Editing TEHCC Wiki:Trail Elevations
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'''Trail Lows and Highs''' are as simple as it sounds. If using a GPS points or tracks, having the points locked to USGS data is preferred to remove GPS error. | '''Trail Lows and Highs''' are as simple as it sounds. If using a GPS points or tracks, having the points locked to USGS data is preferred to remove GPS error. | ||
'''Trail elevations and elevation changes''' is trickier than one would initially believe. All sorts of factors can affect the calculation. For a detailed explanation of this difficulty you can visit the [http://www.gpsvisualizer.com/tutorials/elevation_gain.html GPS Visualizer website]. This can explain in detail these problems, but suffice to say there is a compounding of GPS accuracy and deciding what constitutes an elevation gain. | '''Trail elevations and elevation changes''' is trickier than one would initially believe. All sorts of factors can affect the calculation. For a detailed explanation of this difficulty you can visit the [http://www.gpsvisualizer.com/tutorials/elevation_gain.html GPS Visualizer website]. This can explain in detail these problems, but suffice to say there is a compounding of GPS accuracy and deciding what constitutes an elevation gain. (is walking a trail with 100 ten foot ups-and-downs the same as walking the same distance but ending 1,000' higher?). | ||
This website is trying to "standardize" on using the calculations available on GPS Visualizer using the recommendations with a 10m gain threshold (~32.8') and 5m trackpoint distance threshold, while locking elevation data to USGS data. This is up for discussion and will need to compare with how others "feel" the trails are in terms of elevation changes. | This website is trying to "standardize" on using the calculations available on GPS Visualizer using the recommendations with a 10m gain threshold (~32.8') and 5m trackpoint distance threshold, while locking elevation data to USGS data. This is up for discussion and will need to compare with how others "feel" the trails are in terms of elevation changes. | ||
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* Expand Advanced Options for Track/line options | * Expand Advanced Options for Track/line options | ||
* Add "Trackpoint distance threshold" of "5" - meters | * Add "Trackpoint distance threshold" of "5" - meters | ||
* Find your GPS track either locally or providing a link | * Find your GPS track either locally or providing a link | ||
* Select "Draw the Profile" | * Select "Draw the Profile" | ||
* Collect the information and save the profile picture for adding to the trail page | * Collect the information and save the profile picture for adding to the trail page | ||