[gdal-dev] gdalwarp error 6 issues

Thu Sep 1 12:37:00 PDT 2016

Hi Even,
Many thanks, will try gdal_edit.py permutations again over the weekend.

Tomorrow is a busy day.
Regards,
Zoltan

On 2016-09-01 21:12, Even Rouault wrote:
> Le jeudi 01 septembre 2016 19:41:18, Zoltan Szecsei a écrit :
>> Hi Even,
>> Long time no chat - Hope all is well with you. :-)
>>
>> When compiling GDAL, I just used all defaults, so it was just a
>> "straight" ./configure.
>>
>> The errant images are ENU on WGS84 Lo17 and Lo21, and I need to
>> reproject to same but Lo19
>> (They are on the fringes of Lo19)
>>
>> I tried gdal_edit.py to force a better representation of where those
>> images are, but no luck.
>> I used variations of the s-srs line below (ie: replacing HBK94 with
>> WGS84) and also 1 or 2 EPSG codes - but I was guessing the EPSG ones.
>>
>> Is there not a way to stamp out the existing proj info, and replace with
>> the desired source projection stanza using gdal_edit.py?
> "gdal_edit.py -a_srs srs_def foo.tif" where srs_def is either a proj.4 string
> or EPSG:xxxx code. I've just tried it on a GeoTIFF with a LOCAL_CS originally
> and this worked.
>
>> I've got a batch run in at the moment so don't want to fiddle until that
>> has finished.
>> I will also recompile with --with-static-proj4.
>>
>> Thanks for the pointers.
>> Regards,
>> Zoltan
>>
>> On 2016-09-01 18:40, Even Rouault wrote:
>>> 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