Add proportional track point min as satid criteria

[interplanetarychris]

stvid/configuration.ini-dist

Lines 58 to 62 in 57b11b1

	ntrkmin = 10 # Minimum number of points making up a track
	trksig = 5.0 # Track selection sigma
	nstarsmin = 10 # Minimum number of stars to attempt astrometric calibration
	houghrmin = 10.0 # Hough3dLines: Track selection region around prediction (pixels)
	nhoughmin = 10 # Hough3dLines: Minimum track points

stvid currently uses a minimum number of points from raw points or hough3dlines -a configuration option of “proportional track points” would be useful in further limiting false positives.

For example, with a low limit on ntrkmin or nhoughmin induces a number of false positives - many of which have very long "phantom tracks, apparently stitched together from [10] points across the FOV.

A nice feature would be to look for something like “>50% fill” on track points across the image arc, which could be a small number of points for a slow satellite, or a large number of points for a large track.
It would probably still probably be appropriate to also enforce a "minimum" number of points, but this would allow setting the minimum lower.

Looking at how houghpoints works, this looks non-trivial, but I’ll put it in the wishlist anyway as a reminder.