I have a cartographic project in Greece. The raster data go back in' 50s and '60s. That time the geographic system that was used was HATT (hellenic azimuthial). As a result the most of my raster file use that strange grid. The greek military geography service has published a method for the transformation of the hatt grid data to Greek Grid (2100). This method uses 2nd degree polyonomial function as you can see bellow Where: Αx and Bx are factors given by GMS Χi, Yi the coordinates in HATT system and Ei,Ni the result coordinates in Greek Grid (epsg 2100). It a problem that i can solve easily in excel but i need to create a custom transformation to use with raster data. unfortunately CreateCustomGeoTransformation doesn't seem to support a custom equation only the following Geocentric_Translation, Molodensky, Molodensky_Abridged, Position_Vector, Coordinate_Frame, Molodensky_Badekas, NADCON, HARN, NTV2, Longitude_Rotation, Unit_Change, and Geographic_2D_Offset Any ideas?
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