public GeographicCoordSystem(WktItem wktItem)
{
_name = wktItem.Value.Split(',')[0].Replace("\"", string.Empty);
_angularUnit = new AngularUnit(wktItem.GetWktItem("UNIT"));
_primeMeridian = new PrimeMeridian(wktItem.GetWktItem("PRIMEM"));
_datum = new Datum(wktItem.GetWktItem("DATUM"));
_oracleSpatialSRID = int.MinValue;
}
public ISpatialReference Parse(string wkt)
{
_rootWktItem = new WktSpliter().Split(wkt);
bool isPrj = IsProjectionCoordSystem();
bool isGeo = IsGeographicCoordSystem();
if (!isPrj && !isGeo)
{
throw new Exception("本系统只支持地理坐标系统与投影坐标系统,坐标系统\"" + _rootWktItem.Name + "\"不受支持。");
}
IGeographicCoordSystem _geoCoordSystem = null;
IProjectionCoordSystem _prjCoordSystem = null;
_geoCoordSystem = ParseGeoCoordSystem(_rootWktItem.GetWktItem(cstGeoCoordSystem));
_prjCoordSystem = ParseProjectionCoordSystem(_rootWktItem.GetWktItem(cstPrjCoordSystem));
return(new SpatialReference(_geoCoordSystem, _prjCoordSystem));
}
/*
* PROJECTION["Mercator"],
* PARAMETER["False_Easting",0.0],
* PARAMETER["False_Northing",0.0],
* PARAMETER["Central_Meridian",0.0],
* PARAMETER["Standard_Parallel_1",0.0],
* UNIT["Meter",1.0]
*/
protected override IProjectionCoordSystem ParseProjectionCoordSystem(WktItem wktItem)
{
if (wktItem == null)//Is Graphics Coordinate System
{
return(null);
}
string name = wktItem.Value.Split(',')[0].Replace("\"", string.Empty);
NameMapItem prjName = GetPrjName(wktItem.GetWktItem("PROJECTION"));
if (prjName == null)
{
throw new Exception("投影坐标系统\"" + name + "\"没有在系统中预先配置。");
}
NameValuePair[] parameters = GetPrjParameters(wktItem.GetWktItems("PARAMETER"));
AngularUnit unit = new AngularUnit(wktItem.GetWktItem("UNIT"));
ProjectionCoordSystem prj = new ProjectionCoordSystem(prjName, parameters, unit);
prj.NameDes = name;
return(prj);
}
//DATUM["D_WGS_1984",
// SPHEROID["WGS_1984",6378137.0,298.257223563]
// ]
public Datum(WktItem wktItem)
{
Spheroid = new Spheroid(wktItem.GetWktItem("SPHEROID"));
Name = (wktItem.Value.Split(',')[0]).Replace("\"", string.Empty);
}