For the sake of OpenLayers users who follow this route, I'd like to point out that the reason that the OpenLayers Graticule Example <http://dev.openlayers.org/releases/OpenLayers-2.13.1/examples/graticule.html> is able to show a polar projection with radial graticule lines is due to the following three lines, at the top of the example's HTML page:
/[script src="http://svn.osgeo.org/metacrs/proj4js/trunk/lib/proj4js-compressed.js"][/script] [script type="text/javascript"] Proj4js.defs["EPSG:42304"]="+title=Atlas of Canada, LCC +proj=lcc +lat_1=49 +lat_2=77 +lat_0=49 +lon_0=-95 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs";/ *Note:* I changed the angle brackets to square brackets, I did not want to inadvertently embed a script in my message. I changed the last line above to use the EPSG:3995 projection information, since that is the projection we are using. This finally allowed the OpenLayers graticule to show radial lines. Up to that point, they were always forming a rectangular grid. /However/, just as Arnd Wippermann said, the graticule works very poorly in this mode. Scaling and panning causes the graticule lines to do crazy things. I just wanted to find out why it worked differently in this example. It does not nearly work well enough for our software project to be practical. One thing is very strange about having add this projection information for Proj.4. We have Proj.4 installed on our server. It installs a library file called */usr/share/proj/epsg*, which contains the same definition for EPSG:3995 that I added to the Proj4js.defs. So why does Proj.4 need to be explicitly given the projection information that OpenLayers already has, in order for the Graticule to work? This seems unnecessary and redundant. Thanks again to Arnd for your generous help! Scott C. -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Problem-Setting-maxExtent-for-Polar-Projection-EPSG-3995-tp5089954p5091308.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list us...@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/openlayers-users
