[GRASS-user] Orthorectification of Historic Aerial Photographs

[Shaun & Melissa Busler]

Jamie,

I am not familiar with panotools.  I am willing to give it a try though!

Shaun

On Thu, Apr 10, 2008 at 1:16 PM, Jamie Adams <dickeya at gmail.com> wrote:

> Would it be possible to calculate these parameters with a panoramic
> creation package like panotools?
>
> http://wiki.panotools.org/Lens_correction_model
>
> It calculates a value for field of view, but I didn't notice an actual
> focal length parameter.  Maybe this is easy to associate?
>
> One benefit is that you are calculating using image overlap, which may be
> easier than trying to reference to a recent photo.
>
> -Jamie
>
>
> On Thu, Apr 10, 2008 at 9:53 AM, Vincent Bain <bain at toraval.fr> wrote:
>
> > 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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> > >
> >
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>
>
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