Module nested

The module healpix_geo.nested gives functions for the nested indexing scheme.

Coordinates Conversions

Conversions between geographic coordinates and HEALPix indices.

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.
vertices(ipix, depth, ellipsoid[, step, ...])	Get the longitudes and latitudes of the vertices of some HEALPix cells at a given depth.

See also

Tutorial complete : Advanced coordinate conversion

Hierarchy and neighborhood

Navigation in the hierarchical structure of HEALPix.

kth_neighbourhood(ipix, depth, ring[, ...])	Get the kth ring neighbouring cells of some HEALPix cells at a given depth.
zoom_to(ipix, depth, new_depth[, num_threads])	Change the resolutions the given cell ids
siblings(ipix, depth[, num_threads])	Find the siblings for every cell

See also

Complete tutorial : Hierarchical Indexing

Cover Requests

Find all the cells which intersect a region.

zone_coverage(bbox, depth, *[, ellipsoid, flat])	Search the cells covering the given bounding box
box_coverage(center, size, angle, depth, *)	Search the cells covering the given 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.
internal_boundary(depth, ipix)	Extract the internal boundary from a list of cells

See also

Complete tutorial : Cover requests

Distance Calculations

Calculate distances between HEALPix cells.

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

Compute the angular distances between cell centers

Indexes and data structure

Classes to manipulate HEALPix cell sets.

RangeMOCIndex()

range-based index of healpix cell ids