Data Licensing

1. What this page is for

CheckHazard is a downstream consumer of public hazard data. We don't produce flood maps or fault-line surveys ourselves — we ingest them, clean them, and run them through our scoring formulas. This page lays out where each layer comes from, what license it ships under, and what you can do with the report we generate.

2. Source datasets

3. How we follow the licenses

We attribute every source on the report page and in the site footer. We don't strip metadata or claim authorship of the upstream data. Specifically:

• ODbL layers (NOAH, OpenStreetMap waterways). Our report outputs — the score, the findings, the narrative — are Produced Works under ODbL §4.5(b): they're computed from the data, not a copy of the database. We carry the required attribution wherever a Produced Work is shown, and we do not publish a redistributable copy of the upstream database. If you want to use the underlying NOAH or OSM data directly, get it from the source — links are in Section 2.
• CC BY-SA 4.0 (GEM / PHIVOLCS active faults). Same logic — the fault-proximity finding in a report is a derived metric, not a redistribution of the fault polygons. Share-alike would apply if we ever published a fault dataset; we don't.
• CC BY (admin boundaries). Attribution-only. Boundaries are used to label results (e.g. "Barangay X, Quezon City"); attribution is in the footer.
• Public domain (SRTM elevation). No license obligation. We attribute the source as a courtesy.

4. The map on the report page

The report's hazard map renders polygons (flood, landslide, storm surge) and active faults within roughly two kilometres of the property pin. Those features are fetched on demand, dissolved and simplified server-side for that specific viewport, and shipped as derived geometry — they are not a downloadable copy of the upstream NOAH, OSM, or GEM databases. We treat this output as a Produced Work for ODbL purposes (§4.5b) and as Adapted Material for CC BY-SA (§3a). Attribution for every layer rendered on the map is shown in the map's attribution control and again in the site footer.

We don't expose a bulk geometry endpoint. If you need the original polygons for your own work, please go to the upstream sources — that's both the right answer for license compliance and the right answer for getting the most current version of the data.

5. The CheckHazard report

The structured report you receive — the eleven scoring formulas, the severity rollups, the written narrative, the layout — is © CheckHazard, all rights reserved, except for the portions clearly drawn from the source datasets above. In practice that means:

• You can save a report you paid for, send it to your architect or insurer, attach it to a property listing, or print and file it.
• You can't bulk-collect reports and resell them, build a competing product on top of our scoring output, or strip out attribution and republish the report as your own.

6. API and data access

We don't currently offer a documented public API, bulk export, or commercial licensing tier. The internal endpoints that power the report UI (geocoding, hazard scoring, map features) are rate-limited and intended for the web app, not third-party integration. If you need bulk access for a real project, email us — we'd rather have a short conversation than guess at terms in advance.

7. Attribution we ask for

If you quote or screenshot a report in a public document, please credit it as: "CheckHazard, based on UP NOAH Center / DOST, PHIVOLCS / GEM, OpenStreetMap contributors, PSA NAMRIA, and SRTM elevation."

8. Reporting a data issue

If a report contradicts ground truth — a known flood line missing, a fault buffer that looks wrong — tell us. The fastest fixes happen when someone with local knowledge points to a specific address.