Hi Rahul, VPB generally works in meters, but in the case of data output geographic coords (i.e. lats and longs), the units will be converted into a proportional height to keep the visualization appropriate - if one doesn't do this then you end with with colossal spikes in the data. If you use --geocentric then the data will be in meters.
Robert. On Wed, Mar 12, 2008 at 11:14 AM, Rahul Jain <[EMAIL PROTECTED]> wrote: > Hi All, > I am not able to understand the "unit" of the height (z value of the > point) of the data generated by VPB. > For example I have "DEM" data which is in lat/long and i have generated > the height-field, each point > in the height-field has some finite value. What does this value > represents ? height in which unit (m , km ). > > In the case of DEM data being in UTM coordinates I think the z value is > in "meters", but in case of lat/long > I am not able to understand the dimension. I tried converting > lat/long/height value to UTM using gdal. I am > able to convert lat/long to corresponding UTM x/y value but the height > value comes out to be same after > conversion. > > Can anyone tell me how to do the conversion using gdal or with out gdal > to interpret the height data while > generating the height-field from DEM data in WGS84 lat/long. > > Any help will be deeply appreciated. > best regards > Rahulj > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
