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manual:user_guide:tools:altitude [2016/01/29 13:52] – mstupka | manual:user_guide:tools:altitude [2016/10/21 16:39] – mstupka | ||
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* **settings of pressure sensor** | * **settings of pressure sensor** | ||
===== Settings ===== | ===== Settings ===== | ||
- | {{ : | + | Contains general switches of offset and pressure sensor and settings of SRTM data assistance and altitude measurement filter: |
- | ==== Altitude offset | + | ==== SRTM data ==== |
- | + | {{ : | |
- | * **Use altitude offset** - switches on the definition of offset between real and GPS altitude. More in the **Offset tab**. | + | * **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**: |
</ | </ | ||
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==== Altitude filter ==== | ==== Altitude filter ==== | ||
- | * **Filter** - applies | + | Applies |
- | + | ===== Altitude offset | |
- | ===== Offset | + | |
{{ : | {{ : | ||
Altitude calculated by internal or external (Bluetooth) 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:// | Altitude calculated by internal or external (Bluetooth) 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:// | ||
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* **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). <wrap info> | * **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). <wrap info> | ||
* **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. |