GeoZarrGeospatial Conventions for Zarr

Modular, composable conventions for storing multidimensional georeferenced grids. Targeting OGC standardization.

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Modular Conventions

Each convention addresses a single concern — CRS, spatial transforms, or multiscale pyramids. Use one or combine them all.

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Uses the Zarr Conventions Framework — UUID-identified, JSON Schema-validated, with a clear maturity path from Proposal to Stable.

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Developed by the OGC GeoZarr Standards Working Group, targeting Architecture Board review by summer 2026.

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Encode coordinate reference systems via EPSG codes, WKT2, or PROJJSON using the proj: namespace.

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Define affine transformations between array indices and geographic coordinates using the spatial: namespace.

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Describe resolution levels and pyramid structures for efficient multi-resolution access.