A digital elevation model (DEM) is an elevation map which can be used in place of GPS or barometric altitude readings for a more stable reading. The Trail Sense models are generated using ETOPO data. The larger the model, the more accurate it will be. The largest model has a horizontal resolution of 15 arc seconds, which is 1 / 240 degrees or around 400 meters.
Quantiles are calculated using a random sampling of 100 locations. Your results may vary.
The water mask indicates whether a model can distinguish between land and water, which allows map layers to be rendered more accurately.
| Model | 50% Quantile | 90% Quantile | Water Mask | Download |
|---|---|---|---|---|
| High | ± 3m | ± 16m | Yes | Download (310 MB) |
| Medium | ± 8m | ± 24m | No | Download (95 MB) |
| Low | ± 11m | ± 40m | No | Download (21 MB) |
NOAA National Centers for Environmental Information. 2022: ETOPO 2022 15 Arc-Second Global Relief Model. NOAA National Centers for Environmental Information. https://doi.org/10.25921/fd45-gt74. Accessed 2023-05-26.