DEM from IKONOS 0.8m Resolution Stereo Satellite Imagery

[Hascen]

Can anybody help me on creating DEM from IKONOS 0.8m Resolution Stereo Satellite Imagery as i want to explore this field?

[hariasa]

Sure.

1: Make sure you have several ground control points (5 per image, distributed around the picture, ought to do it although if you have very hilly terrain then you should use more...) with XY (use an ortho image) and Z (use an existing DEM) (alternatively you can go out in the field and measure it yourself) where the ground control points are on ground level (i.e. a road intersection, not a building).

2: Use LPS in ERDAS to load the stereo imagery in and then ground reference away.

3: Automatically generate tiepoints and check up on RMSE values (that they are not too high, otherwise you will have verify that the ground control points are on the correct location)

4: After this, you can generate a DSM and adjust it with the eATA or aATA software to filter, adjust and view the points in ERDAS. These points can then be exported to a contour, TIN or Raster.

Good luck!