Hi,
Original coordinate of tif file is the longitude and latitude coordinates,Use
gdalwarp converts to merctor projection: gdalwarp -t_srs “+proj=merc
+datum=WGS84” 0-40.tif merctor.tif, merctor.tif, Then use osgdem to make
merctor. tif generate planar model: osgdem --cs “+proj=merc +datum=WGS84” –xx
10 –yy 10 –v 0.5 –l 3 –o merctor.ive
And then load the merctor.ive in osg appalication,and use osgpick to pick up
the model as following:
osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
osg::ref_ptr<osg::Group>group=new osg::Group;
osg::ref_ptr<osg::Node> node= osgDB::readNodeFile("merctor.ive");
osg::ref_ptr<osg::CoordinateSystemNode> csn=new osg::CoordinateSystemNode;
csn->setEllipsoidModel(new osg::EllipsoidModel);
csn->addChild(node);
csn->setFormat("PROJ4");
csn->setCoordinateSystem("+proj=merc +datum=WGS84");
osg::ref_ptr<osgText::Text> updatetext = new osgText::Text();
CreateHUD *hudText= new CreateHUD();
csn->addChild(hudText->createHUD(updatetext.get()));
viewer->setSceneData(csn);
viewer->addEventHandler(new osgViewer::WindowSizeHandler);
viewer->addEventHandler(new osgViewer::StatsHandler);
viewer->addEventHandler(new CPickHandler(updatetext.get()));
//pick as follows:
if (viewer->computeIntersections(x,y,intersections))
{
osg::ref_ptr<osg::CoordinateSystemNode>
csn=dynamic_cast<osg::CoordinateSystemNode*>(viewer->getSceneData()->asGroup());
osg::EllipsoidModel* em=csn->getEllipsoidModel();
for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
intersections.begin();hitr != intersections.end();++hitr)
{
os<<"Mouse in World X:"<<
hitr->getWorldIntersectPoint().x()<<"Y: "<<
hitr->getWorldIntersectPoint().y()<<"Z: "<<
hitr->getWorldIntersectPoint().z()<<std::endl ;
double x,y,z;
// Can also use EllipsoidModel obtain latitude and longitude coordinates to
plane model?
em->convertXYZToLatLongHeight(hitr->getWorldIntersectPoint().x(),hitr->getWorldIntersectPoint().y(),hitr->getWorldIntersectPoint().z(),y,x,z);
os<<osg::RadiansToDegrees(x)<<" "<<osg::RadiansToDegrees(y)<<"
"<<z<<std::endl;
// The following can I get real projection coordinates as in the model tif?
osg::Vec3 mercVec=csn->computeLocalUpVector(hitr->getWorldIntersectPoint());
os<<mercVec.x()<<mercVec.y()<<mercVec.z()<<std::endl;
}
}
Is the Coordinatorsystem ,setform, setcoordiantorsystem correct above the code,
with EillpsoidModel can obtain the actual latitude and longitude? If can not
how to obtain real coordinates of a model as tif describe?
Thank you!
Cheers,
SongMeng[/url]
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=53478#53478
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