Hey, are you sure that your map actually uses the 'PLANETB' projection? Show a bit more code, especially which layers you add, or preferably point us to a fully configured example. Note that the base layer's projection - if specified - overrides the map projection.
Andreas. On Mon, Jul 8, 2013 at 2:51 PM, a.lu...@geolnet.net <a.lu...@geolnet.net>wrote: > Hello Folks, > > I already asked but got no reply, so I repost my question, sorry for > spamming you on that. > > > > > I intend to use OpenLayers for an educational project dealing with > planetary data. > I tried to get an accurate scale bar (i.e., ScaleLine object) from a > custom projection but it seems that ScaleLine does not understand > non-terrestrial sphere/ellipsoid. > > Here is what I have done: > > I first call proj4js: > <script src=" > http://svn.osgeo.org/metacrs/proj4js/trunk/lib/proj4js-compressed.js > "></script> > then OpenLayers > > and in a javascript sequence I do this: > > Proj4js.defs["PLANETB"] = "+proj=eqc +a=4500000 +b=4500000 +units=m > +no_defs"; > > function init(){ > > map = new OpenLayers.Map('map', { > controls: [ > new OpenLayers.Control.Navigation(), > new OpenLayers.Control.PanZoomBar(), > new OpenLayers.Control.ScaleLine({bottomOutUnits: > '',geodesic: true}), > new OpenLayers.Control.MousePosition(), > new OpenLayers.Control.Graticule() > ], > projection: new OpenLayers.Projection("PLANETB") > }); > > Unfortunately, when displaying the page, the scale bar is totally wrong. I > played with different values of "a" and "b", ScaleLine does NOT take into > account these values. The Proj4 syntax seems correct as it works smoothly > under QGIS for instance. For me, OpenLayers just does not understand > correctly proj4 projection. > > Any idea if OpenLayer can really understand proj4 syntax? and if not, how > can I contribute (i.e., where, which files?) in order to get this right? > > thank you for any feedback/ideas > > _______________________________________________ > Users mailing list > us...@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/openlayers-users > > -- Andreas Hocevar OpenGeo - http://opengeo.org/ Expert service straight from the developers.
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