OCHA Centre for Humanitarian Data

Geospatial Impact Estimates

After a sudden-onset disaster, several agencies publish rapid satellite estimates of what has been damaged — and they disagree. This work measures how far those estimates can be trusted before they inform a response, assembles the open flood-label corpora that training and evaluation depend on, and tracks the imagery that makes any of it possible.

Analysis & tools

Venezuela Earthquake 2026

The damage-product evaluation after the M7.5 earthquake: the scroll story, the technical brief and the multi-event damage exposure viewer, with the briefings, results deck, write-up and earlier versions one level down in an archive.

/venezuela-earthquake-2026/

Vantor Open Data activation tracker

Which disasters Vantor (formerly Maxar) has released open imagery for, and how many pre- and post-event images each activation has. Rebuilt daily from the public STAC catalog, with a live-drift check on every page load.

/vantor-activations/

CEMS-UNOSAT

The two public flood-label corpora, Copernicus EMS rapid mapping and UNOSAT, harvested and catalogued: the combined label viewer, the CEMS archive ledger, and the superseded CEMS-only viewer.

/cems-unosat/

Experimental analysesPassphrase

Exploratory work outside the damage-evaluation line, kept behind its own passphrase: methods still being tested, not products. Currently the Nepal glacier-collapse radar-precursor pages.

/experimental/

What is here. Venezuela Earthquake 2026 is the damage-product evaluation: a single-event case study, with its scope stated on its own page. CEMS-UNOSAT is the flood-label corpora that evaluation and future training draw on. Experimental analyses is exploratory work that has not been through review, kept behind its own gate.

Access. Pre-publication items — the Venezuela archive and the experimental pages — open with a passphrase and are stored encrypted, so this repository being public does not expose them. A passphrase is only as private as the people holding it; the experimental pages have one of their own.

Adding a page? Create a directory under pages/ with an index.html and add a card to the hub it belongs to (Venezuela, CEMS-UNOSAT, experimental), or above if it fits none. See pages/README.md.