/// <summary>
/// Checks whether the values of this instance is equal to the values of another instance.
/// Only parameters used for coordinate system are used for comparison.
/// Name, abbreviation, authority, alias and remarks are ignored in the comparison.
/// </summary>
/// <param name="obj"></param>
/// <returns>True if equal</returns>
public override bool EqualParams(object obj)
{
if (!(obj is ProjectedCoordinateSystem))
{
return(false);
}
ProjectedCoordinateSystem pcs = obj as ProjectedCoordinateSystem;
if (pcs.Dimension != this.Dimension)
{
return(false);
}
for (int i = 0; i < pcs.Dimension; i++)
{
if (pcs.GetAxis(i).Orientation != this.GetAxis(i).Orientation)
{
return(false);
}
if (!pcs.GetUnits(i).EqualParams(this.GetUnits(i)))
{
return(false);
}
}
return(pcs.GeographicCoordinateSystem.EqualParams(this.GeographicCoordinateSystem) &&
pcs.HorizontalDatum.EqualParams(this.HorizontalDatum) &&
pcs.LinearUnit.EqualParams(this.LinearUnit) &&
pcs.Projection.EqualParams(this.Projection));
}
/// <summary>
///
/// </summary>
/// <param name="tokenizer"></param>
/// <returns></returns>
private static IProjectedCoordinateSystem 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");
IGeographicCoordinateSystem geographicCS = ReadGeographicCoordinateSystem(tokenizer);
tokenizer.ReadToken(",");
IProjection projection = ReadProjection(tokenizer);
IUnit unit = ReadLinearUnit(tokenizer);
string authority = String.Empty;
long authorityCode = -1;
tokenizer.NextToken();
List<AxisInfo> axes = new List<AxisInfo>(2);
if (tokenizer.GetStringValue() == ",")
{
tokenizer.NextToken();
while (tokenizer.GetStringValue() == "AXIS")
{
axes.Add(ReadAxis(tokenizer));
tokenizer.NextToken();
}
if (tokenizer.GetStringValue() == "AUTHORITY")
{
tokenizer.ReadAuthority(ref authority, ref authorityCode);
tokenizer.ReadToken("]");
}
}
//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));
}
IProjectedCoordinateSystem projectedCS = new ProjectedCoordinateSystem(geographicCS.HorizontalDatum, geographicCS, unit as LinearUnit, projection, axes, name, authority, authorityCode, String.Empty, String.Empty, String.Empty);
return projectedCS;
}
