Hi André, thank you for your response. I am not using EPSG:900913 anywhere
I got some img files someone else processed in arcgis and I am processing them this way: gdal_translate -of GTIFF -co "COMPRESS=LZW" -scale 0 255 0 255 -ot Byte input.img input.tif gdalwarp -t_srs "EPSG:3857" input.tif output_p.tif gdal2tiles.py output_p.tif I tried forcing the source projection during warp this way gdalwarp -s_srs "EPSG:22184" -t_srs "EPSG:3857" input.tif output_p.tif I am not sure about source projection, I found it out doing: gdalinfo -proj4 input.img and searching for the proj4 string in the internet. The image is actually from the zone of projection EPSG:22184 so I believe is ok. In what point of the process you say I should be forcing with a_srs? Thanks! Marcela On Tue, May 27, 2014 at 11:53 AM, Andre Joost <[email protected]>wrote: > Am 27.05.2014 05:31, schrieb Marcela Campo: > > Hi, >> I am trying to use gdal2tiles with a set of geotiff and I get the >> following error >> >> ERROR 6: EPSG PCS/GCS code 900913 not found in EPSG support files. Is >> this >> a valid >> EPSG coordinate system? >> ERROR 6: No translation for an empty SRS to PROJ.4 format is known. >> >> >> I have already transformed to projection EPSG:3857, here is the gdalinfo >> output for one of the files >> > > the command generates the tiles, but as the images appear a bit shifted I >> wonder if it somewhat misinterpreted the projection. >> >> > Instead of reprojecting to EPSG:900913 (which will place the points on the > same spot on the globe), try to assign the projection with -a_srs. This > will effectively shift the points. > > If the shift goes in the wrong direction, try EPSG:3395. This is the > projection on a ellipsoid rather than a sphere. > > HTH, > André Joost > > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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