[aprssig] Link for "Polygon and Line OBJECTS" spec
Tom Russo
russo at bogodyn.org
Tue Nov 1 16:34:47 EDT 2016
On Tue, Nov 01, 2016 at 02:20:58PM -0400, we recorded a bogon-computron collision of the <spam8mybrain at yahoo.com> flavor, containing:
> I agree with Lynn. I also used his specified master document copy from aprs-is.net in defining the queryable Aloha circles in YAAC. To clarify, you can ask a YAAC instance, through the standard APRS text message mechanism, to report its current Aloha circle, and it will send it as a NWS multiline. The directed query command is
> ?ALOHA
> Not sure how useful this is, but it is available.
I, too, use the multiline protocol in a little ELT DFing data reduction program,
to produce error ellipses that are transmitted over APRS to be displayed
around computed fix locations. It works very well.
I've got a Qt C++ and a straight C implementation, both GPL'd and available
to anyone who would like to copy it. The C implementation is buried, unused,
inside Xastir's "util.c" file (https://github.com/Xastir/Xastir/blob/master/src/util.c),
and the C++ variant can be found in APRS.cpp of qDF
(https://github.com/tvrusso/qDF/blob/master/APRS.cpp).
I put it into Xastir thinking we'd eventually get Xastir to transmit its
"CAD objects" using this technique, but that never got implemented.
> -------- Original message --------
> From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb at homeside.to>
> Date: 10/31/16 8:19 PM (GMT-05:00)
> To: aprssig at tapr.org
> Subject: Re: [aprssig] Link for "Polygon and Line OBJECTS" spec
>
>
> I go to the original source of the
> specification:
>
>
>
> http://www.aprs-is.net/wx/multilineprotocol.aspx
>
>
>
> I use this specification for my satellite object footprints as the
> new lightning StrikeZone outlines.?? In my case, I put a !DAO!
> (typically !W00! which adds no particular precision) after the
> closing { bracket to avoid being mistaken for a WXSRV packet which
> uses those 5 characters for the sequence number.
>
>
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and
> Win32
>
>
>
> On 10/31/2016 2:48 PM, Weston Bustraan wrote:
>
>
>
> Hello,
>
>
>
> It seems that the link labeled "Polygon and Line OBJECTS
> (new for page 31)" on??http://www.aprs.org/aprs11.html
> now points to a page that is missing.
>
>
>
> Does anyone have a link where I could find information on
> how to implement the new spec?
>
>
>
> Wes Bustraan, W8WJB
>
>
>
>
>
>
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--
Tom Russo KM5VY SAR502 DM64ux http://www.swcp.com/~russo/
Tijeras, NM QRPL#1592 K2#398 SOC#236 http://kevan.org/brain.cgi?DDTNM
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