[postgis-users] use of the affine() function

[Dylan Beaudette]

On Tuesday 29 May 2007 12:41, Dylan Beaudette wrote:
> > In order to turn a set of [src, dest] coordinate pairs into an affine
> > transformation, you have to solve a system of linear equations.  The
> > solution is the entries in the require affine transformation matrix.  In
> > order to fully determine an affine transformation you need 3 control
> > points and their images under the transformation.

Ok, here is a quick how-to:

http://casoilresource.lawr.ucdavis.edu/drupal/node/433

cheers,

-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341