[Gdal-dev] reading linear units from GeoTIFF broken?

[Frank Warmerdam]

Vladimir Slepnev wrote:
> write it into a newly created GeoTIFF file through GDAL (SetProjection()),
> here's a piece of listgeo info for the newly written file:
> 
>    Keyed_Information:
>       GTModelTypeGeoKey (Short,1): ModelTypeProjected
>       GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
>       GTCitationGeoKey (Ascii,33): "UTM Zone 13, Northern Hemisphere"
>       GeographicTypeGeoKey (Short,1): GCS_WGS_84
>       ProjectedCSTypeGeoKey (Short,1): User-Defined
>       ProjectionGeoKey (Short,1): Proj_UTM_zone_13N
>       ProjLinearUnitsGeoKey (Short,1): Linear_Foot
>       End_Of_Keys.
>    End_Of_Geotiff.

Vladimir,

I get the same results in the GeoTIFF file.

> read the same file through GDAL, get the WKT projection string
> (GetProjectionRef()):
> 
> PROJCS["unnamed",GEOGCS["WGS
> 84",DATUM["WGS_1984",SPHEROID[,6378137,298.2572235630016,AUTHORITY["EPSG",70
> 30]],AUTHORITY["EPSG",6326]],PRIMEM["Greenwich",0],UNIT["degree",0.017453292
> 5199433],AUTHORITY["EPSG",4326]],PROJECTION["Transverse_Mercator"],PARAMETER
> ["latitude_of_origin",0],PARAMETER["central_meridian",-105],PARAMETER["scale
> _factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing
> ",0],UNIT["unknown",1]]

For me the unit is read back properly.  I suspect the new EPSG 6.2.2 .csv
files are not being found correctly.  Have you done a 'make install'?  If
not, what is your GEOTIFF_CSV set to?   You can likely work around this
by defining the GEOTIFF_CSV environment variable and pointing it to your
gdal/data directory, but the default situation is that the .csv files
should be installed in /usr/local/share/gdal and that the default search
rules in GDAL should find them there.

It would appear that isn't happening in your case.

 > Once again, sorry for the inconvenience...
 > our correspondence seems to be a major part of gdal-dev by now :-)
 > And thanks a lot for your help with all this stuff.

No sweat.  You are helping me fix bugs, and improve the driver with very
cogent bug reports.

Best regards,

-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | Geospatial Programmer for Rent