[Xastir-Dev] Making geo maps fit the world.
Gerry Creager
gerry.creager at tamu.edu
Mon Sep 29 08:53:20 EDT 2003
Couple of thoughts.
1. Looks like the projection is probably Lambert Conformal Conic with a
central meridian of -98.5 or so. We don't do well with reprojection at
this point (bring on GDAL!) so that's gonna be a bit of a problem.
2. The refresh interval on this forecast is probably more like hours,
than 10 minutes. You can conserve some bandwidth by geting it every
hour or 2... Radar refreshes at a 6 minute rate.
Reprojection is a problem for you here. Until we either take full
advantage of proj4 or migrate, we won't be able to account for all the
strange and wonderful ways people have developed for drawing curved
shapes on flat paper or monitors.
And on that note, I've been slamming my head against proj4 in mapserver,
and decided that while I may know something about reprojection, it's
certainly NOT in the context of THAT code.
73, gerry
Jerry Chamberlin wrote:
> I have:
>
> #IWIN NOAA COMPOSITE
> URL http://iwin.nws.noaa.gov/iwin/images/92f.gif
> # X Y Long Lat
> TIEPOINT 0 0 -129.00000 53.00000
> TIEPOINT 1023 767 -67.00000 20.00000
> IMAGESIZE 1024 768
> REFRESH 600
> TRANSPARENT #ffff
>
> Been playing to make fit.
> How does one adjust for the curve of the eath.
> Is there a tag or formula ?
> THe weather alerts show up nice on top this NOAA Composite.
>
> The Net Lab year 2000 and beyond Internet Education is Science
> http://www.netlab.org
> WA0JRJ - Jerry
> used to be ICQ 6408731
> used to be AIM PappyJerry
>
> _______________________________________________
> Xastir-dev mailing list
> Xastir-dev at xastir.org
> https://krypton.hscs.virginia.edu/mailman/listinfo/xastir-dev
More information about the Xastir-dev
mailing list