rHEALPixDGGS

rHEALPixDGGS is a Python package that implements the rHEALPix discrete global grid system (DGGS): a hierarchical partition of an ellipsoid of revolution into equal-area cells, built on the rHEALPix map projection.

Fig. 1 The resolution 1 cells of the (0, 0)-rHEALPix DGGS on the WGS84 ellipsoid, colored by their resolution 0 cell and labeled with their cell addresses. Left to right: an equatorial view facing the P face; a north polar view, with the circular cap cell N4 surrounded by the four dart cells; an oblique southern view.

Key API entry points

Entry point	Purpose
rhealpixdggs.dggs.RHEALPixDGGS	A grid system on a chosen ellipsoid: cell lookup from points and regions, grid generation, cell areas and widths.
rhealpixdggs.cell.Cell	A single cell: geometry (the centroid as its position, the nucleus that indexes it, vertices, boundary), hierarchy (parents, children), neighbors, and topological predicates.
rhealpixdggs.rhp_wrappers.geo_to_rhp() / rhp_to_geo()	H3-style conversion between longitude-latitude points and cell addresses.
rhealpixdggs.rhp_wrappers.polyfill()	Cells covering a polygon.
rhealpixdggs.rhp_wrappers.linetrace()	Cells touched by a linestring.
rhealpixdggs.rhp_wrappers.cell_ring() / k_ring()	Rings and disks of cells around a cell.
rhealpixdggs.conversion.compact_cells()	Merge complete groups of sibling cells into their parents.
rhealpixdggs.ellipsoids.Ellipsoid	The underlying ellipsoid of revolution (WGS84 and unit-sphere instances predefined).

Table of contents

• Introduction
  • Requirements
  • Installation
  • Usage
  • References
• The utils Module
  • ProjectionFunction
  • auth_lat()
  • auth_rad()
  • my_round()
  • wrap_latitude()
  • wrap_longitude()
• The pj_healpix Module
  • Array inputs
• The pj_rhealpix Module
  • Array inputs
• The ellipsoids Module
  • Ellipsoid
• The projection_wrapper Module
  • Array inputs
• The dggs Module
  • RHEALPixDGGS
  • RingTable
• Choosing N_side
  • Refinement and encoding
  • Shapes and poles
  • Isolatitude rings
  • Side by side
  • Which to choose
  • Larger values
• Isolatitude Rings
  • The property
  • The ring table
  • Reading the rings from the API
  • What the rings give you, and what they do not
• Spherical Harmonics
  • Conventions
  • Synthesis and analysis
  • How high a degree a resolution supports
  • Module reference
• The cell Module
  • Cell
  • RelativePosition
• The conversion Module
  • CellZoneFromPoly
  • compact_cells()
  • compress_order_cells()
  • get_finest_containing_cell()
• The rhp_wrappers Module
  • Line semantics
  • Attributing length to cells
• Export
  • From a query to a file
  • How the GeoJSON meets RFC 7946
  • Module reference
• Zone Sets
  • A set of cells
  • Hierarchy
  • Set operations
  • Relations between sets
  • Geometry of a query
  • Module reference
• Standards conformance
  • Common Spatio-temporal Classes
  • DGGS Core — reference system
  • DGGS Core — functions
  • Equal-Area Earth Reference System
  • Planned work by release

Indices and tables

• Index

• Module Index

• Search Page