[GRASS-user] Orthorectification of Historic Aerial Photographs

[RAVI KUMAR]

Hi all,
1. Very old aerialphotographs for which you do not have supporting data like focal lengths etc, except a stereo pair of photos, how to convert them to digital ??
2. Can a normal (Hp)  A4 scanner work for this.
3. Any one on GRASS list tried it this way.

Ravi Kumar

Markus Neteler <neteler at osgeo.org> wrote: On Fri, Apr 11, 2008 at 5:09 AM, Shaun & Melissa Busler
 wrote:
> Markus,
>
> Thanks for the suggestion.  I will give those focal lengths a try.
>
> What do you mean by i.ortho.photo is robust and hope that it converges?

It won't explode :-) I mean that even if you are off from the true value it
may still get out a result.

Markus

PS: The algorithms is described in
     Elements of Photogrammetry, With Air Photo Interpretation and
Remote Sensing
     by Paul R. Wolf, 562 pages
     Publisher: McGraw Hill Text; 2nd edition (January 1983)

    (get that for cheap as second hand book. if interested..)
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