[Xastir] saving tigermaps server maps?

[Curt Mills, WE7U]

On Sat, 27 Sep 2003, Gerry Creager wrote:

> Someone correct me if I'm wrong, but I believe we're using 2 points to 
> register and not doing much beyond rubber-sheet stretching to rectify an 
> image over a vector dataset.

Correct.  We end up translating the two points provided out to
diagonal corners of the image and then we stretch/shrink/crop to fit
the screen and zoom level.


> In the normal GIS world, registration is done by an affine method, and 
> one wants a minimum of 3 points of control.  Similarly, rectification 
> usually requires 5-7 control points (with any more than 7 starting to 
> cause problems...).

Well, we're kind'a heading towards being more like GIS programs, but
we certainly don't have the knowledge/skillset in the current group
of developers in order to always do things the "right" way.  Just
using two points we can do some cool things, but we can't do rotation
or complex translations on the image.

Curt, WE7U.				archer at eskimo.com
http://www.eskimo.com/~archer
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