[GRASS-user] decoding esri file format

[Helmut Kudrnovsky]

>Driver: GTiff/GeoTIFF
>Files:
/Volumes/Gigantosaurus/BP/BP_MAHTRU80/background/ODNRmines/TL024/TL024.tif
>Size is 24888, 15040
>Coordinate System is:
>LOCAL_CS["unnamed", 
                     ^^^^^^

>I have a zip file provided by a US state agency that was 'georeferenced
within ArcGIS 10' in EPSG 3735

if you are sure that all your data is in EPSG 3735, you can try to import
the tiff with r.in.gdal -o into an appropiate grass location:

-o Override projection (use location's projection)
(http://grass.osgeo.org/grass64/manuals/r.in.gdal.html)

if you want to assign e.g. EPSG 3735 to the tiff, you can to this with
gdal_translate:

gdal_translate -a_srs EPSG:3735 in.tif out.tif

-a_srs srs_def: Override the projection for the output file. The srs_def may
be any of the usual GDAL/OGR forms, complete WKT, PROJ.4, EPSG:n or a file
containing the WKT. 
(http://www.gdal.org/gdal_translate.html)

but if you are not sure about the tif's coordinate system, ask the data
provider for better data...

HTH



-----
best regards
Helmut
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