License // Copyright & credits
License
Copyright and credits
Opisometer is © 2026 Chris Mahlke. All rights reserved.
The app and its source code aren't offered under an open-source license, so no permission is given to copy, modify or redistribute them.
Maps and places
Maps, places, search and directions come from Apple Maps, through Apple's MapKit. The Legal link on the map in the app lists Apple's data providers.
The Topo (US) map comes from The National Map of the U.S. Geological Survey, in the public domain.
Elevation
Elevation, relief, contours and the 3D models come from the Terrain Tiles made by Mapzen and served free by AWS Open Data. Their sources ask for these credits, which the app also shows under Help, then Map and elevation data:
- Mapzen
- ArcticDEM terrain data DEM(s) were created from DigitalGlobe, Inc., imagery and funded under National Science Foundation awards 1043681, 1559691, and 1542736
- Australia terrain data © Commonwealth of Australia (Geoscience Australia) 2017
- Austria terrain data © offene Daten Österreichs – Digitales Geländemodell (DGM) Österreich
- Canada terrain data contains information licensed under the Open Government Licence – Canada
- Europe terrain data produced using Copernicus data and information funded by the European Union - EU-DEM layers
- Global ETOPO1 terrain data U.S. National Oceanic and Atmospheric Administration
- Mexico terrain data source: INEGI, Continental relief, 2016
- New Zealand terrain data Copyright 2011 Crown copyright (c) Land Information New Zealand and the New Zealand Government (All rights reserved)
- Norway terrain data © Kartverket
- United Kingdom terrain data © Environment Agency copyright and/or database right 2015. All rights reserved
- United States 3DEP (formerly NED) and global GMTED2010 and SRTM terrain data courtesy of the U.S. Geological Survey
This website
Set in Google Sans Flex, designed by Google and licensed under the SIL Open Font License.