Zoltan, > Hi, > I've been struggling to get some 3200 orthos mosaicked and tiled. > They are very old and have really bad projection definitions, pixel > sizes and metadata funnies. > I'm down to the last 261, and have hit a brick wall. > Given that gdalwarp works on this image when I leave out s_srs and t_srs > (see below), I'm not sure if this is a bug related hiccough or a proj > issue. > > I have compiled the latest "GDAL 2.1.1, released 2016/07/07" myself, on > Ubuntu 16.04.1 Desktop: Linux gl05 4.4.0-36-generic #55-Ubuntu SMP Thu > Aug 11 18:01:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux > > > > I get the following error from gdalwarp: > > ERROR 6: Unable to load PROJ.4 library (libproj.so), creation of > OGRCoordinateTransformation failed.
Hum, if you get this message, then reprojection should never succeed. How did you compile GDAL with ./configure --with-static-proj4 or without it ? If without it, you must be sure to have the development package of proj installed so that proj.so links to proj.so.1 or proj.so.9 or whatever the soname of your proj is. > > I have tried various different gdalwarp parameters - even leaving > gdalwarp to sense in input projection and me only specifying the output > projection. > If I leave out both s_srs and t_srs then gdalwarp does work but > obliviously does not reproject to Lo19. > I have even tried feeding the output of this redundant gdalwarp into a > gdalwarp with t_srs, but no success. > > Specifying only t_srs (as above) on many other orthos on Lo17 & Lo21 > does work so it is likely that the way this projection is embedded in > this ortho is the problem. Yes, the way ER Mapper encodes the projection is non-standard and thus GDAL reports a LOCAL_CS that cannot be used to automatically get a proj.4 string. GDAL has some handling for some of those non-standard encodings, but not for your ones, so overriding it with -s_srs is needed. > I have tried stripping it out with gdal_edit.py but haven't gotten that > right yet. > > Anyone with pointers or ideas on this? +datum=Hartebeesthoek94 is not recognized by proj.4. Why not using EPSG:2049 instead or the proj.4 expension ? I also see that gdalsrsinfo EPSG:2049 expands to PROJ.4 : '+proj=tmerc +lat_0=0 +lon_0=21 +k=1 +x_0=0 +y_0=0 +axis=wsu +ellps=WGS84 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs ' So note the +axis=wsu parameter for the south-orientated variant Or perhaps this doesn't make sense in your context of producing a GeoTIFF, so in that case you might just want to use the above proj.4 string without +axis=wsu. Note that for proj the Hartebeesthoek94 datum is equivalent to WGS84. Even > > My last effort before email this list is below, as is the gdalinfo output. > > Thanks in advance, > Zoltan > > gdalwarp -s_srs '+proj=tmerc +lat_0=0 +lon_0=21 +k=1 +x_0=0 +y_0=0 > +datum=Hartebeesthoek94 +units=m +no_defs' \ > -t_srs '+proj=tmerc +lat_0=0 +lon_0=19 +k=1 +x_0=0 +y_0=0 > +datum=WGS84 +units=m +no_defs' \ > -r cubicspline -multi -overwrite -of GTiff -co TFW=YES -co > COMPRESS=JPEG -co JPEG_QUALITY=75 -tr 0.75 -0.75 \ > /mnt/sdb1/used_images/dwa_2000/3220/3220CC01.tif \ > /mnt/sda1/gisdata/raster/used_2016/dwa_2000/3220/3220CC01.tif > # > # > gdalinfo /mnt/sdb1/used_images/dwa_2000/3220/3220CC01.tif > # > Driver: GTiff/GeoTIFF > Files: /mnt/sdb1/used_images/dwa_2000/3220/3220CC01.tif > Size is 6729, 7720 > Coordinate System is: > LOCAL_CS[" Geocoding information not available Projection Name = WGS > 1984 Lo21 Units = meters GeoTIFF Units = meters", > UNIT["metre",1, > AUTHORITY["EPSG","9001"]]] > Origin = (-93872.189308887900552,-3625321.216973003931344) > Pixel Size = (0.750000000000000,-0.750000000000000) > Metadata: > AREA_OR_POINT=Area > TIFFTAG_DOCUMENTNAME=hetotiff > TIFFTAG_IMAGEDESCRIPTION=ER Mapper 6.4 hetotiff > TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch) > TIFFTAG_SOFTWARE=IMAGINE TIFF Support > Copyright 1991 - 1999 by ERDAS, Inc. All Rights Reserved > @(#)$RCSfile: etif.c $ $Revision: 1.9.1.3 $ $Date: 2002/07/29 15:39:06EDT $ > TIFFTAG_XRESOLUTION=1 > TIFFTAG_YRESOLUTION=1 > Image Structure Metadata: > INTERLEAVE=PIXEL > Corner Coordinates: > Upper Left ( -93872.189,-3625321.217) > Lower Left ( -93872.189,-3631111.217) > Upper Right ( -88825.439,-3625321.217) > Lower Right ( -88825.439,-3631111.217) > Center ( -91348.814,-3628216.217) > Band 1 Block=6729x1 Type=Byte, ColorInterp=Red > Band 2 Block=6729x1 Type=Byte, ColorInterp=Green > Band 3 Block=6729x1 Type=Byte, ColorInterp=Blue -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
