Frank, Yes! Thank you. Greg On Jul 5, 2010, at 7:25 PM, Frank Warmerdam wrote:
> Greg Coats wrote: >> 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. > > The -a_srs switch assigns a new coordinate system. It does not reproject > the image. I think you want to use gdalwarp like: > > gdalwarp -t_srs EPSG:26918 in.tif out.tif > > Best regards, > -- > ---------------------------------------+-------------------------------------- > I set the clouds in motion - turn up | Frank Warmerdam, [email protected] > light and sound - activate the windows | http://pobox.com/~warmerdam > and watch the world go round - Rush | Geospatial Programmer for Rent > _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
