[Gdal-dev] gdal_translate Basic Usage / UTM to latlong

[Tim Osborn]

OK...this is what's going on.....

I'm pretty sure the image is projected in the Wisconsin Transverse Mercator
coordinate system WTM83.  You can read about it at
http://www.dnr.state.wi.us/maps/gis/wtm8391.html.  They list the parameters
there and an email address you can request a prj file.  WTM83 is not the
same as regular old UTM NAD83.  The EPSG number code for WTM83 is 3070 and
the code for WTM83(HARN) is 3071.

Here are the parameters for WTM83:

Map Projection Name: Transverse Mercator

Longitude of Central Meridian: -90 degrees West

Scale Factor at Central Meridian: 0.9996

Latitude of Projection Origin: 0 degrees

False Easting: 520,000

False Northing: -4,480,000

Unit: Meter

Using these parameters, your expected lat long for the center of the image
and what gdalinfo reports are very close.

Tim
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