[GRASS-user] Orthorectification of tilted digital camera images

[Florian Mueller]

Dear Stefan,

Can you provide some example photos in a Dropbox (e.g.) folder?

Best regards,
Florian


On Sat, Aug 15, 2015 at 7:53 PM, Markus Neteler <neteler at osgeo.org> wrote:

> On Tue, Aug 11, 2015 at 11:37 PM, Blumentrath, Stefan
> <Stefan.Blumentrath at nina.no> wrote:
> > Dear all,
> >
> > Although there is a lot of relevant information regarding the
> > orthorectification of tilted digital camera images in GRASS GIS online
> > (here:
> ...
> > Does up-slope direction of the photo or sky in the photo conflict with
> the
> > orthorectification algorithm?
>
> I have no idea... in general the algorithm is very robust but was
> really written for aerial photos.
>
> >
> > When it comes to the GCPs I am in principle quite confident that they are
> > placed OK. Or do you think that GCPs measured by a hand held GPS are too
> > imprecise?
>
> They should be fine.
>
> > However, depending on initial camera settings RMS something like 268,
> which
> > indicates that something is wrong here. If I do not use i.photo.init, the
> > image is placed much better (RMS around 10-20), but still pretty poor…
>
> About 10 years have passed that I tried the last time, memory is fading...
>
> Did you figure it out?
>
> ...
> > Btw: Some of the submodules of i.ortho.photo are not linked to the /bin
> > folder in GRASS 6.4.5svn, so I have to start them like this:
> > /usr/local/grass-6.4.5svn/etc/i.photo.init
>
> To my knowledge they are intentionally hidden in order to be run from
> the i.ortho.photo main menu (in GRASS GIS 6).
>
> Markus
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