[GRASS-ES] 2d to 3d

[vinod kumar]

Hi, I want to develop digital elevation model(DEM) from ortho image or
satellite image(spot) using Grass.

1)Can you tell me the process.
2)Is there any automatic method of extraction of DEM using grass?
3)if i want to apply an algorithm for image extraction of buildings then
what type of language should i use.
Thanks in advance
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