[GRASS-dev] transform additional points from XY?

[Hamish]

Hamish wrote:
> If a georeferencing points file and target are set up it is
> possible to use g.transform to say how good the fit is.
> 
> I'd like to go one further: I'd like to pass g.transform a
> handful of x,y
> pixels from the the same neighborhood as the GCPs and get
> an approximate projected easting and northing back.
> 
> If possible at all, I guess we have to write something new
> for g.transform; any good ideas on how to do this?
> 
> It's a similar problem to the i.vpoints module which will
> back-project a
> vector map from the target location over what you are
> digitizing without knowing the source projection terms by name.


I would settle for knowing how to get the module output the transform
matrix used, so I could do the calculation by hand.


thanks,
Hamish