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
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