The Travel Distance Layer shows you how far you can go within a specified time.
When the Travel Distance Layer is selected, you will see it on the map as a colour-coded layer spread out from one starting point. The rest of the map will be dark while you have the Travel Distance layer selected.
For example, if the time is set to 1 hour and the activity hiking is selected, the layer will show you everywhere you can hike to on the map within that 1 hour. You will see that the steeper the slope upwards, the shorter the distance you can travel in that time, as you are slower when hiking up inclines.
You can also see that there is an outer band of colour of the map - this indicates the sunrise/sunset time.
To access this layer:
1. Click the Terrain Tools button on the bottom right-hand side of the screen.
2. Select the Travel Distance Layer button.
3. You can click and drag the starting point to your desired position on the map
4. Use the Duration Slider to set the time duration. The Duration Slider also shows you how long until sunset, based on your position on the map.
Note - currently the Travel Distance Layer is available on web for the Hiking activity only. It will be coming soon to mobile and for other activities.
The time is estimated based only on the geometrical properties of the surface, i.e. distances and gradient of the terrain. Surface properties (like bush, swamps, etc) or crossing of rivers, streams and fences, etc are not taken into account.
The Travel Distance Layer is calculated the same way as estimated time for adventures, i.e. using Tobler’s hiking function.
The estimated time for hiking is calculated using Tobler’s hiking function with default parameters (https://en.wikipedia.org/wiki/Tobler%27s_hiking_function). This means that speed on flat surfaces is estimated to be 5km/h and maximum speed of 6km/h is achieved when going downhill at 2.86 degrees.
The displayed sunset/sunrise time and the line for it on the map are approximations, i.e. the shape of the mountains is not taken into account, thus some areas of a mountain get into shadow sooner than the displayed sunset time.