The distance or elevation data not precisely
what you expect for this route?
Data from a GPS device can be rough, especially in
areas where the terrain (trees, canyons) interfere
with GPS signals. And routes drawn on our maps are
reliant on people marking trails from satellite
images -- the details of which can be hidden by trees.
Elevation can be tricky too.
Elevation data is stored on spaced topographical
lines, and determining the elevation of a point
requires computers to estimate based on how close the
point is to the topographical line.
We mitigate this by calculating distance in
3-D (think Pythagorean theorem) and using mathematical
techiniques to smooth the elevation data. We come
close, but no one can be perfect with imperfect data,
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Surface detail information for this course is unavailable.Learn more.
Surface detail information
HelloDrifter takes a few minutes to obtain surface detail information for every course created on the site. When present, clicking the "information" icon on the right of the map will cause sections of the course to display whether they are path, road, gravel, or dirt.
Please note that this feature is not available everywhere in the world (yet). We currenly support North America, Australia, and Europe. Even then, surface details aren't available unless the course matches data that is available in OpenStreetMap. (Typically, this means that we can't get surface details for very remote courses or courses with imprecise GPX data.)
If you have any questions, contact us through the link at the bottom of the page.
Route favorited by:
Los Gatos, California, United States
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