[mapserver-users] projecting in degrees

[Fawcett, David (MPCA)]

My understanding of spatial reference systems(SRS) is that the units of the utilized by the SRS are inherently part of the definition.  When data is projected to a particular SRS, the units are set by that SRS.

It sounds like you are looking for some sort of cylindrical based  SRS

Maybe Miller Cylindrical (except units are in meters)? http://www.colorado.edu/geography/gcraft/notes/mapproj/gif/millerc.gif  http://spatialreference.org/ref/esri/54003/

Maybe straight unprojected lat long?  http://www.colorado.edu/geography/gcraft/notes/mapproj/gif/unproj.gif

You can possibly handle the conversion of extents on the client side.

Your annotations could be handled in 'degrees' by defining input projections for your layers and an output projection for your map.  Your annotation layer could be in geographic coords and the annotation points would be projected by MapServer.

David.



From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Josh Jordan
Sent: Friday, August 20, 2010 7:20 PM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] projecting in degrees

I have shapefiles that are stored in degrees and they are displayed in degrees if there are no projections in the mapfile.  When displayed like this, they look like UTM world projection.  However, I need to display it in old style mercator where greenland is really big.  I can get mapserver to project as mercator, but it always converts to meters.  I would like to project my shapefiles in degrees.  Is this possible?  I need to because I handle extents and annotation points in degrees.

Thanks.


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