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Mia Nelson

Draping an orthophoto over a DTM - is it possible?

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Probably not simply: it would mean a Texture Bed which I've not had much luck with, but if you use the Drape Surface command to make a NURBS surface of the DTM it should be a fairly "straightforward" exercise to map the photo as a Renderworks Texture.

It will be distorted, of course, because the photo is flat and the terrain is not, but maybe OK.

N.

Edited by propstuff

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Is is possible to drape a photo over a DTM? Even free Google Earth can do this - I gotta believe I can do it too, right?

Maybe, maybe not. Can the free Google Earth give you exact 3D-coordinates of every pixel? I gotta belive it can...

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I want to use my own orthophoto and contours, which are a lot better than Google Earth's...

So, I need to first make a NURBS of the DTM that's the same size as the orthophoto, and then make a texture out of the ortho?

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So, I need to first make a NURBS of the DTM

Yes. that's fairly simple with Drape Surface

that's the same size as the orthophoto,

No, it will be the size of the DTM

and then make a texture out of the ortho?

Yes, then you map the texture size to the Surface.

N.

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No, is that what I need to learn, texture mapping? I see it in the manual, but so far I haven't had to do it. If I know that it will work, I will invest the time and try to figure it out. Thanks for the tips!

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Mia,

It is a workaround. One should be able to bring in a GeoTIFF and just tell it to become the surface of the DTM. This is, AFAK, not the case.

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