[Xastir] FIltering FOR NWS Watchbox Polygons

[Gerry Creager]

Do I need to take my product for watches and warnings and create yet 
another WMS layer?  Oh, yeah: I do have that.

http://mesonet.tamu.edu/cgi-bin/pan?SERVICE=WMS&VERSION=1.1.1&REQUEST=getcapabilities 
is the getCapabilities document.  Formation of the call would be similar 
to the WMS call for radar.  Curt, shouldn't the same code support both?

Also, if you ask nicely this WMS will give you both radar and the 
watches/warnings.

FOR the record, warnings now are county-based rather than the old, 
familiar parallelograms.  Warnings for Thunderstorm, Tornado, Flash 
Flood, and Special Marine are polygon-based (or Storm-based).

gerry

Eric Germann wrote:
> Colleagues,
> 
> I spent some time last night beating my head on the wall trying to figure
> out why NWS Watch/Warning polygons weren't coming up when I zoomed way out
> to watch the storms a couple of states away.
> 
> So I brought up their polygons via SHP files and couldn't see them.  Of
> course, without a dbfawk file, they're black, so on my black background,
> they were missing.  Problem solved there.
> 
> But I still couldn't figure out why the "normal" watch warning polygons
> weren't coming up.  Today they're up since we're getting hammered again in
> West Central Ohio.
> 
> Then it dawned on me.  They're coming via APRS-IS feeds and I have a 320km
> radius filter set.
> 
> What I want to accomplish is to have nationwide watch warnings without
> polling NWS every couple of minutes.  Seems like the way to do it is to
> create another link to my internal APRS server (which is linked to
> APRS-IS, so I don't have a bunch of clients polling the core) with a
> filter set to only catch the polygon announcements.  Only issue is, I
> don't what the packets look like or how to build that filter.  I'd like to
> keep the 320 km limit for stations which is a pretty good field of view on
> a 22" monitor.
> 
> Any ideas, thoughts?  Or would the better approach be to just use the NWS
> files for farther out and write up the dbfawk files (not an issue to do
> that).  As an academic exercise, the multiline polygons would be
> interesting over APRS and filtering them.
> 
> 73 de N1ICS
> Eric
> 
> 
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-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
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