[gdal-dev] gdal_translate -a_srs

[Greg Coats]

Following Frank's suggestion, and in accordance with the web page GDAL Utilities http://www.gdal.org/gdal_utilities.html Creating New Files
I issued these GDAL commands

$ gdal_translate --version
GDAL 1.7.2, released 2010/04/23
$ gdal_translate -of GTiff -ot Uint16 -a_srs NAD83_UTM18N.wkt in.tif out.tif
$ gdal_translate -of GTiff -ot Uint16 -a_srs EPSG:26918       in.tif out.tif
The two out.tif files created are identical.

gdalinfo shows that out.tif has the expected values for PROJCS through AUTHORITY, including
	UNIT["metre",1,
but gdalinfo shows out.tif still has latitude longitude values for Origin and Pixel Size  
Origin = (-78.000555555559998,40.000555555555515)
Pixel Size = (0.000092592592593,-0.000092592592593)
rather than the expected Origin and Pixel Size values for NAD 1983, UTM Zone 18N of about
Origin = (271500.000000000000000,4335000.000000000000000)
Pixel Size = (38.385826771653548,-38.385826771653548)

This Origin and Pixel Size difference prevents out.tif from being displayed by Qgis along with the original NAD 1983 UTM Zone 18N .tif. It is though the gdal_translate -a_srs process is only partially complete? What additional step is necessary so that out.tif has Origin and Pixel Size values in UTM, rather than lat/long?
Greg
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