Hi Yann, On Mon, May 8, 2017 at 10:12 PM, Yann <dr.yann.che...@gmail.com> wrote: > > Hi, > > Looking for some lore from i.ortho.photo days in GRASS 6 and before... > > Within i.image.2target, i.ortho.transform requires a REF_POINTS (image E, image N, photo X, photo Y) file as part of its RMS error computation, before using a CONTROL_POINTS (photo X, photo Y, photo Z, control X, control Y, control Z) file made by i.image.2target interactive GCP creation module. > > the i.photo.2image module, to my understanding is from (photo X, photo Y) to (image X, image Y), i.e. we keep in the non-map units, we only find the proper coordinates of the camera within the camera absolute dimensions (i.e. mm or other). So I do not believe it is related to generating a REF_POINTS file.
the i.photo.2image module does generate a REF_POINTS file. This is needed to translate from sensor (mm) to image (xy, pixels) and back. The sensor is e.g. the CCD in a DSLR, e.g. for Canon EOS-1Ds the sensor would be 35.8 mm × 23.8 mm. HTH, Markus M
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