[Proj] Arbitrary translation and custom projection

Yves Moisan yves.moisan at boreal-is.com
Thu Aug 28 09:18:56 EDT 2008

Hi All,

In PostGIS, we have points in a local system that we have made an affine
transformation for to get them in EPSG 900913.  We followed instructions
at http://casoilresource.lawr.ucdavis.edu/drupal/node/433 so we
collected a bunch of GCP's, ran a regression and applied the resulting
coefficients to transform our local coordinate points to 900913 using

I guess we could alternatively determine a custom projection string and
use transform.  I would like to know about pointers to tutorials as to
how to do that.


Yves Moisan

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