# GLO - OpenGeoHub GEDTM30

> GEDTM30: a global bare-earth Digital Terrain Model at ~30 m (1 arc-second) resolution, produced by the OpenGeoHub Foundation.

- **Collection ID:** `glo-ogh-gedtm-30m`
- **Resolution:** 30 m
- **Products:** Digital Terrain Model (ensemble mean), Terrain height uncertainty (ensemble standard deviation)
- **Coverage:** Global
- **Time range:** 2006 – 2015
- **Items indexed:** 1
- **License:** [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/)
- **STAC JSON:** https://api.darly.io/collections/glo-ogh-gedtm-30m

GEDTM30: a global **bare-earth Digital Terrain Model** at ~30 m (1 arc-second) resolution, produced by the OpenGeoHub Foundation.

**Source & method:** A true **Digital Terrain Model (DTM)** — it represents the bare-earth surface, *excluding* buildings and vegetation. Unlike the Copernicus DEM GLO-30 surface model, GEDTM30 is a terrain product. It is built with a global-to-local machine-learning (Random Forest) data-fusion of existing global DEMs corrected against nearly 30 billion high-quality ICESat-2 and GEDI spaceborne-lidar elevation points. Two layers are published: the ensemble mean terrain height and the ensemble standard deviation (a per-pixel uncertainty map).

**Resolution:** 30 m (1 arc-second) nominal, on a single global mosaic (one item, not tiled).

**Coordinate reference:** Geographic WGS84 (EPSG:4326); elevations in meters on the EGM2008 geoid (EPSG:3855).

**Hosting:** Assets reference the public, anonymously readable Cloud-Optimized GeoTIFFs on `s3.opengeohub.org` **in place** — Darly does not re-host or copy the pixels.

**Coverage:** Global (excluding Antarctica).

**Version:** v1.2 (current). New non-breaking versions overwrite this mosaic in place; a breaking change (different resolution/CRS/datum) would get its own collection.

**Documentation:**
- [GEDTM30 repository](https://codeberg.org/openlandmap/GEDTM30)
- [Zenodo dataset (DOI 10.5281/zenodo.14900181)](https://doi.org/10.5281/zenodo.14900181)
- [PeerJ paper (DOI 10.7717/peerj.19673)](https://doi.org/10.7717/peerj.19673)

## Providers

- [OpenGeoHub Foundation](https://opengeohub.org) (producer, processor, host, licensor)
- [Darly](https://darly.io) (processor)

## Citation

Ho, Y., Hengl, T., et al. (2025). GEDTM30: global ensemble digital terrain model at 30 m and derived multiscale terrain variables. PeerJ. Data: https://doi.org/10.5281/zenodo.14900181

## Access

```bash
curl "https://api.darly.io/collections/glo-ogh-gedtm-30m/items?limit=5"
```

Browse it in the [Data Explorer](https://darly.io/explorer) or read the [STAC API docs](https://darly.io/docs/stac).