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en:help:v2:landmarks:statistics [2017/03/29 07:25] – alpinequest | en:help:v2:landmarks:statistics [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1 | ||
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- | ====== Details and statistics ====== | ||
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- | Statistics are given in the details page of landmarks. To display the details page: | ||
- | * Click on a track displayed on the map {{: | ||
- | * Select its name {{: | ||
- | * Choose ''" | ||
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- | ===== Statistics ===== | ||
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- | Display the details of a track to get its complete details page, made of | ||
- | * A preview section {{: | ||
- | * A complete statistics section {{: | ||
- | * A list of events occurring during the track {{: | ||
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- | The statistics section is divided in sub-sections: | ||
- | * The overall statistics {{: | ||
- | * Statistics on elevations {{: | ||
- | * Statistics on moving speeds {{: | ||
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- | Click on ''" | ||
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- | ===== Graphics ===== | ||
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- | The statistics details page gives a static preview of the elevation and speed profile. In order to get a fullscreen and dynamic version, click on ''" | ||
- | * Click anywhere on the profile {{: | ||
- | * Click on the ''" | ||
- | * Click on one of the ''" | ||
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- | ===== How to change statistics settings? ===== | ||
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- | You can change various parameters to control the way statistics are computed. To do so, click on the ''" | ||
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- | Parameters you can change are: | ||
- | * ''" | ||
- | * ''" | ||
- | * ''" | ||
- | * ''" | ||
- | * ''" | ||
- | * ''" | ||
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- | ===== How to export statistics and graphics data? ===== | ||
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- | Before computing statistics and displaying graphics of a track, the application will process its raw data (usually recorded using the GPS) based on the chosen settings to remove recording inaccuracies and discrepancies. You can export the processed data in the CSV format: | ||
- | * In the details view of a track, click on the action menu {{: | ||
- | * Select ''" | ||
- | * Choose ''" | ||
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- | ===== Gain and loss computation ===== | ||
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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 only take into account **the altitude 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' | ||
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- | Another definition would then be to take into account **the altitude differences between all the locations that make the track**. Now imagine a track recorded with a GPS along the sea. The GPS, having an imperfect accuracy, will record altitudes of [+1m, +2m, 0m, +1m, -1m, +2m, ...]. With this small segment of 6 locations, we have a gain of +5m. With a track of 1000 locations, it would lead to a gain of more than +800m which is a very **over-estimated gain**, since the track is along a flat shoreline and should have no gain. | ||
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- | At then end, the " | ||
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- | {{: | ||
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- | Here is the effect of the noise reduction on a track profile and gain computation: | ||
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- | * On the left, the noise reduction is disabled. The profile displays the unmodified jagged and spiky altitudes {{: | ||
- | * In the middle, the noise reduction is on ''" | ||
- | * On the right, the noise reduction is on ''" | ||
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