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manual:user_guide:tools:altitude [2015/04/02 12:58] – mstupka | manual:user_guide:tools:altitude [2022/04/08 11:54] (current) – mstupka | ||
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- | ====== Altitude Manager ====== | + | {{ : |
---- | ---- | ||
===== About ===== | ===== About ===== | ||
+ | <wrap box>Menu > Settings > GPS and location > Altitude manager</ | ||
+ | |||
Altitude manager enables to fine-tune obtaining altitude values from your mobile device. It is divided into three main tabs: | Altitude manager enables to fine-tune obtaining altitude values from your mobile device. It is divided into three main tabs: | ||
* **main settings** | * **main settings** | ||
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* **settings of pressure sensor** | * **settings of pressure sensor** | ||
===== Settings ===== | ===== Settings ===== | ||
- | + | Contains general | |
- | ==== Altitude offset ==== | + | ==== SRTM data ==== |
- | + | {{ : | |
- | * **Use altitude offset** - switches | + | * **No usage** - altitude |
- | ==== Pressure sensor | + | * **Optimize GPS altitude** - uses [[http:// |
- | + | * **Replace GPS values** - uses [[http:// | |
- | * **Use pressure sensor** - switches on measuring precise | + | |
- | ==== Elevation data ==== | + | |
- | * **Optimize GPS altitude** - uses [[http:// | + | |
<WRAP round alert > | <WRAP round alert > | ||
- | **Warning for pilots**: | + | **Warning for pilots**: |
</ | </ | ||
- | |||
- | |||
==== Altitude filter ==== | ==== Altitude filter ==== | ||
- | * **Filter** - applies | + | Applies |
- | + | ===== Altitude offset | |
- | ===== Offset | + | {{ : |
- | + | Altitude calculated by internal | |
- | Altitude calculated by internal GPS unit is related to a different method of referencing the Earth surface than that used in maps. The difference between them is called **Geoid height** which is distance between [[http:// | + | |
Locus Map can define this offset by three methods: | Locus Map can define this offset by three methods: | ||
* **Manual correction** - basic method used when the exact offset value is known | * **Manual correction** - basic method used when the exact offset value is known | ||
- | * **Automatic correction** - method used in most cases - Locus Map can compute offset of the whole world from a Geoid model. This method is accurate enough for use in mobile phones and sufficiently precise for all locations (the offset slightly varies based on location). | + | * **Automatic correction** - method used in most cases - Locus Map can compute offset of the whole world from a Geoid model. This method is accurate enough for use in mobile phones and sufficiently precise for all locations (the offset slightly varies based on location). |
* **Altitude NMEA correction** - mobile device communicates with GPS unit over a special messages called NMEA. These messages contain values of Geoid height that Locus Map can read and apply them to correct this offset.< | * **Altitude NMEA correction** - mobile device communicates with GPS unit over a special messages called NMEA. These messages contain values of Geoid height that Locus Map can read and apply them to correct this offset.< | ||
- | ===== Pressure | + | * **Enable also for Bluetooth GPS** - check this option if you use external GPS device |
+ | |||
+ | ===== Pressure | ||
+ | {{ : | ||
Some devices are equipped with barometric pressure sensor. Barometric sensors measure atmospheric pressure very precisely which can be used for calculating relative altitude changes. I.e. if you know certain pressure at certain altitude you can calculate altitude changes between known and current position. | Some devices are equipped with barometric pressure sensor. Barometric sensors measure atmospheric pressure very precisely which can be used for calculating relative altitude changes. I.e. if you know certain pressure at certain altitude you can calculate altitude changes between known and current position. | ||
The pressure sensor must be calibrated to a known altitude value so that it can be used for real altitude value calculations. Locus Map offers several methods: | The pressure sensor must be calibrated to a known altitude value so that it can be used for real altitude value calculations. Locus Map offers several methods: | ||
- | * **Automatic** - Locus Map uses GPS altitude or SRTM files altitude and current barometric pressure as basic values and relates all other measurements to these values. It also checks measured values in 2 hour intervals and eventually re-calibrates the pressure sensor.<wrap info> | + | * **Automatic** - Locus Map uses GPS altitude or SRTM files altitude and current barometric pressure as basic values and relates all other measurements to these values. It also checks measured values in 2 hour intervals and eventually re-calibrates the pressure sensor. |
- | * Pressure at sea level - | + | * **Pressure at sea level** - current pressure value at a particular sea level as the reference can be obtained from the Internet. The resulting altitude calculation |
+ | * **Altitude** - uses some other source of ground altitude - external maps, measuring, tourist guide posts, etc. as the reference. | ||
+ | < | ||
+ | </WRAP> |