[mapserver-users] projecting in degrees

[Josh Jordan]

Thanks for the suggestions.  I am able to reproject my maps with mapserver.  I found out what projection my maps started in by reprojecting in QGIS, it filled in the starting projection.  Either it calculated what that projection was, or it was the default.  Then, wherever my site modified coordinates in the mapfile, I used cs2cs to convert meters to degrees first.  Alaska wraps so I had to change starting longitude to -40.  All works good now! 

--- On Tue, 8/24/10, Fawcett, David (MPCA) <David.Fawcett at state.mn.us> wrote:

From: Fawcett, David (MPCA) <David.Fawcett at state.mn.us>
Subject: RE: [mapserver-users] projecting in degrees
To: "Josh Jordan" <outerspaceman81 at yahoo.com>, "mapserver-users at lists.osgeo.org" <mapserver-users at lists.osgeo.org>
Date: Tuesday, August 24, 2010, 12:10 PM




 
 






 



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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