Module ring#

The module healpix_geo.ring gives for the ring indexation scheme.

Note

The ring scheme is principally given for compatibility. For new applications, prefer healpix_geo.nested.

Coordinates Conversions#

`healpix_to_lonlat`(ipix, depth[, ellipsoid, ...])	Get the longitudes and latitudes of the center of some HEALPix cells.
`lonlat_to_healpix`(longitude, latitude, depth)	Get the HEALPix indexes that contains specific points.
`healpix_to_cartesian`(ipix, depth[, ...])	Get the cartesian coordinates of the center of the given HEALPix cells.
`cartesian_to_healpix`(x, y, z, depth[, ...])	Get the HEALPix indexes that contain specific points.
`vertices`(ipix, depth, ellipsoid[, step, ...])	Get the longitudes and latitudes of the vertices of some HEALPix cells at a given depth.

Interpolation from HEALPix to geographic coordinates.

bilinear_interpolation(longitude, latitude, ...)

Get the cell ids and weights necessary to bilinearly interpolate the given values.

`kth_neighbours`(ipix, depth, ring[, num_threads])	Get the kth ring of neighbouring cells around some HEALPix cells at a given depth.
`kth_neighbourhood`(ipix, depth, ring[, ...])	Get the kth ring neighbouring cells of some HEALPix cells at a given depth.

Find all cells which intersect a region.

`box_coverage`(center, size, angle, depth, *)	Search the cells covering the given box.
`zone_coverage`(bbox, depth, *[, ellipsoid, flat])	Search the cells covering the given bounding box
`polygon_coverage`(vertices, depth, *[, ...])	Search the cells covering the given polygon.
`cone_coverage`(center, radius, depth, *[, ...])	Search the cells covering the given cone
`elliptical_cone_coverage`(center, ...[, ...])	Search the cells covering the given elliptical cone.

angular_distances(from_, to_, depth[, ...])

Compute the angular distances