Data sources and licences

MapIron keeps each data source in its own database, with a licence record for every source, and combines them only when it answers a request. Every answer names the source it came from. This page lists the sources and the credit each one needs.

Maps and geocoding: OpenStreetMap

Map tiles, static images and geocoding results are built from OpenStreetMap (opens in a new tab) data under the Open Database License (ODbL 1.0). Show © OpenStreetMap contributors near any map or result you display.

Places: Overture Maps Foundation

Results from places search come from the Places data of the Overture Maps Foundation (opens in a new tab). That data contains no OpenStreetMap data and has no share-alike terms. Each result lists its providers in source_datasets and its licences in source_license.

Credit to show: Places: Overture Maps Foundation (overturemaps.org) and its data sources. Sources and licences: https://mapiron.com/attributions#places

Foursquare Open Source Places data is used under the Apache License 2.0 and was transformed to the Overture Maps schema by the Overture Maps Foundation. Licences as listed by Overture (2026-11-12, Overture release 2026-10-21.0 (https://docs.overturemaps.org/attribution/, Places section)). A place whose provider or licence is not in the table above is not served.

Address points: public records

Where OpenStreetMap has no house numbers, address answers can come from public records, and each one names its source. The U.S. Department of Transportation's National Address Database (source us-nad, about 96 million address points from 47 states and DC) is a work of the U.S. Government in the public domain; USDOT asks that it not be used as a mailing list. Credit shown: Addresses: U.S. DOT National Address Database. Montgomery Central Appraisal District addresses appear only in the free look-up tools on this site.

Routing

Routes, matrices and isochrones are computed from OpenStreetMap (opens in a new tab) data (ODbL 1.0) with the open-source Valhalla engine (MIT licence). They are Produced Works: keep the OpenStreetMap credit with them.

Aerial imagery: USDA NAIP

Satellite tiles come from the National Agriculture Imagery Program of the U.S. Department of Agriculture, Farm Service Agency, a work of the U.S. Government in the public domain, read from the copies Microsoft's Planetary Computer hosts. Credit shown: Imagery: USDA Farm Service Agency, National Agriculture Imagery Program.

Terrain

Elevation tiles come from the open Terrain Tiles dataset (Mapzen/Tilezen, on the AWS Open Data registry), which combines: USGS 3DEP (formerly NED), SRTM and GMTED2010, courtesy of the U.S. Geological Survey (public domain); NOAA ETOPO1 (public domain); ArcticDEM (DigitalGlobe imagery, NSF awards 1043681, 1559691 and 1542736); EU-DEM, produced using Copernicus data and information funded by the European Union; Canada CDEM (Open Government Licence – Canada); © Commonwealth of Australia (Geoscience Australia) 2017, CC BY 4.0; DGM Austria (© offene Daten Österreichs, CC BY 3.0 AT); INEGI Mexico, Continental relief 2016; New Zealand LINZ 8 m DEM (Crown copyright, CC BY 3.0 NZ); © Kartverket (Norway), CC BY 4.0; © Environment Agency copyright and/or database right 2015 (UK, Open Government Licence v3). Credit shown: Terrain: USGS 3DEP, SRTM, GMTED2010, NOAA ETOPO1 and national elevation data, with this page.

Parcels, special districts and school data

Parcel lines come from county and state public records published under open terms, Texas special district data from Texas Commission on Environmental Quality, city and Texas Comptroller public records. Each answer carries the attribution to show; the sources are listed in Parcel lines, Texas special districts and Schools & districts.

Questions about a source or a licence: hello@mapiron.com.