cover_from_hull

cover_from_hull(lat, lon, level)

Converts a set of hull vertices to a trixel cover.

Interprets a set of latitudes and longitudes as ring vertices. Then converts the ring into a convex hull. The ordering of the vertices thus is irrelevant. Then tesselates the ring with trixels and returns the according SIDs.

Parameters:

lat: 1D array-like

latitudes of hull vertices. Has to be same length as lon

lon: 1D array-like

longitudes of hull vertices. Has to be same length as lat

level: int

Maximum level of trixels of the cover.

Returns:

range_indices: 1D array-like

SIDs of trixel cover of the hull

Examples

>>> import pystare
>>> lat = [53.75702912049104, 54.98310415304803, 53.69393219666267, 50.128051662794235, 49.01778351500333,                47.62058197691181, 47.467645575544, 50.266337795607285, 51.10667409932158, 53.75702912049104]
>>> lon = [14.119686313542559, 9.921906365609118, 7.100424838905269, 6.043073357781111, 8.099278598674744,                 7.466759067422231, 12.932626987365948, 12.240111118222558, 15.01699588385867, 14.119686313542559]
>>> pystare.cover_from_hull(lat, lon, 3)
array([4251398048237748227, 4269412446747230211, 4278419646001971203,
       4539628424389459971, 4548635623644200963, 4566650022153682947])