xdggs.HealpixInfo

class xdggs.HealpixInfo(level, indexing_scheme='nested')

Grid information container for healpix grids.

Parameters:

• level (int) – Grid hierarchical level. A higher value corresponds to a finer grid resolution with smaller cell areas. The number of cells covering the whole sphere usually grows exponentially with increasing level values, ranging from 5-100 cells at level 0 to millions or billions of cells at level 10+ (the exact numbers depends on the specific grid).

• indexing_scheme ({"nested", "ring", "unique"}, default: "nested") – The indexing scheme of the healpix grid.

  Warning

  Note that "unique" is currently not supported as the underlying library (cdshealpix) does not support it.

__init__(level, indexing_scheme='nested')

Methods

__init__(level[, indexing_scheme])
cell_boundaries(cell_ids[, backend])	Derive cell boundary polygons from cell ids
cell_ids2geographic(cell_ids)	Convert cell ids to geographic coordinates
from_dict(mapping)	construct a HealpixInfo object from a mapping of attributes
geographic2cell_ids(lon, lat)	Convert cell ids to geographic coordinates
to_dict()	Dump the normalized grid parameters.
zoom_to(cell_ids, level)

Attributes

indexing_scheme	The indexing scheme of the grid
nest	indexing_scheme as the healpy-compatible nest parameter
nside	resolution as the healpy-compatible nside parameter
valid_parameters
level	The hierarchical level of the grid