Isolation check

Stations that are isolated in space (i.e. no nearby stations) are difficult to QC with spatial methods. In many cases, these should be removed since we have no independent information to verify their accuracy.

The isolation check flags stations that have fewer than num_min buddies within a specified radius [m].

Example

radius = 15000
num_min = 5
flags = titanlib.isolation_check(points, num_min, radius)