[OSRS-PROJ] Error when forward projection with a polar stereographic projecti on.. Please help.

[Frank Warmerdam]

Ray Bryan E 2Lt 314 OSS/OSW wrote:
> I have tried a forward projection with a stereographic projection with no luck.
> 
> Are there any suggestions?
> 
> Here is what I entered in the command prompt.
> 
> proj +proj=stere +lat_ts=30d00N +lat_0=90 +lon_0=90d00W +k_0=1 +x_0=200 +y_0=200
> 
> Here is the error I'm getting...
> 
> projection initialization failure
> cause: major axis or radius = 0 or not given
> program abnormally terminated
> 
> Here is what I found on the remotesensing.org website for a stereographic projection.
>  +proj=stere +lat_ts=/Latitude at natural origin/ 
>               +lat_0=90
>               +lon_0=/Longitude at natural origin/
> 	      +k_0=/Scale factor at natural origin/ (normally 1.0)
>               +x_0=/False Easting/
>               +y_0=/False Northing/
> 
> I'm trying to do a forward projection with a polar stereographic projection.

Bryan,

You also need an ellipse definition.  This requirement is "assumed" in much
of the documentation.

Try:
proj +proj=stere +lat_ts=30d00N +lat_0=90 +lon_0=90d00W +k_0=1 +x_0=200 +y_0=200 +ellps=WGS84

By the way, those are pretty odd x_0 and y_0 values.  Is the value
easting and northing really 200 meters?

Best regards,

-- 
---------------------------------------+--------------------------------------
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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