Re: [osg-users] geographical coordination conversion
Hi, Shayne. Thanks for your reply. What i want to do is converting Lon/Lat coordinate with WGS84 coordinate system to X/Y coordinate with Mercator coordate system. How can I program in OSG？ Thank you! Cheers, tianyun -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=53862#53862 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] geographical coordination conversion
The code snippet you provided maps from a geodetic coordinate system to a geocentric ECEF cartesian coordinate system so that the point (lat,lon,0) maps to the cartesian point (o,p,q) which lies on the surface of the ellipsoid. This probably isn't what you're looking for since it sounds like you've built your database to cater to a cylindrical map projection. Also in the method convertLatLongHeightToXYZ(), height is given in meters, not degrees... Shayne -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=53860#53860 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] geographical coordination conversion
Hi, I use osgdem to create an IVE model with mercator projection and can load the model in my OSG program. I want to realize such funciton: (1) input the WGS84 coordinate (lon, lat) of target point (2) calculate the elevation (z) of the point from the terrain file (3) draw a graphic object at the point (lon, lat, z) The problem is how to convert the WGS84 coordinate of inputted point to mercator projection which is used in my OSG program. I have used the folllowing method: osg::ref_ptr csn=new osg::CoordinateSystemNode; csn->setEllipsoidModel(new osg::EllipsoidModel); csn->addChild(terrain);//"terrain" is IVE model with mercator projection double o,p,q; csn->getEllipsoidModel()->convertLatLongHeightToXYZ(osg::DegreesToRadians(80.0),osg::DegreesToRadians(115.0),osg::DegreesToRadians(0.0),o,p,q); The convert value (o,p,q) is not correct. How can I realize the function? Thank you! Cheers, tianyun___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
