[GRASS-dev] New georectifying module in TclTk

[Michael Barton]

I will admit from the beginning that since I don't really know C, I may well
be missing something. But I think this calls some transformations in
i.rectify somehow. As I understand it (also in the i.points and i.rectify
docs), you first need to rectify the points using one of the rectification
transformations. Then you can go ahead with the compute_transformation()
procedure.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton



> From: Glynn Clements <glynn at gclements.plus.com>
> Date: Tue, 6 Jun 2006 02:17:29 +0100
> To: Michael Barton <michael.barton at asu.edu>
> Cc: GRASS developers list <grass-dev at grass.itc.it>, Helena Mitasova
> <hmitaso at unity.ncsu.edu>
> Subject: Re: [GRASS-dev] New georectifying module in TclTk
> 
> 
> Michael Barton wrote:
> 
>> Anyone who is familiar with how i.rectify works, I need to ask for help on
>> RMS error calculation. Somehow, I need to actually rectify the GCP's so I
>> will get meainingful RMS error results. I can't find where to do this in the
>> C code (semi-incomprehensible to me).
> 
> AFAICT, the relevant function is compute_transformation() in
> imagery/i.points/analyze.c.
> 
> -- 
> Glynn Clements <glynn at gclements.plus.com>