Convert Latitude/Longitude to Easting/Northing Coordinates

The CoordSystem object in GeoMedia can perform among other things, coordinate conversion from latitude and longitude to easting and northing using its TransformPoint method. What is not clear from the GeoMedia Object Reference developer documentation is that the latitude and longitude coordinates must be passed in as radians, not degrees; there was no mention of the units at all. I was at a loss for a while wondering why the converted values were incorrect until I found some example code from the Intergraph web site showing the correct usage. In fact, there is also a UnitAndFormatSpec object that comes with the Coordinate System Services (PCSS) that can help you perform the latitude, longitude conversion to radians. Example C# code listing is shown below.

PCSS.CoordSystemsMgr coordSysMgr = null;

PCSS.CoordSystem coordSys = null;
PCSS.UnitAndFormatSpec spec = null;
bool isValid = false;
double x = 104.0, y = 4.0, z = 0.0;
double[] point = { 0, 0, 0 }; //the output easting, northing, height values

//Get a reference to the Coordinate Systems Manager class
//of the GeoMedia workspace
coordSysMgr = (PCSS.CoordSystemsMgr) this._document.CoordSystemsMgr;

//Create an instance of the UnitAndFormatSpec class
spec = (PCSS.UnitAndFormatSpec)this._application.CreateService("UnitAndFormatSpec");

//Convert the longitude to radians           
spec.ParseValueString(Intergraph.GeoMedia.PCSS.CSValueStringConstants.csvsLongitude, lng.ToString(), out x);

//Convert the latitude to radians           
spec.ParseValueString(Intergraph.GeoMedia.PCSS.CSValueStringConstants.csvsLatitude, lat.ToString(), out y);

//Get a reference to the coordinate system class
coordSys = coordSysMgr.CoordSystem;

//Check first to see if the conversion from latitude, longitude to 
// easting, northing is valid
coordSys.IsTransformationValid(Intergraph.GeoMedia.PCSS.CSPointConstants.cspLLU, 1, Intergraph.GeoMedia.PCSS.CSPointConstants.cspENU, 1, out isValid);

//If the conversion is valid, then perform the actual conversion
//from latitude, longitude to easting, northing.
if (isValid == true)
{
   coordSys.TransformPoint(Intergraph.GeoMedia.PCSS.CSPointConstants.cspLLU, 1, Intergraph.GeoMedia.PCSS.CSPointConstants.cspENU, 1, ref x, ref y, ref z);
   point[0] = x;
   point[1] = y;
   point[2] = z;
}