The interpolation does not spread the data to where sats have not appeared...
what it effectively does is intelligently make the dots bigger... but only
along the azimuth "axis".
For each elevation angle, it starts at azimuth 0 degrees and searches forward
until it sees a point with signal. It then searches forward up to 22.5 degrees
looking for the next azimuth point at that elevation that has seen signals. If
it finds one, it colors in the arc between those two points (providing that the
arc lies inside the clipping boundaries which prevents spreading the
interpolation to areas that have not seen signals). As more sky data is
collected over time the space between adjacent azimuth points at a given
elevation narrows and less "filling in" occurs.
Attached are two gifs, one of the raw data from 24 hours and the other the
interpolated data. Note that areas near the horizon and to the north where no
sats are seen are not colored. The interpolation gives an excellent
representation of your sky coverage.
----------------------------------------
It is unclear to me that interpolating the data
to areas of the sky where satellites never appear has any utility.
I suppose it makes trends somewhat easier to spot -- but that could also
be done just by making the dots on the raw chart a bit larger, without
suggesting a continuity of reception-space that doesn't exist.
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