Hi Pierre
I still use the DEM data I created several years ago. Thus I doubt it's a data
format problem. It's very likely
that it's a binary missmatch of the GDAL version. And that has to be reported
as a bug to SuSE.
Of course I always use the latest versions of the libraries because I compile
everything on my own. That
might be a short term soulution for you, too.
The projection error message is always a bit tricky. There are several ways to
define one and the same
projection with a different projection string. And even GDALs internal compare
tends to fail. Thus if you are
sure that the projection should be ok simply ignore the message.
HTH
Oliver
> Hello QLandkarteGT users,
>
> I am a long time very happy user of this wonderful software tool and I
> am most thankful to the developers of this gem for their excellent work.
>
> I just registered to this list because, for the last few months (since
> January or so), I have been bumping on the same weird problem with
> loading an SRTM DEM on the OpenSuSE 13.1 version. Apparently the problem
> appeared after upgrading from OpenSuSE 12.2 to 13.1 but it may be a
> simple coincidence (and the simultaneous upgrade from QLGT 1.7.4 to 1.7.6).
>
> More specifically, this is with QLGT version 1.7.6 x86_64 regularly
> updated from the Application:Geo repository (on "OpenSuSE Build
> Service"). FWIW, it uses Qt 4.8.5, GDAL 1.10.1 and PROJ 4.8.0.
>
> I usually always use the same tiled SRTM GeoTIFF DEM file that I created
> about 2 years ago following the instructions in the FAQ (don't remember
> what GDAL/PROJ versions it was back then). This file has always worked
> fine previously (albeit with a harmless warning about projection not
> matching map) and still does load and map elevations perfectly on the
> Windows version ("1.7.6.post" which uses Qt 4.8.4, GDAL 1.8.0 and PROJ
> 4.7.0).
>
> Currently, I assume that I may have a problem with the newer GDAL
> version on Linux. Unfortunately, I found no repository with older
> versions to revert back to 1.8.0. So I wanted to know whether I am alone
> with this problem or is anybody else also using this GDAL version
> (1.10.1) and also experiencing the same kind of problem with loading DEMs ?
>
>
> Some further details :
>
> Under Linux, whenever I try to load the DEM file, I get the (usually
> harmless) warning about the DEM projection not matching the current map,
> except that the DEM projection string reported in the message box is
> empty (while under Windows there is indeed a non-empty projection string
> reported in the dialog).
>
> I found out that my Linux "gdalinfo" has a "-proj4" switch to extract
> that projection string from the file, so I tried to run it on the
> command line and the reported projection string was indeed empty :
>
> ==BEGIN TRANSCRIPT========================================
>
> > gdalinfo -proj4 srtm.tif
>
> Driver: GTiff/GeoTIFF
> Files: srtm.tif
> Size is 11826, 11816
> Coordinate System is:
> LOCAL_CS["unnamed",
> GEOGCS["unnamed ellipse",
> DATUM["unknown",
> SPHEROID["unnamed",6378137,0],
> TOWGS84[3.458459520888726e-323,0,0,0,0,1,0]],
> PRIMEM["Greenwich",0],
> UNIT["degree",0.0174532925199433]],
> UNIT["metre",1]]
> PROJ.4 string is:
> ''
> Origin = (-46.383121164097140,6800200.793425155803561)
> Pixel Size = (112.966288047500555,-112.966288047500555)
> Metadata:
> AREA_OR_POINT=Area
> Image Structure Metadata:
> COMPRESSION=DEFLATE
> INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left ( -46.383, 6800200.793)
> Lower Left ( -46.383, 5465391.134)
> Upper Right ( 1335892.939, 6800200.793)
> Lower Right ( 1335892.939, 5465391.134)
> Center ( 667923.278, 6132795.964)
> Band 1 Block=256x256 Type=Int16, ColorInterp=Gray
> ==END TRANSCRIPT========================================
>
>
> Unfortunately, the GDAL version 1.8.0 bundled with QLGT for Windows does
> not yet provide this "-proj4" switch (was introduced in version 1.9
> apparently) but the projection information seems to be reported anyway
> (just not as a PROJ.4 string). Otherwise, the output of "gdalinfo" under
> Windows is fairly consistent with the above (except the "TOWGS84" line
> and the non-empty projection information) :
>
> ==BEGIN TRANSCRIPT========================================
> C:\>gdalinfo srtm.tif
> Driver: GTiff/GeoTIFF
> Files: srtm.tif
> Size is 11826, 11816
> Coordinate System is:
> PROJCS["unnamed",
> GEOGCS["unnamed ellipse",
> DATUM["unknown",
> SPHEROID["unnamed",6378137,0]],
> PRIMEM["Greenwich",0],------------------------------------------------------------------------------
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