>I have an airphoto image and a trail map image, and wish to overlay
>them so the trails show appropriately on the airphoto.  Have set up
>layer for each, and have to move, rotate, scale, the trail image
>hoping to line things up.  It requires multiple tweaking (each
>affecting another), and the result is not very satisfactory.  Is there
>a better way?  Ideally pick similar locations on each layer image (say
>road intersections or geographic feature) and the program will scale,
>rotate, etc the layer as appropriate to get them aligned ?

There are Gimp plugins that will align two layers but only between two points.

There is a plugin here: 
http://sourceforge.net/projects/gimp-tools/files/scripts/  ofn-layer-aligner
about 30 down the list ofn-

In the very-much simplified example:  A four point path A-B-C-D defining the
start and finish of intended and actual, scales and rotates to suit. Very much
depends on the images, different  map projection and camera angle and it might
be easier to draw in by hand.

A non-gimp solution might be Hugin which has a stack alignment option. Not easy
to use and I have not had much success unless the images are very similar.

* https://www.gimpusers.com/system/attachments/1163/original/route01.jpg
* https://www.gimpusers.com/system/attachments/1164/original/route02.jpg

rich404 (via www.gimpusers.com/forums)
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