Yes, I'm aware of the shapefiles for defining the geographical areas for
NWS offices, but thanks for the reference.
However, I'm trying to build an APRS client "for the masses" where a
single download, a single configuration, and they're up and running. No
other files to go fetch and/or keep updated against change. I'm
striving for use of APRS-sourced data for the most part (Ok, I've
deviated by fetching the EchoLink node status just before AVRS came
online and I do support displaying geocaches from GPX files).
The multi-line ovject format is much better, IMHO, than an external
shapefile because the lat/lon data from the NWS's specific alert is
encoded into APRS-speak and displayable from the single object
transmission. Nice, precise, and not subject to a potentially obsolete
set of shapefiles causing the alert area to be the wrong shape.
Eventually, I might change my mind on this, but until I exhaust most of
the APRS-sourced data, I'm trying not to branch out into other,
especially non-ham, data sources.
<joking> Besides, I have to leave some reason(s) for the existence of
other APRS client software, don't I? </joking>
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
Brian Webster wrote:
Lynn,
There are predefined codes that correspond to shape files which can
be downloaded. Sometimes the codes match up with county names and sometimes
a NWS office has defined a more logical zone based on weather patterns for
that area. Not sure if you have a GIS or mapping background but shape files
are a semi standard map file format that have geometry information coded in
to a database record. If an APRS program is able to work with shape files
there is a way to create geographic information through a relational
database table.
I am probably not explain it all that well as I work with mapping files all
the time and it makes sense to me :-)
Maybe this does a better job http://en.wikipedia.org/wiki/Shape_files
Brian N2KGC
-----Original Message-----
From: xastir-boun...@lists.xastir.org
[mailto:xastir-boun...@lists.xastir.org] On Behalf Of Lynn W. Deffenbaugh
(Mr)
Sent: Monday, January 17, 2011 5:02 PM
To: Xastir - APRS client software discussion
Subject: Re: [Xastir] Wx Alerts
Just for my complete understanding, what is CW8048? I though the NWS
office codes were 3 characters and that a b/XXX* filter would pick up
what I need (for instance b/MLB* for my local (Melbourne, FL) weather
service office?
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
PS. Realizing that we're getting pretty deep into an off-xastir-topic
discussion and begging the indulgence of the list.
Guy Story KC5GOI wrote:
I am still using aprsD on my igate and am able to specify specific alerts
for my CWA from the feed to go out RF. For example CW8048. I only send
out
the ones for my county, not adjacent ones. The DFW area frequency is too
busy as it is.
I have stuck with aprsD for various reasons. It is not a knock at Pete
who
is a county away and a friend of mine.
On Mon, Jan 17, 2011 at 3:31 PM, Tom Russo <ru...@bogodyn.org> wrote:
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