<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Following Frank's suggestion, and in accordance with the web page <font class="Apple-style-span" face="Courier">GDAL Utilities</font> <font class="Apple-style-span" face="Courier"><a href="http://www.gdal.org/gdal_utilities.html">http://www.gdal.org/gdal_utilities.html</a></font> <font class="Apple-style-span" face="Courier">Creating New Files</font></div><div>I issued these GDAL commands</div><div><br></div><div><div><font class="Apple-style-span" face="Courier">$ gdal_translate --version</font></div><div><font class="Apple-style-span" face="Courier">GDAL 1.7.2, released 2010/04/23</font></div></div><div><div><font class="Apple-style-span" face="Courier">$ gdal_translate -of GTiff -ot Uint16 -a_srs NAD83_UTM18N.wkt in.tif out.tif</font></div></div><div><div><font class="Apple-style-span" face="Courier">$ gdal_translate -of GTiff -ot Uint16 -a_srs EPSG:26918 in.tif out.tif</font></div><div>The two <font class="Apple-style-span" face="Courier">out.tif</font> files created are identical.</div></div><div><br></div><div><font class="Apple-style-span" face="Courier">gdalinfo</font> shows that <font class="Apple-style-span" face="Courier">out.tif</font> has the expected values for <font class="Apple-style-span" face="Courier">PROJCS</font> through <font class="Apple-style-span" face="Courier">AUTHORITY</font>, including</div><div><font class="Apple-style-span" face="Courier"><span class="Apple-tab-span" style="white-space:pre"> </span>UNIT["metre",1,</font></div><div>but <font class="Apple-style-span" face="Courier">gdalinfo</font> shows <font class="Apple-style-span" face="Courier">out.tif</font> still has latitude longitude values for Origin and Pixel Size </div><div><div><font class="Apple-style-span" face="Courier">Origin = (-78.000555555559998,40.000555555555515)</font></div><div><font class="Apple-style-span" face="Courier">Pixel Size = (0.000092592592593,-0.000092592592593)</font></div></div><div>rather than the expected Origin and Pixel Size values for NAD 1983, UTM Zone 18N of about</div><div><font class="Apple-style-span" face="Courier">Origin = (271500.000000000000000,4335000.000000000000000)</font></div><div><div><font class="Apple-style-span" face="Courier">Pixel Size = (38.385826771653548,-38.385826771653548)</font></div></div><div><br></div><div>This Origin and Pixel Size difference prevents <font class="Apple-style-span" face="Courier">out.tif</font> 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 <font class="Apple-style-span" face="Courier">out.tif</font> has Origin and Pixel Size values in UTM, rather than lat/long?</div><div>Greg</div></body></html>