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| - | ====== Tracks statistics ====== | ||
| - | ===== Gain and loss ===== | ||
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| - | The gain is an important value that helps to appreciate the overall profile of a track. A small gain means that the track is mostly flat, a high gain means you'll have to climb a lot. | ||
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| - | Strictly speaking, | ||
| - | * The **gain** is the sum of all **positive** altitude differences along the track; | ||
| - | * The **loss** is the sum of all **negative** altitude differences along the track. | ||
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| - | In order to compute these values, it's important to define more precisely what means "along the track" | ||
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| - | A first definition would be to take into account **the differences between mountain passes and summits**. If you start a hike at +150m, climb to a summit at +500m, then go back to your start location at +150m, your gain will be 350m. In practice, trails usually don't go straight forward to the summit, but will go uphill for some time, then downhill a little bit, then uphill again, etc. This first definition doesn' | ||