On Dec 7, 11:27 am, kfj <[email protected]> wrote:
> Thanks for sharing. I had a look at your data. One thing straight
> away: you have Z-values. You don't want them, since the scale of all
> the images is the same, and Z values refer to the distance from the
> mosaic plane. Just set Z to zero.

Actually the scale strongly varies among the 24 pieces (maybe not in
the sample I provided though), so I have Z factors. One of my problems
is to convert this Z factor into a scaling factor (see the message
about the transX/Y/Z parameters).

> Stitching this, with the input images' projection and the panorama
> projection set to rectilinear, should give you a result where the
> input images aren't distorted at all, just nudged into place.

Yes, it works, but the process doesn't scale (because of the memory
and the required manual steps).

> Finally, I'd like to ask you how sure you are that the errors of
> 'several metres' you've observed after georeferncing the data with
> JOSM might not be in the source material?

The cadastre is reference for the property limits, so it's very
accurate. I could verify that myself by stitching myself a few
samples. They fit very well.

> To use the data as source for OSM, I think you'd be
> well advised not to stitch the maps with hugin, but to georeference
> the individual sheets as best as you can, be it in JOSM or QGIS.

That was actually my first approach, but since I don't have precise
sources for the georefencing, it's not accurate enough. That's the
reason why I am trying to use the internal consistency of the pieces
between each other.

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