To determine the model in use, refer to the datum_trf column in the user\csv\datumtrf.csv file. The datum and geoid model are named in the sqare brackets following the transform name as follows: name [datum_model:geoid] The datum_model is the name of the datum transformation model which will be in a file with extension .ll2 in the \etc directory. The geoid is the name of the geoid model which will be in a grid file with extension .grd in the \etc directory. If the geoid model is missing, this method will return <define>PJ_ELEVATION_NONE</define> and elevation coordinates will not be changed.

Return Value

Type: Int32
<define>PJ_ELEVATION</define>