Hey Tim, great, the one thing I wonder here is if we should not have projection as a property of a geometry. It would make more sense to me that way than passing it as an argument to the getGeodesicXXX functions.
I think we had this discussion before but it was never concluded. http://www.mail-archive.com/dev@openlayers.org/msg02523.html Best regards, Bart Tim Schaub wrote: > Hey- > > A contributor (mwa at sourcepole.ch?) posted a patch for approximating > geodesic areas for polygons [1]. > > I have used this algorithm to give geometries a getGeodesicArea method. > In a similar way, I added a getGeodesicLength method using the > Vincenty algorithm already in Util. > > Combined, these give us handy methods for calculating metrics from our > geometries as if they were projected onto the earth's surface. Both of > these calculations require that a projection is provided > (Geographic/WGS84 is assumed if none is given). > > This functionality allows a "geodesic" property to be added to the > measure control. So, if your map projection is properly set, and if you > have provided the appropriate definition for that projection so a > transform to Geographic/WGS84 can be done, you can use the measure > control to do geodesic measures. > > All this is wrapped up in a new patch for ticket 1819 [2]. If anybody > cares to comment or test it out, that would be appreciated. > > Tim > > [1] http://trac.openlayers.org/attachment/ticket/1819/area_measurement.patch > > [2] http://trac.openlayers.org/ticket/1819 > > -- Bart van den Eijnden OSGIS, Open Source GIS [EMAIL PROTECTED] http://www.osgis.nl _______________________________________________ Dev mailing list Dev@openlayers.org http://openlayers.org/mailman/listinfo/dev
