[GRASS-user] rectifying digital images

[Vincent BAIN]

If you follow Markus' how-to, you may be interested in technical info
concerning your camera :

Kodak DCS Pro SLR/n/c
imager size : 36.0mm x 24.0mm
pixel size : 7.9µm x 7.9µm

see this page for other cameras :
http://www.digitaldingus.com/reference/general/sensorsizes.php

Good luck !

Vincent




Le samedi 05 janvier 2008 à 23:25 +0800, Maning Sambale a écrit :
> 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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> > grass-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/grass-user
> 
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