On Jan 5, 2008 1:56 PM, Vincent BAIN <[EMAIL PROTECTED]> wrote: > > Le samedi 05 janvier 2008 à 13:44 +0100, Markus Neteler a écrit : > > > On Jan 5, 2008 1:35 PM, Markus Metz <[EMAIL PROTECTED]> 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 _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user