[OSRS-PROJ] epsg code 21781 towgs values gone

[Frank Warmerdam]

Claude Philipona wrote:
> Hello,
> 
> Why did the towgs code disappeard in version 1.6 of the epsg file
> definition?
> 
> version 1.4, 2001/09/12 01:50:58
> <21781> +proj=omerc +lat_0=46.952405556 +lonc=7.439583333
> +alpha=90.000000000 +k=1.000000000 +x_0=600000.000 +y_0=200000.000
> +ellps=bessel +towgs84=660.077,13.551,369.344,2.484,1.783,2.939,5.66
> +units=m  no_defs <>
> 
> version 1.6, 2003/03/31 14:38:07
> <21781> +proj=omerc +lat_0=46.95240555555556 +lonc=7.439583333333333
> +alpha=90 +k=1 +x_0=600000 +y_0=200000 +ellps=bessel +units=m +no_defs
> no_defs <>
> 
> Claude Philipona

Claude,

The typical reason this would happen is that in upgrading to a newer EPSG
database a new TOWGS84 option became available.  The current translation
software, does not emit a towgs84 clause in the PROJ.4 file if there is more
than one transformation available in the EPSG database.

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


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