At 13:30 10 August 2015, wrote:
With a typical IGC file at 4MB, that gives around 4000 contacts, which at
f=
irst blush seems like it would be enough to get a good range. 360
degrees=
, more than 10 samples per degree. Unfortunately, the angular sampling
is=
n't necessarily very uniform and the FLARM range analysis only gives you
av=
erage range. There is no indication about the reliability of the range
m=
easurement in any given direction. I need to put some error bars on the
m=
easurement. I would like to be able to draw the same diagram, but with
an
=
inside ring that indicates average minus one standard deviation and an
outs=
ide ring that shows average plus one standard deviation. The current
displ=
ay as portrayed by FLARM is very easy to misinterpret. In order to
reall=
y get the standard deviation down To something reasonable in all
directions=
it really takes a lot of samples. Probably several times that.

If I could interpret it myself, directly from the IGC files, or some
combin=
ation of lots of IGC files I can get a more accurate view of what is
actual=
ly happening.

If you are only interested in the LFLA records, then just cull out the
majority of the B-records. Try www.spsys.demon.co.uk/software/squashigc.exe
with a large interval (try 60seconds).