Files are read locally, with no account or GPX upload to a server. Converting a new landscape downloads public elevation data using its map area. Internet access is needed for new areas. The included Wilmslow example works offline.
Open Start GPX Terrain.command in the supplied folder to enable England’s LiDAR service. Opening this HTML directly supports worldwide terrain and the included example. High detail retains 1 m LiDAR where the landscape is small enough; larger landscapes are resampled. Worldwide terrain combines surveys of varying resolution, so mesh spacing is not survey accuracy. Routes are draped on terrain, not on the watch’s recorded altitude.
Roads, buildings and water come from OpenStreetMap via Overpass. Lakes and reservoirs use mapped outlines; rivers and streams use mapped lines with approximate widths. Water follows the terrain surface; it is not a simulated water level. The map-area coordinates are sent to that service; your GPX stays local. Mapped roads and paths are draped on the terrain with approximate widths; tunnel roads are omitted and bridge decks are not reconstructed. Buildings use mapped footprints, including courtyards, with flat roofs and terrain-anchored foundations. Height tags are used when present; otherwise heights are estimated from storeys (3 m each) or building type. These are approximate building shapes, not surveyed architectural models. Boundary-crossing or incomplete footprints are omitted. Map detail is supported for landscapes up to 25 km across and 100 km², with a 10,000-building limit. Map detail is included in exports when visible.
GPX tracks and routes are supported, including separate segments. Limits: up to 12 files, 40 MB total, 200,000 combined recorded points, 1,500 km landscape span, and latitudes 85°S–85°N. Very large files may need splitting or Balanced detail. Missing terrain or connection failures leave the previous model in place. GLB exports are surface meshes. 3MF exports combine terrain, roads and buildings into a solid height-field base, with the GPX route as a separate closed object in the same assembly, sampled along up to 601 grid points on its longest side. Roads are raised at least 0.3 mm and the route at least 0.6 mm for printing; fine detail, vertical facades and overhangs are approximated. The longest side defaults to 200 mm. Select the part named GPX route to assign a different filament; preserve the assembly alignment on import. Colour/material labels are included, but automatic filament assignment is slicer-dependent. GLB uses explicit PBR materials. OBJ includes an MTL file: extract both to the same folder and import the OBJ with materials enabled. Model units are metres; X east, Y up, Z south. Worldwide horizontal distances use a local scale approximation.
England: Environment Agency LiDAR Composite DTM 1 m (2022). © Environment Agency copyright and/or database right 2022. All rights reserved. Open Government Licence v3.0.
Worldwide: Mapzen / AWS Terrain Tiles, an aggregation of regional elevation surveys. Source attribution and licences.
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* 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.
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Viewer: Three.js r128 and OrbitControls (MIT); GeoTIFF.js 2.1.3 (MIT); Proj4js 2.12.1 (MIT); osmtogeojson 3.0.0-beta.5 (MIT). Frame lettering uses DejaVu Sans; see Frame-font-licence.txt.
