Dyan Catamaran wrote:
> I would like to register several (200) images on a base map. The base map
> can be one map or two hundred maps. There are three GPS control points
> per image. The manual process seems to be lengthy and costly. I wonder
> if you know any automatic process to register images. I foresee a kind of
> application where the image and base map filenames can associated by a
> common link and a routine / batch would be able to do the job. Any ideas?
Hi Dyan!
Assuming that you have all image file names and their corresponding
control points (pixel values/coordinates) in a computer readable list,
you can do like this:
1 Register one image manually
2 Check the syntas in the resulting TAB file
3 Write a program that writes such TAB files for all of the images,
reading data from the list
Another thing is the highly questionable value of a georeference with
only 3 points.
You must realize that three points is the absolute minimum for
georeferencing, and that you will always get a 0 pixel error, no matter
what errors may exist in the control points.
I would say that 4 points is the minimum number of control points.
(Unless we are talking about ortho photos in which case the provider
ought to have provided the necessary TAB files in the first place.)
Regards, Mats.E
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