[Geotiff] Gauss Schreiber Transverse Mercator

[Frank Warmerdam]

Jean-Claude Repetto wrote:
> Hello,
> 
> Is this projection supported by libgeotiff ? I can't see it in the list 
> at http://www.remotesensing.org/geotiff/proj_list/
> 
> If yes, what is its WKT name ?
> 
> FYI, this projection, AKA Gauss-Laborde, is used in the Reunion island.

Jean-Claude,

I see this definition for PROJ.4 that may be a match:

<REUN47GAUSSL> +title=Reunion Gauss Laborde +proj=gstmerc 
+towgs84=789.5240,-626.4860,-89.9040,0.6006,76.7946,-10.5788,-32.324100 
+a=6378388.0000 +rf=297.0000000000000 +lat_0=-21.116666667 +lon_0=55.533333333 
+k_0=1.00000000 +x_0=160000.000 +y_0=50000.000 +units=m +no_defs <>

I do not see any CT_ code that likely corresponds with Gauss Schreiber
Transverse Mercator in the geo_ctrans.inc file so the short answer seems
to be "no", there is no accepted way of representing this projection
method.

You could still refer to the whole projected coordinate system by it's
EPSG code in a GeoTIFF file if there is one - you just couldn't define
it parametrically.

(IMHO)

Best regards,
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