Location Class

Member Function Documentation

[since Esri::ArcGISRuntime 100.8] Location::Location(const QDateTime &timestamp, const Esri::ArcGISRuntime::Point &position, double horizontalAccuracy, double verticalAccuracy, double velocity, double course, bool lastKnown)

Creates a location object with timestamp.

• timestamp - A timestamp when the location was received.
• position - A Point geometry object.
• horizontalAccuracy - The horizontal accuracy in meters. Positive values or NaN are supported.
• verticalAccuracy - The vertical accuracy in meters. Positive values or NaN are supported.
• velocity - The location's velocity in meters per second.
• course - The location's course in degrees (clockwise), 0 being True-North.
• lastKnown - Indicates whether this is an outdated device position retrieved and cached earlier and therefore not guaranteed to represent the current location. Setting this to true will render with the LocationDisplay::acquiringSymbol, typically a grayed out location symbol.

This function was introduced in Esri::ArcGISRuntime 100.8.

[since Esri::ArcGISRuntime 100.14] Location::Location(const QDateTime &timestamp, const Esri::ArcGISRuntime::Point &position, double horizontalAccuracy, double verticalAccuracy, double velocity, double course, bool lastKnown, const QVariantMap &additionalSourceProperties)

Creates a location object with timestamp and additional source properties.

• timestamp - A timestamp when location was received.
• position - A point geometry object.
• horizontalAccuracy - The horizontal accuracy in meters. Positive values or NaN are supported.
• verticalAccuracy - The vertical accuracy in meters. Positive values or NaN are supported.
• velocity - The location's velocity in meters-per-second.
• course - The location's course in degrees (clockwise), 0 being True-North.
• lastKnown - Indicates whether this is an outdated device position retrieved and cached earlier and therefore not guaranteed to represent the current location. Setting this to true will render with the LocationDisplay::acquiringSymbol, typically a grayed out location symbol.
• additionalSourceProperties - A set of key-value pairs providing additional meta-data and properties about the source of this Location.

A Location can be created from a variety of sources and using different technologies. By supplying additionalSourceProperties you can allow users of this Location to find out how the data was captured.

Information should be provided as a set of key-value pairs, where the QString key describes the type of data held in the QVariant value. Values must be basic data types such as string, floating point, integer, boolean or date. You can use any string for the key - but this API recognizes a number of well known keys which should be used if available. See LocationSourcePropertiesKeys:

• "floor" (an integer value). The floor number of the Location when in a building. Use LocationSourcePropertiesKeys::floor to reference this key.
• "satelliteCount" (an integer value). The number of satellites used to fix the Location. Use LocationSourcePropertiesKeys::satelliteCount to reference this key.
• "transmitterCount" (an integer value). The number of transmitters used to create an indoor positioning system (IPS) position. Use LocationSourcePropertiesKeys::transmitterCount to reference this key.
• "positionSource" (a string value). This key can be used to indicate the position source: GNSS, AppleIPS, BLE, WIFI, CELL, IP. GNSS indicates global navigation satellite system and AppleIPS is Apple’s indoor positioning technology. It is possible to have multiple position sources. In that case positionSource is a list with comma-separated values.
• "floorLevelId" (a string value). Unique ID of the feature stored in the levels ArcGISFeatureTable in accordance with the ArcGIS Indoors Information Model. Use LocationSourcePropertiesKeys::floorLevelId to reference this key.

  Keys are case-sensitive.

This function was introduced in Esri::ArcGISRuntime 100.14.

See also additionalSourceProperties.

Location::Location(const Esri::ArcGISRuntime::Point &position, double horizontalAccuracy, double velocity, double course, bool lastKnown)

Creates a location object.

• position - A Point geometry object.
• horizontalAccuracy - The horizontal accuracy in meters. Positive values or NaN are supported.
• velocity - The location's velocity in meters per second.
• course - The location's course in degrees (clockwise), 0 being True-North.
• lastKnown - Indicates whether this is an outdated device position retrieved and cached earlier and therefore not guaranteed to represent the current location. Setting this to true will render with the LocationDisplay::acquiringSymbol, typically a grayed out location symbol.

Location::Location(const Esri::ArcGISRuntime::Location &other)

Copy constructor from other Location.

Location::Location(Esri::ArcGISRuntime::Location &&other)

Move constructor from other Location.

[virtual] Location::~Location()

Destructor.

[since Esri::ArcGISRuntime 100.14] QVariantMap Location::additionalSourceProperties() const

Returns a set of key-value pairs providing additional meta-data and properties about the source of this Location. A Location object can be created manually or by a variety of AbstractLocationDataSource types, for example from the default platform data source or external GPS.

Mobile devices may provide different details about their in-built location services. For example, Android systems can provide data on the number of satellites used to find a position, whereas on iOS this information is not available. When a given property is not available to the data source the entry should be omitted from the additionalSourceProperties.

The additionalSourceProperties provide a means for the creator of a Location object to record flexible information such as:

• The confidence level associated with the location.
• The method used to obtain the location.
• The provenance of the location.

Information is provided as a set of key-value pairs, where the QString key describes the type of data held in the QVariant value. Values must be basic data types such as string, numeric, boolean or date. The creator of the Location can use any string for the key - but this API recognizes a number of well known keys which should be used if available. See LocationSourcePropertiesKeys:

• "floor" (an integer value). The floor number of the Location when in a building. Use LocationSourcePropertiesKeys::floor to reference this key.
• "satelliteCount" (an integer value). The number of satellites used to fix the Location. Use LocationSourcePropertiesKeys::satelliteCount to reference this key.
• "transmitterCount" (an integer value). The number of transmitters used to create an indoor positioning system (IPS) position. Use LocationSourcePropertiesKeys::transmitterCount to reference this key.
• "positionSource" (a string value). This key can be used to indicate the position source: GNSS, AppleIPS, BLE, WIFI, CELL, IP. GNSS indicates global navigation satellite system and AppleIPS is Apple’s indoor positioning technology. It is possible to have multiple position sources. In that case positionSource is a list with comma-separated values.
• "floorLevelId" (a string value). Unique ID of the feature stored in the levels ArcGISFeatureTable in accordance with the ArcGIS Indoors Information Model. Use LocationSourcePropertiesKeys::floorLevelId to reference this key.

Keys are case-sensitive.

This function was introduced in Esri::ArcGISRuntime 100.14.

double Location::course() const

Gets the direction in which the device is traveling.

The direction is measured in degrees starting at due north and continuing clockwise around the compass. Thus, north is 0 degrees, east is 90 degrees, south is 180 degrees, and so on. Course values may not be available on all devices. A negative value indicates that the direction is invalid.

This property will return NaN when the object is empty.

double Location::horizontalAccuracy() const

Gets the radius of uncertainty for the location, measured in meters.

The position identifies the center of the circle, and this value indicates the radius of that circle. A negative value indicates that the position is invalid.

This property will return NaN when the object is empty.

bool Location::isEmpty() const

Returns true if this Location is empty.

bool Location::isLastKnown() const

Gets whether the location information is current or based on a last known update.

Returns true if it is based on last known update. It is considered to be of last known update once the LocationDisplay::acquiringTimeout has passed without an update.

In the case of an empty Location, this will return false.

[since Esri::ArcGISRuntime 100.10] Esri::ArcGISRuntime::LocationType Location::locationType() const

Returns the type of the location.

This property will return Unknown when the object is empty.

This function was introduced in Esri::ArcGISRuntime 100.10.

See also LocationType.

Esri::ArcGISRuntime::Point Location::position() const

Gets the coordinates of the position as a Point.

This property will return a default constructed Point when the object is empty.

[since Esri::ArcGISRuntime 100.8] QDateTime Location::timestamp() const

The time this location was observed.

This property will return a default constructed QDateTime when the object is empty.

This function was introduced in Esri::ArcGISRuntime 100.8.

double Location::velocity() const

Gets the instantaneous speed of the device in meters per second.

This property will return NaN when the object is empty.

[since Esri::ArcGISRuntime 100.8] double Location::verticalAccuracy() const

The vertical accuracy of the location in meters.

This property will return NaN when the object is empty.

This function was introduced in Esri::ArcGISRuntime 100.8.

Esri::ArcGISRuntime::Location &Location::operator=(const Esri::ArcGISRuntime::Location &other)

Assignment operator from other Location.

Esri::ArcGISRuntime::Location &Location::operator=(Esri::ArcGISRuntime::Location &&other)

Move operator from other Location.