[GRASS-user] Orthorectification of Historic Aerial Photographs

[Vincent Bain]

May it be a stupid suggestion, but did you try to contact anyone at the
USGS ? perhaps they maintain data from these old times... (here in
France IGN is always helpful, and can provide answers to such historical
requests)

Vincent.

Le jeudi 10 avril 2008 à 18:33 +0200, Markus Neteler a écrit :
> On Thu, Apr 10, 2008 at 5:29 PM, Shaun & Melissa Busler
> <buslers at gmail.com> wrote:
> > Unfortunately, the focal length of the camera is not on the photo border.
> > The photo must be too old.  Do you have any recommendations on what focal
> > length I should try?  It was taken in 1939 for the USDA Agricultural
> > Adjustment Administration.
> 
> You could try 150mm or 305mm. In fact, i.ortho.photo is quite robust,
> just try and hope that it converges.
> 
> (and/or: Maybe someone on the PROJ4 list knows.)
> 
> Markus
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