Advice wanted: rectifying of aerial photographs

[Angus Carr]

Given your difficulties with the likely innaccuracy of your maps, have 
you thought of ignoring the paper maps, getting a good GPS unit and 
rectifying using those points? You could work with that.
The accuracy is better than your hand-drawn maps, although it is not 
perfect. It is likely the best you can do, if you use differential 
correction, you should get acceptable accuracy for 1:20,000 mapping.

Good Luck, anyway. I have been doing this recently, so if you have any 
questions, I will be happy to help. The imagery tutorial at Moon is quite 
good too. It takes you through the steps. 

By the way, if the groound isn't flat, then you likely want i.rectify2.

Angus Carr.

On Tue, 9 Apr 1996, Philip Verhagen wrote:
> I need some expert advice on the (im)possibilities of rectifying
> aerial photographs with GRASS or other software. The problem: I
> ...
> 
> Is there any chance of doing this with a reasonable accuracy (e.g.
> with i.rectify), and if so, what are the conditions that should be 
> met? Any advice will be greatly appreciated!