[GRASS-user] rectifying digital images

[Maning Sambale]

Salamat!

Never expected such quick replies!

A few more details:
Camera:  Kodak Pro DCS 14N digital SLR camera 
using a 19-35mm Tamron zoom lens set at 19mm focal length, 13.5
megapixel resolution (4,500 x 3,000 pixels).

Images are in Kodak DCR format.  Converting to tif before export to
GRASS more than double the size.

I have the following parameters for each image:
FILENAME
IMAGE NUMBER
DATE
TIME
GPS STATUS
LATITUDE
LONGITUDE
ALTITUDE
ISO SPEED
APERTURE
SHUTTER	FOCAL LENGTH

> unless you use a brute force approach with
> the orthorectified Quickbird imagery, i.e. at least 100 control points
> per image and the strongest rubbersheeting method available.
I think I'd go this route as a last resort, I have approximately 800
images to rectify.


> > http://grass.gdf-hannover.de/wiki/Orthorectification_digital_camera
Thanks for this one

>>
http://ojs.info.gscc.osaka-cu.ac.jp/IJG/index.php/IJG/article/view/103/42

and this one!

We'll keep you posted as I do this.  

maning

On Sat, 2008-01-05 at 14:44 +0100, Vincent BAIN wrote:
> Merci !
> I'll try it soon...
> 
> 
> Le samedi 05 janvier 2008 à 14:21 +0100, Markus Neteler a écrit :
> > On Jan 5, 2008 1:56 PM, Vincent BAIN <bain at toraval.fr> wrote:
> > >
> > > Le samedi 05 janvier 2008 à 13:44 +0100, Markus Neteler a écrit :
> > >
> > > > On Jan 5, 2008 1:35 PM, Markus Metz <markus_metz at gmx.de> wrote:
> > > > ...
> > > > > Anyway, digital cameras are apparently not supported in i.ortho.photo.
> > > >
> > > > Why this? I did so, using a handheld digital camera:
> > > >
> > > >   M. Neteler, D. Grasso, I. Michelazzi, L. Miori, S. Merler, and
> > > >   C. Furlanello, 2005. An integrated toolbox for image registration, fusion
> > > >   and classification. International Journal of Geoinformatics. Special Issue
> > > >   on FOSS/GRASS 2004 & GIS-IDEAS 2004, 1(1), pp. 51-61, March 2005.
> > > >   PDF: http://ojs.info.gscc.osaka-cu.ac.jp/IJG/index.php/IJG/article/view/103/42
> > > >
> > > > > I heard of some tools that can add fiducial marks to digital photographs
> > > >
> > > > You can use the photo corners and calculate things yourself using
> > > > "jhead" or other tools.
> > >
> > > You mean pointing corners of the image as four fiducials, then assigning
> > > them the dimensions of the sensor, in a coordinate system centered on
> > > the estimated principal point ? If you do that with i.ortho.photo what
> > > value would you give to the focal length, the one provided by the exif ?
> > 
> > OK, I have added my draft recipe here:
> > http://grass.gdf-hannover.de/wiki/Orthorectification_digital_camera
> > 
> > Feel free to improve the page.
> > 
> > Markus
> > 
> 
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