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| en:help:geolocation [2013/08/24 13:42] – alpinequest | en:help:geolocation [2013/08/24 14:11] – psyberia |
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| Most devices now have a GPS chip which is used to compute this location. GPS provides a precise location, and doesn't need to use any network. However it must have access to the sky. Alternatively, you can use another location provider if your device doesn't have a GPS chip. | Most devices now have a GPS chip which is used to compute this location. GPS provides a precise location, and doesn't need to use any network. However it must have access to the sky. Alternatively, you can use another location provider if your device doesn't have a GPS chip. |
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| {{ :en:help:1.3:src_geolocation_submenu.png?nolink|}} | {{ :en:help:1.4:src_geolocation_submenu.png?nolink|}} |
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| ===== How to use the Localisation? ===== | ===== How to use the Localisation? ===== |
| * Open the Geolocation sub-menu, and click on the ''**Activate**'' button {{:icon_02.png?nolink|}}. | * Open the Geolocation sub-menu, and click on the ''**Activate**'' button {{:icon_02.png?nolink|}}. |
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| {{:en:help:1.3:src_geolocation_information_unfixed.png?nolink |}} | {{:en:help:1.4:src_geolocation_information_unfixed.png?nolink |}} |
| The GPS will then try to compute your location based on the information retrieved from GPS satellites. | The GPS will then try to compute your location based on the information retrieved from GPS satellites. |
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| The localisation information box let you know how much satellites have been found yet. In this case, ''**0/5sats**'' means that ''**5**'' satellites have been found in the sky, but ''**0**'' are being currently used. It means that the current location haven't been computed yet. | The localisation information box let you know how much satellites have been found yet. In this case, ''**0/5sats**'' means that ''**5**'' satellites have been found in the sky, but ''**0**'' are being currently used. It means that the current location haven't been computed yet. |
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| In some cases, AlpineQuest can reuse a previously computed location while the new one is being computed. In this case, the old location is displayed in red like in the previous screen-shot. | In some cases, the application can reuse a previously computed location while the new one is being computed. In this case, the old location is displayed in red like in the previous screen-shot. |
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| When the application is sent in the background (like when another one is started), the localisation is temporarily deactivated to save battery. | When the application is sent in the background (like when another one is started), the localisation is temporarily deactivated to save battery. |
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| ===== Elevations in AlpineQuest ===== | ===== Elevations management ===== |
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| The elevation of a point is the difference between the altitude of this point and a reference surface of altitude 0 (also called "sea level"). | The elevation of a point is the difference between the altitude of this point and a reference surface of altitude 0 (also called "sea level"). |
| Based on this choice, GPS's "WGS84" elevations are a good approximation at the Earth scale, but compared to per-country systems elevations, we can have discrepancies up to 50m. | Based on this choice, GPS's "WGS84" elevations are a good approximation at the Earth scale, but compared to per-country systems elevations, we can have discrepancies up to 50m. |
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| **To reduce these discrepancies and provide more precise elevations, AlpineQuest convert all GPS elevations towards another system using a more precise shape of the Earth, called [[http://en.wikipedia.org/wiki/Geoid|Geoid]]. However, some slight discrepancies can still be found.** | **To reduce these discrepancies and provide more precise elevations, the application convert all GPS elevations towards another system using a more precise shape of the Earth, called [[http://en.wikipedia.org/wiki/Geoid|Geoid]]. However, some slight discrepancies can still be found.** |
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| {{:icon_help.png?nolink}} You can find a detailed article of the shape of the Earth on [[http://en.wikipedia.org/wiki/Figure_of_the_Earth|Wikipedia]]. | {{:icon_help.png?nolink}} You can find a detailed article of the shape of the Earth on [[http://en.wikipedia.org/wiki/Figure_of_the_Earth|Wikipedia]]. |
