Upload a GPX track and get elevations sampled from our terrain model along it: the profile chart, ascent and descent with a smoothing threshold, gradients, a table of points, and CSV and GPX files with ele filled in. Nothing to install, and the calculation is free: without signing in you get up to 10 runs a day, after that we ask you to register — registration is free too, and there is no daily limit once you have signed in.
Elevations come from the Copernicus DEM GLO-30 terrain model with SRTM as a fallback: model nodes stand 30 m apart, and between them the elevation is interpolated. Vertical accuracy is on the order of 2–4 m, and north of the 50th, 60th and 70th parallel the cell grows coarser along the longitude — the answer says so. Over water and where there is no coverage nothing is invented: the point stays empty and a warning comes back with the result.
Terrain data: 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 route geometry is yours — we neither publish nor store it.
From the Copernicus DEM GLO-30 terrain model (30 m between nodes) with SRTM as a fallback where Copernicus is unavailable. Which datasets took part in your particular run is written under the chart and repeated in the CSV and GPX files — the licence requires it.
Without it ascent is counted on every small step, and the terrain model is noisy by a metre or two: on a route of thousands of points that noise adds up to kilometres of phantom climb. The threshold (default 10 m) counts an elevation change only once it exceeds the given value. Zero means do not smooth.
They are not thrown away: if the track carries its own ele values (barometer or GPS), we draw a second dashed curve and count a separate ascent and descent along it — so the gap between the device and the terrain model is visible.
No. About 2–4 m vertically, with 30 m between nodes. Good for hiking and route planning; for engineering design and land survey — no.
The calculation itself is free and needs no sign-in: without registration you get up to 10 successful runs a day — an error in the file or in the parameters does not spend the allowance. The counter is shared across the whole geoanalysis section: runs on other tools spend the same allowance. After that we ask you to register (email and password, or a Google, GitHub, Yandex or VK account); registration is free too, and there is no daily limit once you have registered.
No. The file is accepted, parsed and deleted together with its temporary directory right after the answer; the result comes back in a single response and lives only in your browser.