/// <summary>
/// Computes the Geodetic coordinate reference system.
/// </summary>
/// <returns>The Geodetic coordinate reference system.</returns>
/// <exception cref="System.IO.InvalidDataException">Geodetic coordinate reference system code is invalid.</exception>
private GeographicCoordinateReferenceSystem ComputeGeodeticCoordinateReferenceSystem()
{
Int32 code = Convert.ToInt32(_currentGeoKeys[GeoKey.GeodeticCoordinateReferenceSystemType]);
// EPSG geodetic coordinate reference system codes
if (code < 32767)
{
GeographicCoordinateReferenceSystem referenceSystem = GeographicCoordinateReferenceSystems.FromIdentifier("EPSG::" + code).FirstOrDefault();
if (referenceSystem == null)
{
return(new GeographicCoordinateReferenceSystem("EPSG::" + code, "undefined", CoordinateSystems.EllipsoidalLatLonD, GeodeticDatums.WGS84, AreasOfUse.World));
}
return(referenceSystem);
}
// user-defined geodetic coordinate reference system
if (code == Int16.MaxValue)
{
String citation = _currentGeoKeys[GeoKey.GeodeticCoordinateReferenceSystemCitation].ToString();
GeodeticDatum datum = ComputeGeodeticDatum();
UnitOfMeasurement angleUnit = ComputeAngularUnit();
CoordinateSystem coordinateSystem = new CoordinateSystem(CoordinateSystem.UserDefinedIdentifier, CoordinateSystem.UserDefinedName,
CoordinateSystemType.Ellipsoidal,
CoordinateSystemAxisFactory.GeodeticLatitude(angleUnit),
CoordinateSystemAxisFactory.GeodeticLongitude(angleUnit));
return(new GeographicCoordinateReferenceSystem(GeographicCoordinateReferenceSystem.UserDefinedIdentifier, GeographicCoordinateReferenceSystem.UserDefinedName,
citation, null, null, coordinateSystem, datum, null));
}
throw new InvalidDataException("Geodetic coordinate reference system code is invalid.");
}
private IReferenceSystem ResolveCoordinateReferenceSystem(string id)
{
if (string.IsNullOrEmpty(id))
{
return(GeographicCoordinateReferenceSystems.FromName("WGS84").FirstOrDefault());
}
IList <IReferenceSystem> systems = GeocentricCoordinateReferenceSystems.FromIdentifier(id).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = GeographicCoordinateReferenceSystems.FromIdentifier(id).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = GridReferenceSystems.FromIdentifier(id).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = ProjectedCoordinateReferenceSystems.FromIdentifier(id).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = VerticalCoordinateReferenceSystems.FromIdentifier(id).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
return(GeographicCoordinateReferenceSystems.FromName("WGS84").FirstOrDefault());
}
/// <summary>
/// Determines the ReferenceSystem from the Crs object.
/// </summary>
/// <param name="obj">The input crs object.</param>
/// <returns>The determined ReferenceSystem.</returns>
private IReferenceSystem GetReferenceSystem(CrsObject obj)
{
if (obj == null)
{
return(GeographicCoordinateReferenceSystems.FromName("WGS84").FirstOrDefault());
}
if (obj.Type == "name")
{
if (obj.Properties.ContainsKey("name"))
{
IList <IReferenceSystem> systems = GeocentricCoordinateReferenceSystems.FromIdentifier(obj.Properties["name"]).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = GeographicCoordinateReferenceSystems.FromIdentifier(obj.Properties["name"]).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = GridReferenceSystems.FromIdentifier(obj.Properties["name"]).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = ProjectedCoordinateReferenceSystems.FromIdentifier(obj.Properties["name"]).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
systems = VerticalCoordinateReferenceSystems.FromIdentifier(obj.Properties["name"]).ToList <IReferenceSystem>();
if (systems.Count > 0)
{
return(systems[0]);
}
throw new NotSupportedException("Not supported Coordinate Reference System: " + obj.Properties["name"]);
}
else
{
throw new IOException("Named Crs must have a \"name\" property with string value.");
}
}
else if (obj.Type == "link")
{
if (obj.Properties.ContainsKey("href"))
{
if (!obj.Properties.ContainsKey("type") || obj.Properties.ContainsKey("type") && obj.Properties["type"] == "esriwkt")
{
return(ReadReferenceSystemFromFile(obj.Properties["href"]));
}
else
{
throw new NotSupportedException("The given Reference System type is not supported.");
}
}
else
{
throw new InvalidDataException("Linked Crs must have an \"href\" property with string value.");
}
}
else
{
throw new NotSupportedException("Not supported Coordinate Reference System type: " + obj.Type);
}
}