[aprssig] Link for "Polygon and Line OBJECTS" spec

Tom Russo russo at bogodyn.org
Tue Nov 1 15:34:47 CDT 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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> 
>     
>     
> 
>     
>   

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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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