Positioning (QML)

Location Positioning

Location data involves a precisely specified position on the Earth's surface — as provided by a latitude-longitude coordinate — along with associated data, such as:

• The date and time at which the position was reported
• The velocity of the device that reported the position
• The altitude of the reported position (height above sea level)
• The bearing of the device in degrees, relative to true north

This data can be extracted through a variety of methods. One of the most well known methods of positioning is GPS (Global Positioning System), a publicly available system that uses radiowave signals received from Earth-orbiting satellites to calculate the precise position and time of the receiver. Another popular method is 'Cell Identifier Positioning', which uses the cell identifier of the cell site that is currently serving the receiving device to calculate its approximate location. These and other positioning methods can all be used with the Location API; the only requirement for a location data source within the API is that it provides a latitude-longitude coordinate with a date/time value, with the option of providing the other attributes listed above.

 Rectangle {

     import QtLocation 5.0
     ...

     map : Map {
         // initialize map
         ...
     }

     PositionSource {
         onPositionChanged: {
             // center the map on the current position
             map.center = position.coordinate
         }
     }
 }