No, your command does _not_ specify ecw output. It is generating geotiff output with a '.ecw' file extension. You need to use the "-of <format>" argument. gdal_translate does not use file extensions to determine output file type, so if you do not use "-of", gdal_translate will generate a file in the _default_ format, which is geotiff.
Geotiff output: gdal_translate -a_srs EPSG:3078 in.ecw out.ecw ECW Output: gdal_translate -of ECW -a_srs EPSG:3078 in.ecw out.ecw Luke ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Lee Sent: Tuesday, 5 July 2011 5:32 AM To: Johan Van de Wauw Cc: [email protected] Subject: Re: [Ubuntu] ECW CRS definition 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. gdal_translate in.ecw out.ecw -a_srs EPSG:3078 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. On Mon, Jul 4, 2011 at 7:33 AM, Johan Van de Wauw <[email protected]> wrote: Have you tried specifying the output format? gdal_translate will create geotiff by default. Perhaps that is causing the problem: qgis thinks it is reading a ecw file, where in reality it's a geotiff So gdal_translate in.ecw out.tif -a_srs EPSG:3078 or gdal_translate in.ecw out.ecw -a_srs EPSG:3078 -of ECW On Sat, Jul 2, 2011 at 7:52 PM, Lee <[email protected]> wrote: > I've tried the QGIS-user listserv to no avail. Figured I'd try here, perhaps > at least I can get forwarded to the right one. > > I have an ECW that does not seem to want to accept a CRS definition. > Initially I was attempting to warp the ECW file from Michigan Georef to > NAD83 UTM zone 17. I got an error. > > ERROR 1: Unable to compute a transformation between pixel/line > and georeferenced coordinates for /home/lee/documents/gis/ > detroit/aerial/WYANDOTTE_NE/WYANDOTTE_NE.ecw. > There is no affine transformation and no GCPs > > QGIS shows a generated CRS that seems right for Michigan Georef, it just > does not seem to recognize that a CRS is there, so I cannot warp to the new > projection. Next, I tried manually assigning the CRS in question so I would > then be able to convert. > > gdal_translate in.ecw out.ecw -a_srs EPSG:3078 > > This creates a file, but one which is un-readable in qgis. > > I am not exactly sure which is the problem that needs fixing here. > Essentially, I just need to find a way to get this ECW file (in Michigan > Georef) as any format (in NAD83 UTM zone 17). So whatever suggestions you > have for accomplishing this, I am willing to try. > > Thanks for any help in advance. > > -- > all the best, > Lee > > _______________________________________________ > UbuntuGIS mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/ubuntu > http://trac.osgeo.org/ubuntugis/wiki > > -- all the best, Lee If you have received this transmission in error please notify us immediately by return e-mail and delete all copies. If this e-mail or any attachments have been sent to you in error, that error does not constitute waiver of any confidentiality, privilege or copyright in respect of information in the e-mail or attachments. Please consider the environment before printing this email. _______________________________________________ UbuntuGIS mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/ubuntu http://trac.osgeo.org/ubuntugis/wiki
