/// <summary>
/// Reads the reference system stored in the metafile stream.
/// </summary>
/// <returns>The reference system.</returns>
protected override IReferenceSystem ReadReferenceSystemInternal()
{
IReferenceSystem referenceSystem = null;
XElement referenceSystemElement = _document.Element("Dimap_Document").Element("Coordinate_Reference_System");
if (referenceSystemElement == null)
{
return(null);
}
// horizontal reference system based on type
XElement codeElement = referenceSystemElement.Element("Horizontal_CS").Element("HORIZONTAL_CS_CODE");
XElement nameElement = referenceSystemElement.Element("Horizontal_CS").Element("HORIZONTAL_CS_NAME");
switch (referenceSystemElement.Element("Horizontal_CS").Element("HORIZONTAL_CS_TYPE").Value)
{
case "GEOGRAPHIC":
if (codeElement == null)
{
codeElement = referenceSystemElement.Element("Horizontal_CS").Element("Geographic_CS").Element("GEOGRAPHIC_CS_CODE");
}
if (nameElement == null)
{
nameElement = referenceSystemElement.Element("Horizontal_CS").Element("Geographic_CS").Element("GEOGRAPHIC_CS_NAME");
}
if (codeElement != null)
{
referenceSystem = Geographic2DCoordinateReferenceSystems.FromIdentifier(codeElement.Value).FirstOrDefault();
}
if (referenceSystem == null && nameElement != null)
{
referenceSystem = Geographic2DCoordinateReferenceSystems.FromName(nameElement.Value).FirstOrDefault();
}
// TODO: process custom datums
break;
case "PROJECTED":
if (codeElement != null)
{
referenceSystem = ProjectedCoordinateReferenceSystems.FromIdentifier(codeElement.Value).FirstOrDefault();
}
if (referenceSystem == null && nameElement != null)
{
referenceSystem = ProjectedCoordinateReferenceSystems.FromName(nameElement.Value).FirstOrDefault();
}
// TODO: process custom projections
break;
// TODO: process other horizontal reference system information
}
// TODO: process vertical reference system information
return(referenceSystem);
}
/// <summary>
/// Reads the reference system stored in the metafile stream.
/// </summary>
/// <returns>The reference system.</returns>
protected override IReferenceSystem ReadReferenceSystemInternal()
{
ReadContent();
if (_metadata.ContainsKey("MAP_PROJECTION"))
{
return(ProjectedCoordinateReferenceSystems.FromName(_metadata["MAP_PROJECTION"]).FirstOrDefault());
}
return(Geographic2DCoordinateReferenceSystems.FromName(_metadata["DATUM"]).FirstOrDefault());
}