an assumption about the Angular units - degrees.
PrimeMeridian primeMeridian = new PrimeMeridian(name, new AngularUnit(180 / Math.PI), longitude, String.Empty, authority, authorityCode, String.Empty, String.Empty);
tokenizer.ReadToken("]");
return(primeMeridian);
}
public static object Create(string wkt)
{
object returnObject = null;
bool includeAuthority = (wkt.ToLower().IndexOf("authority") != -1);
StringReader reader = new StringReader(wkt);
WktStreamTokenizer tokenizer = new WktStreamTokenizer(reader);
tokenizer.NextToken();
string objectName = tokenizer.GetStringValue();
switch (objectName)
{
case "UNIT":
Unit unit = ReadUnit(tokenizer, includeAuthority);
returnObject = unit;
break;
case "VERT_DATUM":
VerticalDatum verticalDatum = ReadVerticalDatum(tokenizer, includeAuthority);
returnObject = verticalDatum;
break;
case "SPHEROID":
Ellipsoid ellipsoid = ReadEllipsoid(tokenizer, includeAuthority);
returnObject = ellipsoid;
break;
case "TOWGS84":
WGS84ConversionInfo wgsInfo = ReadWGS84ConversionInfo(tokenizer, includeAuthority);
returnObject = wgsInfo;
break;
case "DATUM":
HorizontalDatum horizontalDatum = ReadHorizontalDatum(tokenizer, includeAuthority);
returnObject = horizontalDatum;
break;
case "PRIMEM":
PrimeMeridian primeMeridian = ReadPrimeMeridian(tokenizer, includeAuthority);
returnObject = primeMeridian;
break;
case "VERT_CS":
VerticalCoordinateSystem verticalCS = ReadVerticalCoordinateSystem(tokenizer, includeAuthority);
returnObject = verticalCS;
break;
case "GEOGCS":
GeographicCoordinateSystem geographicCS = ReadGeographicCoordinateSystem(tokenizer, includeAuthority);
returnObject = geographicCS;
break;
case "PROJCS":
ProjectedCoordinateSystem projectedCS = ReadProjectedCoordinateSystem(tokenizer, includeAuthority);
returnObject = projectedCS;
break;
case "COMPD_CS":
CompoundCoordinateSystem compoundCS = ReadCompoundCoordinateSystem(tokenizer, includeAuthority);
returnObject = compoundCS;
break;
case "GEOCCS":
case "FITTED_CS":
case "LOCAL_CS":
throw new NotSupportedException(String.Format("{0} is not implemented.", objectName));
default:
throw new ParseException(String.Format("'{0'} is not recongnized.", objectName));
}
reader.Close();
return(returnObject);
}
