data api · Global

DEM-Terrain

Global terrain data (elevation, slope, aspect) pre-computed on H3 hexagonal grids, stored as Parquet files for fast spatial queries. https://walkthru.earth/indices?section=terrain

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What's in it

Data offered docs-verified: terrain elevation (elev, m) · slope (degrees) · aspect (degrees) · Terrain Ruggedness Index (tri, m) · Topographic Position Index (tpi, m)
Coverage docs-verified: Global land coverage, 65°S–85°N (source GEDTM-30m)
Resolution docs-verified: Source DEM 30 m; H3 resolutions 1–10 (one file per resolution); DEM sampled at ~500 m for res 1–5, ~110 m for res 6–7, native ~30 m for res 8–10
Formats docs-verified: Apache Parquet
Access docs-verified: Public, anonymous HTTPS/S3 access via data.source.coop; licence CC BY 4.0 (walkthru.earth)

Useful for

Use cases llm-inferred: Preliminary slope and ruggedness screening of road or drainage alignment options across a study area using cell-centre terrain values · Topographic position (TPI) and aspect layers as context for FRA or drainage flow-path screening where no local DEM is available · Terrain context layers for BNG or ecological habitat baseline mapping at catchment scale
Audience llm-inferred: GIS analysts · hydrologists · civils engineers · drainage engineers · planners

Limitations

Constraints llm-inferred: Very large dataset: ~287 GB and ~10.5 billion cells in total; the res 10 file alone is 244.7 GB, so filter by H3 range or resolution · Values are point samples at H3 cell centres via bilinear interpolation, not a continuous raster · Coarse inputs at low resolutions: res 1–5 sampled from ~500 m DEM, res 6–7 from ~110 m · v2 (recommended) drops geometry, lat and lon columns; coordinates need the DuckDB h3 community extension · v1 (legacy) requires the DuckDB spatial extension · Global product with no UK-specific accuracy or vertical datum stated in the docs · Source DEM is GEDTM-30m; no time span or update cadence is documented

Licence: see product README
Authentication: Public; anonymous HTTPS/S3 access via data.source.coop
GitHub stars: Unknown
Last commit: Unknown
Last successful page check: 14/10/2026
Page health: page reachable
Package: Not recorded
Verification: Not independently verified

Provenance & evidence

Verified via Source Cooperative API /api/v1/products/walkthru-earth (public product, updated 2026-03-11).

Metadata observed 14/10/2026 · research sweep: manual-2026-10-15 (source.coop)