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The projection engine in MapObjects is different than the projection engine in ArcObjects. It does reference epsg ids.
For your problem, can you send me the data (kcoffin@esri.com) and I'll look at it. I know that the ellipsoidal Transverse Mercator projection was accurate to about 15 degrees both sides of the central meridian, but before I comment on your problem, I'd like to see your data. (It recently was changed from this) (Most/All ellipsoidal TM zones are smaller than this).
Datum Transformations
It also supports Bursa Wolf, Coordinate Frame, NADCON, HARN, Geocentric translation, Geographic Offset. FOr ED50 there are several reference datums with transformations (called a ReferencedDatum) within the resource file GeodeticDB.txt. (com.esri.mo2.res.gdb)
This is where all the predefined geodetic objects are.
ED50,"GDB957","", 8033, MOLODENSKY, -87, -98, -121
ED50-BURSA,"GDB958","", 8237, BURSA, -89.5, -93.8, -123.1, 0, 0, 0.156, 1.2
ED50-WESTERN,"GDB959","", 8034, MOLODENSKY, -87, -96, -120
ED50-IRELAND,"GDB960","", 8038, MOLODENSKY, -86, -96, -120
ED50-UK,"GDB961","", 0, MOLODENSKY, -86, -96, -120
ED50-CYPRUS,"GDB962","", 8036, MOLODENSKY, -104, -101, -140
ED50-EGYPT,"GDB963","", 8037, MOLODENSKY, -130, -117, -151
ED50-MIDDLE EAST,"GDB964","", 8035, MOLODENSKY, -103, -106, -141
ED50-IRAN,"GDB965","", 8041, MOLODENSKY, -117, -132, -164
ED50-IRAN-ED77,"GDB966","", 8492, BURSA, -110.33, -97.73, -119.85, -0.3423, -1.1634, -0.2715, 0.063
ED50-GREECE,"GDB967","", 8040, MOLODENSKY, -84, -95, -130
ED50-GREECE-2,"GDB968","", 8372, MOLODENSKY, -86, -92.2, -127.5
ED50-SARDINIA,"GDB969","", 8042, MOLODENSKY, -97, -103, -120
ED50-SICILY,"GDB970","", 8043, MOLODENSKY, -97, -88, -135
ED50-MALTA,"GDB971","", 8044, MOLODENSKY, -107, -88, -149
ED50-NORWAY/FIN,"GDB972","", 8039, MOLODENSKY, -87, -95, -120
ED50-PORT/SPAIN,"GDB973","", 8045, MOLODENSKY, -84, -107, -120
ED50-TUNISIA,"GDB974","", 8148, MOLODENSKY, -112, -77, -145
ED50-FRANCE,"GDB975","", 8184, MOLODENSKY, -84, -97, -117
The CoordSysTreeframe allows you to select different datums. I enclose some sample code to show how to use it. Also I enclose the sample code the calculator and the projection editor.
Kerry
kcoffin@esri.com |