[Xastir-Dev] I'm adding support for maps.aprsworld.net

[Gerry Creager]

Given a choice, I'd prefer Lat/Lon UNPROJECTED:  A flat, square map. 
Distortion as you go n/s of the equator farther, but for most apps, 
especially for SAR apps, which tend to be more local in scope, it will 
work fine.  Barring that, we can talk about the other possibilities, but 
it'd be a lecture series.  Which I've been known to launch into.

Gerry

James Jefferson wrote:
> List- I'm adding support to Xastir for using maps.aprsworld.net. The web 
> interface is a lot like the Tiger map server, so it isn't too difficult. The 
> result will be a relatively faster internet map server that will provide the 
> functionallity of having local shapefiles without needing gigabytes of them.
> 
> The difficulty I'm having is with the projections. It appears that Xastir is 
> expecting a project map. But to what projection? I'm getting icons that are 
> showing up wrong by a block or two. I'm drawing the map based on the left, 
> right, top, and bottom variables (latitude and longitude bounding box) in the 
> draw_tiger_map() function.
> 
> maps.aprsworld.net should be similar to mapblast. It is presenting an 
> unprojected image. When I overlay the local shapefiles of the same data on 
> top of the maps.aprsworld.net maps it looks like left to right is on the 
> right scale, but up and down are totally wrong.
> 
> Thoughts?
> 
> -Jim
> 
> PS - I have a few preliminary screen shots at:
> 
> http://aprsworld.net/tmp/
> _______________________________________________
> Xastir-dev mailing list
> Xastir-dev at xastir.org
> http://krypton.hscs.virginia.edu/mailman/listinfo/xastir-dev


-- 
Gerry Creager -- gerry.creager at tamu.edu
Network Engineering -- AATLT, Texas A&M University
Office: 979.458.4020  FAX: 979.847.8578
Cell: 979.229.5301    Pager: 979.228.0173