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 HorizontalDatum ReadHorizontalDatum(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"]]
Wgs84ConversionInfo wgsInfo = null;
string authority = string.Empty;
long authorityCode = -1;
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("SPHEROID");
var ellipsoid = ReadEllipsoid(tokenizer);
tokenizer.NextToken();
while (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
if (tokenizer.GetStringValue() == "TOWGS84")
{
wgsInfo = ReadWGS84ConversionInfo(tokenizer);
tokenizer.NextToken();
}
else if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(out authority, out authorityCode);
tokenizer.ReadToken("]");
}
}
// make an assumption about the datum type.
var horizontalDatum = new HorizontalDatum(ellipsoid, wgsInfo, DatumType.HD_Geocentric, name, authority, authorityCode, string.Empty, string.Empty, string.Empty);
return(horizontalDatum);
}
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);
}
private static FittedCoordinateSystem ReadFittedCoordinateSystem(WktStreamTokenizer tokenizer)
{
/*
* FITTED_CS[
* "Local coordinate system MNAU (based on Gauss-Krueger)",
* PARAM_MT[
* "Affine",
* PARAMETER["num_row",3],
* PARAMETER["num_col",3],
* PARAMETER["elt_0_0", 0.883485346527455],
* PARAMETER["elt_0_1", -0.468458794848877],
* PARAMETER["elt_0_2", 3455869.17937689],
* PARAMETER["elt_1_0", 0.468458794848877],
* PARAMETER["elt_1_1", 0.883485346527455],
* PARAMETER["elt_1_2", 5478710.88035753],
* PARAMETER["elt_2_2", 1],
* ],
* PROJCS["DHDN / Gauss-Kruger zone 3", GEOGCS["DHDN", DATUM["Deutsches_Hauptdreiecksnetz", SPHEROID["Bessel 1841", 6377397.155, 299.1528128, AUTHORITY["EPSG", "7004"]], TOWGS84[612.4, 77, 440.2, -0.054, 0.057, -2.797, 0.525975255930096], AUTHORITY["EPSG", "6314"]], PRIMEM["Greenwich", 0, AUTHORITY["EPSG", "8901"]], UNIT["degree", 0.0174532925199433, AUTHORITY["EPSG", "9122"]], AUTHORITY["EPSG", "4314"]], UNIT["metre", 1, AUTHORITY["EPSG", "9001"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin", 0], PARAMETER["central_meridian", 9], PARAMETER["scale_factor", 1], PARAMETER["false_easting", 3500000], PARAMETER["false_northing", 0], AUTHORITY["EPSG", "31467"]]
* AUTHORITY["CUSTOM","12345"]
* ]
*/
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("PARAM_MT");
var toBaseTransform = MathTransformWktReader.ReadMathTransform(tokenizer);
tokenizer.ReadToken(",");
tokenizer.NextToken();
var baseCS = ReadCoordinateSystem(null, tokenizer);
string authority = string.Empty;
long authorityCode = -1;
var ct = tokenizer.NextToken();
while (ct != TokenType.Eol && ct != TokenType.Eof)
{
switch (tokenizer.GetStringValue())
{
case ",":
case "]":
break;
case "AUTHORITY":
tokenizer.ReadAuthority(out authority, out authorityCode);
//tokenizer.ReadToken("]");
break;
}
ct = tokenizer.NextToken();
}
var fittedCS = new FittedCoordinateSystem(baseCS, toBaseTransform, name, authority, authorityCode, string.Empty, string.Empty, string.Empty);
return(fittedCS);
}
/// <summary>
/// Returns a <see cref="AxisInfo"/> given a piece of WKT.
/// </summary>
/// <param name="tokenizer">WktStreamTokenizer that has the WKT.</param>
/// <returns>An AxisInfo object.</returns>
private static AxisInfo ReadAxis(WktStreamTokenizer tokenizer)
{
if (tokenizer.GetStringValue() != "AXIS")
{
tokenizer.ReadToken("AXIS");
}
tokenizer.ReadToken("[");
string axisName = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.NextToken();
string unitname = tokenizer.GetStringValue();
tokenizer.ReadToken("]");
switch (unitname.ToUpperInvariant())
{
case "DOWN": return(new AxisInfo(axisName, AxisOrientationEnum.Down));
case "EAST": return(new AxisInfo(axisName, AxisOrientationEnum.East));
case "NORTH": return(new AxisInfo(axisName, AxisOrientationEnum.North));
case "OTHER": return(new AxisInfo(axisName, AxisOrientationEnum.Other));
case "SOUTH": return(new AxisInfo(axisName, AxisOrientationEnum.South));
case "UP": return(new AxisInfo(axisName, AxisOrientationEnum.Up));
case "WEST": return(new AxisInfo(axisName, AxisOrientationEnum.West));
default:
throw new ArgumentException("Invalid axis name '" + unitname + "' in WKT");
}
}
/// <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));
}
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);
}
// 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 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);
}
/// <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 recognized.</exception>
public static IInfo Parse(string wkt)
{
if (string.IsNullOrWhiteSpace(wkt))
{
throw new ArgumentNullException("wkt");
}
using (TextReader reader = new StringReader(wkt))
{
var tokenizer = new WktStreamTokenizer(reader);
tokenizer.NextToken();
string objectName = tokenizer.GetStringValue();
switch (objectName)
{
case "UNIT":
return(ReadUnit(tokenizer));
case "SPHEROID":
return(ReadEllipsoid(tokenizer));
case "DATUM":
return(ReadHorizontalDatum(tokenizer));
case "PRIMEM":
return(ReadPrimeMeridian(tokenizer));
case "VERT_CS":
case "GEOGCS":
case "PROJCS":
case "COMPD_CS":
case "GEOCCS":
case "FITTED_CS":
case "LOCAL_CS":
return(ReadCoordinateSystem(wkt, tokenizer));
default:
throw new ArgumentException($"'{objectName}' is not recognized.");
}
}
}
/// <summary>
/// Reads and parses a WKT-formatted projection string.
/// </summary>
/// <param name="wkt">String containing WKT.</param>
/// <returns>Object representation of the WKT.</returns>
/// <exception cref="System.ArgumentException">If a token is not recognised.</exception>
public static MathTransform Parse(string wkt)
{
if (string.IsNullOrWhiteSpace(wkt))
{
throw new ArgumentNullException("wkt");
}
using (TextReader reader = new StringReader(wkt))
{
var tokenizer = new WktStreamTokenizer(reader);
tokenizer.NextToken();
string objectName = tokenizer.GetStringValue();
switch (objectName)
{
case "PARAM_MT":
return(ReadMathTransform(tokenizer));
default:
throw new ArgumentException($"'{objectName}' is not recognized.");
}
}
}
private static GeographicCoordinateSystem ReadGeographicCoordinateSystem(WktStreamTokenizer tokenizer)
{
/*
* 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"]]
* AXIS["Geodetic latitude","NORTH"]
* AXIS["Geodetic longitude","EAST"]
* AUTHORITY["EPSG","4277"]
* ]
*/
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("DATUM");
var horizontalDatum = ReadHorizontalDatum(tokenizer);
tokenizer.ReadToken(",");
tokenizer.ReadToken("PRIMEM");
var primeMeridian = ReadPrimeMeridian(tokenizer);
tokenizer.ReadToken(",");
tokenizer.ReadToken("UNIT");
var angularUnit = ReadAngularUnit(tokenizer);
string authority = string.Empty;
long authorityCode = -1;
tokenizer.NextToken();
var info = new List <AxisInfo>(2);
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
while (tokenizer.GetStringValue() == "AXIS")
{
info.Add(ReadAxis(tokenizer));
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
}
}
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(out authority, out authorityCode);
tokenizer.ReadToken("]");
}
}
//This is default axis values if not specified.
if (info.Count == 0)
{
info.Add(new AxisInfo("Lon", AxisOrientationEnum.East));
info.Add(new AxisInfo("Lat", AxisOrientationEnum.North));
}
var geographicCS = new GeographicCoordinateSystem(angularUnit, horizontalDatum,
primeMeridian, info, name, authority, authorityCode, string.Empty, string.Empty, string.Empty);
return(geographicCS);
}
private static GeocentricCoordinateSystem ReadGeocentricCoordinateSystem(WktStreamTokenizer tokenizer)
{
/*
* GEOCCS["<name>", <datum>, <prime meridian>, <linear unit> {,<axis>, <axis>, <axis>} {,<authority>}]
*/
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("DATUM");
var horizontalDatum = ReadHorizontalDatum(tokenizer);
tokenizer.ReadToken(",");
tokenizer.ReadToken("PRIMEM");
var primeMeridian = ReadPrimeMeridian(tokenizer);
tokenizer.ReadToken(",");
tokenizer.ReadToken("UNIT");
var linearUnit = ReadLinearUnit(tokenizer);
string authority = string.Empty;
long authorityCode = -1;
tokenizer.NextToken();
var info = new List <AxisInfo>(3);
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
while (tokenizer.GetStringValue() == "AXIS")
{
info.Add(ReadAxis(tokenizer));
tokenizer.NextToken();
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
}
}
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(out authority, out authorityCode);
tokenizer.ReadToken("]");
}
}
//This is default axis values if not specified.
if (info.Count == 0)
{
info.Add(new AxisInfo("Geocentric X", AxisOrientationEnum.Other));
info.Add(new AxisInfo("Geocentric Y", AxisOrientationEnum.Other));
info.Add(new AxisInfo("Geocentric Z", AxisOrientationEnum.North));
}
return(new GeocentricCoordinateSystem(horizontalDatum, linearUnit, primeMeridian, info, name, authority, authorityCode,
string.Empty, string.Empty, string.Empty));
}
private static ProjectedCoordinateSystem ReadProjectedCoordinateSystem(WktStreamTokenizer tokenizer)
{
/*PROJCS[
* "OSGB 1936 / British National Grid",
* GEOGCS[
* "OSGB 1936",
* DATUM[...]
* PRIMEM[...]
* AXIS["Geodetic latitude","NORTH"]
* AXIS["Geodetic longitude","EAST"]
* AUTHORITY["EPSG","4277"]
* ],
* PROJECTION["Transverse Mercator"],
* PARAMETER["latitude_of_natural_origin",49],
* PARAMETER["longitude_of_natural_origin",-2],
* PARAMETER["scale_factor_at_natural_origin",0.999601272],
* PARAMETER["false_easting",400000],
* PARAMETER["false_northing",-100000],
* AXIS["Easting","EAST"],
* AXIS["Northing","NORTH"],
* AUTHORITY["EPSG","27700"]
* ]
*/
tokenizer.ReadToken("[");
string name = tokenizer.ReadDoubleQuotedWord();
tokenizer.ReadToken(",");
tokenizer.ReadToken("GEOGCS");
var geographicCS = ReadGeographicCoordinateSystem(tokenizer);
tokenizer.ReadToken(",");
IProjection projection = null;
IUnit unit = null;
var axes = new List <AxisInfo>(2);
string authority = string.Empty;
long authorityCode = -1;
var ct = tokenizer.NextToken();
while (ct != TokenType.Eol && ct != TokenType.Eof)
{
switch (tokenizer.GetStringValue())
{
case ",":
case "]":
break;
case "PROJECTION":
projection = ReadProjection(tokenizer);
ct = tokenizer.GetTokenType();
continue;
//break;
case "UNIT":
unit = ReadLinearUnit(tokenizer);
break;
case "AXIS":
axes.Add(ReadAxis(tokenizer));
tokenizer.NextToken();
break;
case "AUTHORITY":
tokenizer.ReadAuthority(out authority, out authorityCode);
//tokenizer.ReadToken("]");
break;
}
ct = tokenizer.NextToken();
}
//This is default axis values if not specified.
if (axes.Count == 0)
{
axes.Add(new AxisInfo("X", AxisOrientationEnum.East));
axes.Add(new AxisInfo("Y", AxisOrientationEnum.North));
}
var projectedCS = new ProjectedCoordinateSystem(geographicCS.HorizontalDatum, geographicCS, unit as LinearUnit, projection, axes, name, authority, authorityCode, string.Empty, string.Empty, string.Empty);
return(projectedCS);
}
