[GRASS-user] Datum not recognized by GRASS

[Paul Kelly]

On Wed, 30 Jun 2010, Anders Gonçalves da Silva wrote:

> Hello all. I am trying to add a GeoTIFF to a project, but I keep getting the following message:
>
> --
> GRASS 6.4.0RC6 (pontal):~/Documents/Academic/Thesis/Archive/Sampling > gdalinfo pontal.TIF
> Driver: GTiff/GeoTIFF
> Files: pontal.TIF
> Size is 4337, 2727
> Coordinate System is:
> PROJCS["UTM Zone 23S",
>   GEOGCS["South_American_1969",
>       DATUM["South_American_1969",

This seems to be non-standard; the EPSG name should be 
South_American_Datum_1969 and then GRASS would pick it up correctly. 
Perhaps we need to add an exception in lib/proj/convert.c; unfortunately 
I'm just about to head away for a few days and don't have time right now.

Paul

>           SPHEROID["South American 1969",6378160,298.2500000654724]],
>       PRIMEM["Greenwich",0],
>       UNIT["degree",0.0174532925199433]],
>   PROJECTION["Transverse_Mercator"],
>   PARAMETER["latitude_of_origin",0],
>   PARAMETER["central_meridian",-45],
>   PARAMETER["scale_factor",0.9996],
>   PARAMETER["false_easting",500000],
>   PARAMETER["false_northing",10000000],
>   UNIT["unknown",1]]
> Origin = (280686.235600000014529,7573063.005800000391901)
> Pixel Size = (30.000000000000000,-30.000000000000000)
> Metadata:
> TIFFTAG_SOFTWARE=ERDAS IMAGINE
> AREA_OR_POINT=Area
> Image Structure Metadata:
> INTERLEAVE=PIXEL
> Corner Coordinates:
> Upper Left  (  280686.236, 7573063.006) ( 47d 7'24.05"W, 21d55'58.77"S)
> Lower Left  (  280686.236, 7491253.006) ( 47d 8'4.36"W, 22d40'17.64"S)
> Upper Right (  410796.236, 7573063.006) ( 45d51'49.82"W, 21d56'39.98"S)
> Lower Right (  410796.236, 7491253.006) ( 45d52'6.24"W, 22d41'0.39"S)
> Center      (  345741.236, 7532158.006) ( 46d29'51.35"W, 22d18'33.65"S)
> Band 1 Block=4337x5 Type=Byte, ColorInterp=Red
> Band 2 Block=4337x5 Type=Byte, ColorInterp=Green
> Band 3 Block=4337x5 Type=Byte, ColorInterp=Blue
>
> --
>
> I have tried to use gdalwarp to reset it to something that GRASS can read. While I get it to run, the projections are not lining up. In particular, it seems to be off by a few degrees to the East. Any help in fixing this would be greatly appreciated. Thank you.
>
> Anders._______________________________________________
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>