Yes. The command which generates the error was one in which ecw was specified as both the input and the output. My initial email contains the commands utilized.<br><br>gdal_translate in.ecw out.ecw -a_srs EPSG:3078<br><br>
Specifically, it seems that (a) gdal does not recognize there is a spatial system associated with this file and (b) won't let me assign one on my own.<br><br><div class="gmail_quote">On Mon, Jul 4, 2011 at 7:33 AM, Johan Van de Wauw <span dir="ltr"><<a href="mailto:johan.vandewauw@gmail.com">johan.vandewauw@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">Have you tried specifying the output format? gdal_translate will<br>
create geotiff by default. Perhaps that is causing the problem: qgis<br>
thinks it is reading a ecw file, where in reality it's a geotiff<br>
<br>
So<br>
gdal_translate in.ecw out.tif -a_srs EPSG:3078<br>
or<br>
gdal_translate in.ecw out.ecw -a_srs EPSG:3078 -of ECW<br>
<div><div></div><div class="h5"><br>
<br>
<br>
On Sat, Jul 2, 2011 at 7:52 PM, Lee <<a href="mailto:muellerl@gmail.com">muellerl@gmail.com</a>> wrote:<br>
> I've tried the QGIS-user listserv to no avail. Figured I'd try here, perhaps<br>
> at least I can get forwarded to the right one.<br>
><br>
> I have an ECW that does not seem to want to accept a CRS definition.<br>
> Initially I was attempting to warp the ECW file from Michigan Georef to<br>
> NAD83 UTM zone 17. I got an error.<br>
><br>
> ERROR 1: Unable to compute a transformation between pixel/line<br>
> and georeferenced coordinates for /home/lee/documents/gis/<br>
> detroit/aerial/WYANDOTTE_NE/WYANDOTTE_NE.ecw.<br>
> There is no affine transformation and no GCPs<br>
><br>
> QGIS shows a generated CRS that seems right for Michigan Georef, it just<br>
> does not seem to recognize that a CRS is there, so I cannot warp to the new<br>
> projection. Next, I tried manually assigning the CRS in question so I would<br>
> then be able to convert.<br>
><br>
> gdal_translate in.ecw out.ecw -a_srs EPSG:3078<br>
><br>
> This creates a file, but one which is un-readable in qgis.<br>
><br>
> I am not exactly sure which is the problem that needs fixing here.<br>
> Essentially, I just need to find a way to get this ECW file (in Michigan<br>
> Georef) as any format (in NAD83 UTM zone 17). So whatever suggestions you<br>
> have for accomplishing this, I am willing to try.<br>
><br>
> Thanks for any help in advance.<br>
><br>
> --<br>
> all the best,<br>
> Lee<br>
><br>
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><br>
><br>
</blockquote></div><br><br clear="all"><br>-- <br><div>all the best,</div>
<div>Lee</div><br>