[aprssig] Can YAAC or APRSIS32 do a CAVE.JPG map?

Andrew P. andrewemt at hotmail.com
Sun Nov 18 13:48:30 EST 2012

It won't be perfect, but I could add this capability to YAAC. The issues depend on the orientation and resolution of such a pixellated map; if it's not axis-aligned, there would be distortion. Similarly, scaling the map up or down relative to its "natural" scale of one pixel per pixel will cause blurry or missing pieces of the map. In general, away from its original resolution, raster map data doesn't scale worth squat. :-)

If you have a copy of the cave map JPG that you could send me for testing, that would be much appreciated. Otherwise, I'll try and get some other map saved as a JPG and try it.

Andrew Pavlin, KA2DDO

> Date: Sun, 18 Nov 2012 11:29:52 -0500
> From: bruninga at usna.edu
> To: aprssig at tapr.org
> Subject: [aprssig] Can YAAC or APRSIS32 do a CAVE.JPG map?
> Can YAAC or APSIS32 accomodate JPG maps easily?
> I need to figure out how to get the Mammoth Cave map into an APRS client.
> The map is geographically correct, but I need to register the LAT/LONG
> from two corner points and then be able to load it and be able to ZOOM
> it during operation.
> The main tour route is 3.5 miles crow-fly, from the old historic
> entrance to the other New Entrance and maybe 6 miles of main tunnel.
> I have see reports of up to 800 feet RF comms along main corridors in
> some caves which would need about 7 hops per mile.  Since Mammoth has
> a cable drop somewhere probably near the middle, then from the middle
> outward and each end inward, we might be able to make it work (caver
> to surface) using the HOP7-7,HOP7-7 path we use along the Appalachian
> trail http://aprs.org/at-golden-packet.html
> The neat thing about cave APRS is that there is ZERO congestion and
> interference and each digi ONLY hears its 2 neighbors.
> Thanks
> Bob, WB4APR
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