In response to David's post (which I didn't see until now), it's fairly
straightforward to back-transform a pixel into world coordinates. I've posted on
this in the past, email me offline and I'll send you more info about it.
Sanat, one thing I learned in the GIS classes years ago is that you must be very
careful to have all of your GIS data in the same projection/ellipsoid/units, or
they won't mix well. If your buildings are too large, then perhaps they were
modeled in feet and your Earth is modeled in meters, for example. If you don't
have any meta data for the models to tell your application what coordinate
system and units the model uses, there is no magic software trick to handle that
situation. So you have two solutions: Either manually put all your models (Earth
and buildings) into the same coordinate system and units, or manually ensure
that each model contains the necessary metadata so that your application can
transform them as needed into a common coordinate system and units.
-Paul
On 8/9/2011 10:24 AM, Sanat Talmaki wrote:
Hi David,
I guess I am replying to a rather old post, but I'll try my luck anyway:
Adding to your post on getting the size of the terrain, I had a similar
question in mind. For a given terrain model (built using osgeart/vpb etc), is
there a way to ensure that models loaded on the terrain conform to the scale of
the terrain. If I loaded a building model onto a terrain, unless I knows the
size of the terrain and the dimensions/scaling it is conforming to, my building
model may be unrealistically big/small not representing reality.
I was searching along these lines and came across your post and just wanted to
check if you had found any tool that helps you do this (getting terrain size)
Thanks
Sincerely,
Sanat
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=41951#41951
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-Paul Martz Skew Matrix Software
http://www.skew-matrix.com/
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