Sources and attribution
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Map data and most routes come from OpenStreetMap (© OpenStreetMap contributors, ODbL licence). Routes marked “Editorial” are taken by the HaideHai team from information published by public services — most of them from the route sheets of the county Salvamont services. The badge does not mean the route was checked on the ground. Community content is marked as such; routes proposed by users enter the catalogue only after the team approves them.
Base maps come from OpenFreeMap (on the OpenMapTiles schema) and OpenTopoMap (CC BY-SA), and the map where you pick an outing's meeting point from the OpenStreetMap tile server. Satellite imagery comes from VersaTiles, sourced from AIGA (CC BY 4.0) and Copernicus Sentinel-2 (CC BY 4.0). The relief drawn on the map, meaning hillshading and contour lines, comes from the Mapterhorn terrain model. The elevations of most routes published on HaideHai come from OpenTopoData (SRTM), not from GPS; the same SRTM model fills in tracks without elevation, straight-line segments in the planner and saved places.
Elevation and ascent
On routes imported from OpenStreetMap the whole elevation profile is computed from the terrain model — and with it the ascent, descent, lowest and highest point, and the estimated duration and difficulty. Ascent is added up with a 10 m threshold: smaller height differences are not counted. Otherwise the number would grow by itself the more elevation values we read from the model — it would show how often we read the model, not how much you climb. Numbers already computed have not changed: on older routes ascent is still counted without the threshold. The waymarked-routes layer comes from waymarkedtrails.org (CC BY-SA 3.0).
The weather forecast comes from MET Norway, routing in the planner from BRouter (with OSRM as a fallback) and place search from Photon. Each map credits its sources in the “i” button in its corner.
When you measure on the map, the ascent and descent of the ground under a straight line come from the Mapterhorn terrain model. For most of Romania it uses Copernicus GLO-30 (30 m), a surface model: forests and buildings count towards the elevation. In the west (Apuseni, Retezat, Arad, Oradea) it uses LAKI II, a model of the bare ground. Copernicus licence notice: “produced using Copernicus WorldDEM-30 © DLR e.V. 2010-2014 and © Airbus Defence and Space GmbH 2014-2018 provided under COPERNICUS by the European Union and ESA; all rights reserved”. The organisations in charge of the Copernicus programme by law or by delegation do not incur any liability for any use of the Copernicus WorldDEM-30. For LAKI II: “Date realizate de ANCPI” (data produced by ANCPI), www.geoportal.gov.ro.