Custom Projection

[Frank Warmerdam]

Abe Gillespie wrote:
> Hello all,
> 
> Forgive my ignorance on the subject - is there a way to define a
> custom projection such that it simply applies a rotation to the map?
> For instance, instead of the map being oriented with the top as north,
> I need to orient it in a "you are here" fashion.  I want to put the
> entrance of a building at due south.
> 
> First, in general, can this even be done?  What I mean to say is are
> projections even used in this fashion?  Second, if it can be done, how
> does one go about defining a custom projection?  Can you fire up
> ArcGIS and use the GUI?  Are there command line tools?

Abe,

I'd advise against trying to accomplish this using projections, but if
you look in the RFC list on the mapserver website you should find one
that addresses rotated maps that you may find helpful.

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    | President OSGeo, http://osgeo.org