[SPAM] - Re: [OSRS-PROJ] Error projecting Geographic to UPS - Email found in subject

[Charles D. Van Dusen]

 Hi Frank

Thanks for the reply.

This from the proj manual:

Universal Polar Stereographic (UPS) Projection
Usage and options: +proj=ups +south
The ups projection is a special case polar aspect of the Stereographic
projection
designed to cover the regions where 
  84 N or 
  80 S. The internal
Stereographic
parameters are fixed at k0 = 0.994, 0 = 0, x0 = y0 = 2, 000, 000m, and

0 is either 90 N when +south is not specified or 90 S when +south is
specified.
Elliptical parameters must be used (either proj default or entered as
option). Also
see the Universal Transverse Mercator (utm) projection (p. 12).

So, I presumed that using the option -o"proj=ups" would suffice.

Could you clarify?

Thanks

Charlie

-----Original Message-----
From: owner-osrs-proj at remotesensing.org
[mailto:owner-osrs-proj at remotesensing.org] On Behalf Of Frank Warmerdam
Sent: Wednesday, January 07, 2004 3:29 PM
To: osrs-proj at remotesensing.org
Subject: [SPAM] - Re: [OSRS-PROJ] Error projecting Geographic to UPS -
Email found in subject

Charles D. Van Dusen wrote:
> Greetings
>  
> I am having a problem projecting a shapefile of canada from geographic

> to UPS:
>  
> 
> P:\Data\maproom.psu.edu>shpproj canada.shp projections\ups\canada.shp 
> -i=geographic -o"proj=ups"
>  
> 
> P:\Data\maproom.psu.edu>
>  
> The program appears to complete without error, but the resulting .prj 
> file has a single line of "proj=geographic" and the output shape file 
> is exactly the same as the input shape file.
>  
> So, in stepping though the debugger, the problem appears to be that 
> the SHPSetProjection call is returning 0 for the new_prj. Further, the

> call to pj_init in shpgeo.c is returning 0 as well.
>  
> My environ:
> Windows XP
> shapelib-1.2.10
> proj cvs as of December 2003

Charlie,

My understanding is that there are four UPS zones, and you aren't
indicating which to use.  I would gather that the pj_init() is therefore
failing because it doesn't have all the required arguments.

I haven't dug into the PROJ docs to find what the correct formulation is
for UPS, but I presume that is the issue.

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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