Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
en:help:geolocation [2013/08/24 13:42] – alpinequest | en:help:geolocation [2013/08/24 14:10] – psyberia |
---|
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. |
| |
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. |
| |
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. |
| |
| |
===== Elevations in AlpineQuest ===== | ===== Elevations management ===== |
| |
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. |
| |
**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.** |
| |
{{: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]]. |