[aprssig] APRS activity area animation

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Tue Mar 3 07:43:48 EST 2009

Now THAT is really neat!  I've been accumulating all of my 
daily-generated images in the hopes of stringing them together in some 
sort of browsable animation but I haven't had the time to search for 
what display mechanism would be most appropriate.

The US animation really shows up the coverage holes that I've been 
seeing when tracking people up and down the east coast Interstate highways.

Thanks for sharing this long-term APRS data visualization!  Is it 
something you'll be periodically updating and linking to from aprs.fi?  
Not that I'd have any idea where to put said link!

Lynn (D) - KJ4ERJ - Intrigued by all APRS visualization ideas!

Heikki Hannikainen wrote:
>    Inspired by the APRS activity map by Lynn, KJ4ERJ, I've produced some 
> APRS activity plots over longer time frames. These animations cover mobile 
> APRS traffic from March 2008 to the end of February 2009:
>    http://aprs.fi/doc/stats/APRS-traffic-density-US-200803-200902.gif
>    http://aprs.fi/doc/stats/APRS-traffic-density-EU-N-200803-200902.gif
>    Only moving stations are shown here, and i've made an attempt to remove 
> all internet-only stations (based on TCP* paths and the q construct). I 
> haven't removed airplanes, balloons or satellites yet, though.
>    The map shows areas with even a little APRS activity with a red colour, 
> so a single airplane flight is visible as a thin red line. Currently the 
> colour scaling and palette is not really tuned for communicating the 
> relative amount of APRS activity, just the presence of any activity.
>    Also, it doesn't really work as a coverage diagram, because the 
> plotting algorithm doesn't try to estimate any additional areas which 
> might be covered besides the points which were transmitted by trackers, 
> but it does give you *some* idea where APRS network coverage might exist.
>    Larger cities are marked with blue circles.
>    The plots are produced in PostScript vector format and then converted to 
> raster images and animations. If someone would like to publish these in a 
> magazine or something, I can provide customized PostScript plots over 
> specific areas or timeframes.
>    The data comes from the http://aprs.fi/ backend database, which 
> currently covers 12 months of history. I intend to develop the scripts to 
> do plots like this automatically for all APRS active countries and states. 
> Would someone happen to have the dimension coordinates for all the US 
> states (min/max latitude/longitude values which contain the whole state)?
>    - Hessu, OH7LZB (http://aprs.fi/)
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