Getting UTM and stereographic projections to overlap

Frank Warmerdam warmerdam at POBOX.COM
Mon Oct 31 07:41:22 PST 2005


On 10/31/05, Trond Michelsen <trondmm-mapserver at crusaders.no> wrote:
> The stereographic point layer and all basemaps:
>
> PROJECTION
>   "proj=stere"
>   "lat_0=90"
>   "lon_0=0"
>   "lat_ts=60"
>   "a=6371000"
>   "b=6371000"
>   "units=m"
> END
>
> The UTM33-point layer and shapefile of Norway:
>
> PROJECTION
>   "proj=utm"
>   "zone=33"
>   "ellps=WGS84"
>   "datum=WGS84"
>   "units=m"
> END

Trond,

I have you considered misrepresenting the UTM data as
being on the spherical earth as well to avoid PROJ.4 trying
to apply an ellipsoid translation?

eg.
 PROJECTION
   "proj=utm"
   "zone=33"
   "a=6371000"
   "b=6371000"
   "units=m"
 END

Best regards,
--
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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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