[mapserver-users] PHP MapScript pixel coordinates to map coordinates

[Morten Sickel]

Seems like noone have answered this yet...

In fact, it is as easy as using proportions. Mapservers mapextent is given in units of the actual projection of the maå. If you need to have the extent in another projection, the cornerpoints can be reprojected.

Morten

-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Shorthouse, David
Sent: Wednesday, January 20, 2010 4:57 AM
To: mapserver-users at lists.osgeo.org
Subject: [mapserver-users] PHP MapScript pixel coordinates to map coordinates

Folks,

This question has no doubt been asked many times, but for the life of me I cannot find a solution. Here's what I'm trying to do:

I have a jQuery-based front-end that uses the wonderful jcrop extension (http://deepliquid.com/content/Jcrop.html) that helps coordinate zoom. I'm hoping to use this same front-end to permit cropping of a resultant map image, which means I need to pass the four pixel corner coordinates, convert to map coordinates (projection may be variable), then set the extent such that the resultant map image will have the same dimensions as that described by the user on the front-end. So, how can I convert pixel coordinates to map coordinates?
Note that the map projection is not always DD so I cannot merely use proportions as I have seen in some solutions. Surely this is easier than I am making it out to be.

Thanks for any advice,

David Shorthouse
_______________________________________________
mapserver-users mailing list
mapserver-users at lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users