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Other Implementations

Besides DGGRID and dggrid4py, these libraries support IGEO7.

ToolLanguageRole
DGGALC, with bindingsNative DGGS library; IGEO7 as ISEA7H_Z7
py4dggsPythonPure-Python DGGS reference library, designed after DGGAL
webDggridJavaScript (WebAssembly)DGGRID for the browser and Node.js; the engine of the explorer on this site
duck_dggsSQL (DuckDB)DuckDB extension with DGGRID functions and Z7 arithmetic
DggridRunners.jlJuliaRuns DGGRID, the Julia equivalent of dggrid4py
IGEO7.jlJuliaZ7 index arithmetic and neighbour traversal
DiscreteGlobalGrids.jlJuliaSeveral grid systems, IGEO7 among them, behind one interface

DGGAL​

DGGAL, the Discrete Global Grid Abstraction Library, provides a common interface for operations on many discrete global grid reference systems. It supports IGEO7 through its ISEA7H_Z7 grid, which uses Z7 indexing for interoperability with DGGRID. ISEA7H_Z7 uses the 11.2 orientation and applies the authalic latitude conversion itself.

py4dggs​

py4dggs is a pure-Python, multi-grid DGGS reference library with zero runtime dependencies. It is designed after DGGAL and verified against DGGAL's Python binding. IGEO7 with Z7 digit IDs is one of its grids, next to other aperture-7 and aperture-3 hexagonal grids.

webDggrid​

webDggrid is DGGRID compiled to WebAssembly, for the browser and Node.js. It converts coordinates to cells and back, exports grids as GeoJSON, and has bit-level operations on the 64-bit Z7 index (parent, neighbours, encode and decode). It is the engine behind the Interactive Explorer on this site. As with DGGRID itself, the IGEO7 orientation and the authalic conversion have to be set explicitly, which the explorer page describes.

duck_dggs​

duck_dggs is a DuckDB community extension powered by DGGRID v8. It brings DGGRID's coordinate, cell and hierarchy functions into SQL, together with Z7 arithmetic on the packed index (igeo7_parent, igeo7_get_neighbours, igeo7_to_string and others) and the authalic conversion (igeo7_geo_to_authalic, igeo7_authalic_to_geo). Its default grid is ISEA4H, so the IGEO7 grid is selected through dggs_params.

DggridRunners.jl​

DggridRunners.jl is the Julia equivalent of dggrid4py: an executor for the DGGRID command-line tool that exposes its high-level operations (grid generation, coordinate and address conversion) as Julia functions. Like dggrid4py it needs a DGGRID binary.

IGEO7.jl​

IGEO7.jl implements the Z7 index itself in Julia: encoding and decoding, hierarchy, and neighbour traversal with Generalized Balanced Ternary (GBT) and Central Place Indexing (CPI) arithmetic. It works on the integer index only and needs no DGGRID. Its Python counterpart is z7py.

DiscreteGlobalGrids.jl​

DiscreteGlobalGrids.jl is a JuliaGeo package that brings several grid systems into the Julia geo ecosystem behind one interface, IGEO7 among them (IGeo7System()), next to H3, HEALPix, A5, S2 and ISEA4R. It locates cells, follows neighbours and parent–child relationships, regrids rasters, and works with DimensionalData arrays and Zarr stores.