Gauss Schreiber Transverse Mercator

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Gauss Schreiber Transverse Mercator

Jean-Claude Repetto
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.

Thanks,
Jean-Claude


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Re: 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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I set the clouds in motion - turn up   | Frank Warmerdam, [hidden email]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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Re: Gauss Schreiber Transverse Mercator

Jean-Claude Repetto
On 11/10/10 20:03, Frank Warmerdam wrote:

> 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.

It seems that there is a patch waiting in a GDAL Trac ticket, that
should add this missing support :
http://trac.osgeo.org/gdal/ticket/2664

Could you apply it ?

Thanks,
Jean-Claude
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Re: Gauss Schreiber Transverse Mercator

Jean-Claude Repetto
Le 10/11/2010 22:38, Jean-Claude REPETTO a écrit :

> On 11/10/10 20:03, Frank Warmerdam wrote:
>
>> 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.
>
> It seems that there is a patch waiting in a GDAL Trac ticket, that
> should add this missing support :
> http://trac.osgeo.org/gdal/ticket/2664
>
> Could you apply it ?

Hello,

I have found that GDAL supports this projection, its name is :
Gauss_Schreiber_Transverse_Mercator .

Best regards,
Jean-Claude


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