[Xastir] georeferencing maps on osx?

[Tom Russo]

On Tue, Dec 28, 2004 at 09:06:32PM -0500, we recorded a bogon-computron collision of the <shadow at dementia.org> flavor, containing:
> Actually, I'm looking for pointers to elsewhere I might ask this question.
> 
> I have scanned USGS quads I want to georeference myself, for use with 
> xastir. I'm not even sure what I'm in for, I assume selecting 4 points by 
> mouse, keying in coordinates, and possibly rotating, resizing or 
> resampling to get something sane. Am I screwed short of spending big money 
> on an expensive package to do it?

You need at least 5 points to do it right, more for better accuracy.

I recommend GRASS, a free GIS package that you can even download in binary
form for your OS X machine.  http://grass.itc.it/

If you choose to go this route I can send you some pointers for what modules
in grass you need to run to get the job done.  It's kinda labor intensive, but
it gives you properly georeferenced rasters.

-- 
Tom Russo    KM5VY     SAR502  DM64ux         http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236 AHTB#1 http://www.qsl.net/~km5vy/
 "When life gives you lemons, find someone with a paper cut."