Projecting Gauss Kruger to Geographic or UTM

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Projecting Gauss Kruger to Geographic or UT...	John Mickelson	Jan 03, 2006
Re: Projecting Gauss Kruger to Geographic o...	Melita Kennedy	Jan 03, 2006

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Subject	Projecting Gauss Kruger to Geographic or UTM
Author	John Mickelson
Date	Jan 03, 2006
Message	Hi, I've been stumped with projecting some data from Uruguay, which has been sent as residing in: Gauss Kruger (a variant of TM). PROJCS["Pulkovo_1995_GK_Zone_22" GEOGCS["GCS_Pulkovo_1995" DATUM["D_Pulkovo_1995" SPHEROID["Krasovsky_1940",6378245.0,298.3]] PRIMEM["Greenwich",0.0] UNIT["Degree",0.0174532925199433]] PROJECTION["Gauss_Kruger"] PARAMETER["False_Easting",22500000.0] PARAMETER["False_Northing",0.0] PARAMETER["Central_Meridian",129.0] PARAMETER["Scale_Factor",1.0] PARAMETER["Latitude_Of_Origin",0.0] UNIT["Meter",1.0]] and trying to get it into either (or ideally both) Geographic WGS84 and\or UTM Zone 22S WGS84 I've been trying the following: (any help is appreciated... ArcGIS "Project" seems to run, but the output Shapefiles end up corrupted).
	Input Coordinate System: Name: Pulkovo_1995_GK_Zone_22 POSC: 20022 Unit: Meter Geographic CSYS: GCS_Pulkovo_1995 Datum: D_Pulkovo_1995 Prime Meridian: Greenwich False Easting: 22500000 False Northing: 0 Base Projection: Gauss_Kruger Central_Meridian: 129.0 Central_Parallel: 0.0 Scale_Factor: 1.0 Input Geographic Transformation: none Output Geographic Transformation: none Output Coordinate System: Name: WGS_1984_UTM_Zone_22S POSC: 32722 Unit: Meter Geographic CSYS: GCS_WGS_1984 Datum: D_WGS_1984 Prime Meridian: Greenwich False Easting: 500000 False Northing: 10000000 Base Projection: Transverse_Mercator Central_Meridian: -51.0 Central_Parallel: 0.0 Scale_Factor: 0.9996 or Output Coordinate System: Name: WGS_1984_UTM_Zone_22S POSC: 32722 Unit: Meter Geographic CSYS: GCS_WGS_1984 Datum: D_WGS_1984 Prime Meridian: Greenwich False Easting: 500000 False Northing: 10000000 Base Projection: Transverse_Mercator Central_Meridian: -51.0 Central_Parallel: 0.0 Scale_Factor: 0.9996

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Subject	Re: Projecting Gauss Kruger to Geographic or UTM
Author	Melita Kennedy
Date	Jan 03, 2006
Message	For the rest of you, if you're interested... John and I have talked off-list. The data's definitely not in GK zone 22. The term Gauss-Kruger is used as a map projection name, like Albers, and as a projected or grid coordinate system, like UTM or State Plane. Gauss-Kruger, the map projection, is the same as Transverse Mercator. He's tried defining the data as UTM zone 22S, but I think it's still not quite lining up. I found a reference in Cliff Mugnier's PE&RS column that Uruguay uses a central meridian of 55 48 W, but no other parameters are listed. Some other websites appear to state that the other "UTM" parameters are used, although data is based on the Yacare geographic coordinate system, and there's a datum transformation. Melita
	Melita Kennedy ESRI Product Specialist