Hi Martin
Thanks a lot. That image was georeferenced. So when i removed -xx and --yy as 
you told, I got the terrain. But my next question is my imagery file is only 
covering a small area and the elevation data is 3 arc sec srtm  hgt  file for 
1degx1deg . So I'm getting the terrain with imagery on some portion and the 
rest is white. How to limit the terrain so it covers only the area referenced 
in the image file. Also the quality of the texture is very poor compared to the 
original tiff file. Is it because of the image resolution is low?. 


Thank you!

Cheers,
Vijeesh

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