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24.2. Seguimiento de GPS en Vivo
QGIS can help you do field mapping with a GPS receiver. Such a live tracking operation is done using the GPS Toolbar. Some device configuration may be needed before connecting QGIS and the GPS receiver.
24.2.1. GPS toolbar
The GPS Toolbar provides the main tools to control a live tracking session. It can be activated from . It follows the state of the project, GPS, and current GPS track, and enables actions only when they make sense. Once a device is detected by QGIS, you will be able to interact with it:
Recenter map on GPS location: the map will immediately recenter on the current GPS position regardless of the automatic recentering parameter.
Set destination layer for GPS digitized features: By default, QGIS will Follow active layer for feature digitizing, meaning that GPS digitizing tools will adapt to the layer selected in Layers panel and created features will be stored in it accordingly. While this may be useful in some contexts, it also implies careful interaction with other layers to avoid storing inadvertently features in undesired layers. This option allows you to explicitly indicate a layer for the data storage during the live tracking session, and you could switch depending on your needs. Exposed tools will adapt as well to the selected layer type.
The GPS destination layer is made automatically editable when a feature is being created, and the user is notified accordingly.
actions for feature creation:
Show GPS information: opens the GPS Information panel
a display box for quick access to some GPS information components you may need:
The Settings button opens a drop-down menu with common settings which are expected to be modified mid-session:
Options to control map recentering:
Automatically add track vertices whenever new locations are received from the GPS device.
Automatically save added features: features created from GPS locations are immediately committed to their target layers (skipping the usual layer edit buffer)
Time stamp destination to adjust the field for time fix storage
Log to GeoPackage/SpatiaLite…: When activated, the user will be prompted to select an existing GeoPackage/SpatiaLite file or enter a new file name. A
gps_points
andgps_tracks
table will be created in the file with a predefined structure.All incoming GPS messages will be logged to the
gps_points
layer, along with speed, bearing, altitude and accuracy information from the GPS.When the GPS is disconnected (or QGIS closed), the entire recorded GPS track will be added to the
gps_tracks
table (along with some calculated information like track length, start and end times).Log NMEA sentences…: enables logging all raw NMEA strings from the device to a text file
GPS settings… to access the GPS global options dialog
Truco
Live status bar information on position
When a GPS device is connected and the user moves the cursor over the map canvas, a live status bar message displays the distance and bearing from the cursor to the GPS position. Project distance and bearing settings are respected in this display. On a touch screen device, use a tap-and-hold event to trigger the live status bar message.
24.2.2. GPS Information Panel
For full monitoring of a live GPS tracking in QGIS, you may need to enable the GPS Information Panel ( or press Ctrl+0).
In the top right corner of the GPS Information Panel, you press Connect to initiate connection between QGIS and a plugged-in GPS receiver, or Disconnect them.
In the top left of the panel, following buttons are accessible:
Signal: intensidad de la señal de las conexiones por satélite
Settings: drop-down menu to live tracking options you may need to modify during a session
24.2.2.1. Posición y atributos adicionales
In the Position tab, if the GPS is receiving signals from satellites, you will see your position in latitude, longitude and altitude together with additional attributes.
Latitude
Longitude
Altitude (Geoid): Altitude/elevation above or below the mean sea level
Altitude (WGS 84 ellipsoid): Altitude/elevation above or below the WGS-84 Earth ellipsoid
Geoidal separation: Difference between the WGS-84 Earth ellipsoid and mean sea level (geoid),
-
means mean sea level is below ellipsoidTime of fix
Speed: Ground speed
Direction: Bearing measured in degrees clockwise from true north to the direction of travel
HDOP: Horizontal dilution of precision
VDOP: Vertical dilution of precision
PDOP: Dilution of precision
H accuracy: Horizontal accuracy in meters
V accuracy: Vertical accuracy in meters
3D accuracy: 3D Root Mean Square (RMS) in meters
Mode: GPS receiver configuration 2D/3D mode, can be
automatic
ormanual
Dimensions: Position fix dimension, can be
2D
,3D
orNo fix
Quality: Positioning quality indicator
Status: Position fix status, can be
Valid
orInvalid
Satellites: Count of satellites used in obtaining the fix
Total track length: Total distance of current GPS track
Distance from start of track: Direct distance from first vertex in current GPS track to latest vertex
24.2.2.2. Signal
With Signal tab, you can see the signal strength of the satellites you are receiving signals from.
24.2.3. Conéctese a un GPS Bluetooth para seguimiento en vivo
Con QGIS puede conectar un GPS Bluetooth para la recopilación de datos de campo. Para realizar esta tarea, necesita un dispositivo GPS Bluetooth y un receptor Bluetooth en su computadora.
Al principio, debe permitir que su dispositivo GPS sea reconocido y emparejado con la computadora. Encienda el GPS, vaya al icono de Bluetooth en su área de notificación y busque un Dispositivo nuevo.
En el lado derecho de la máscara de selección de dispositivos, asegúrese de que todos los dispositivos estén seleccionados para que su unidad GPS probablemente aparezca entre los disponibles. En el siguiente paso debería estar disponible un servicio de conexión en serie, selecciónelo y haga clic en el botón Configurar.
Recuerde el número del puerto COM asignado a la conexión GPS como resultado de las propiedades de Bluetooth.
Una vez que se haya reconocido el GPS, realice el emparejamiento para la conexión. Normalmente, el código de autorización es 0000
.
Ahora abra el panel Información GPS y cambie a Pantalla de opciones de GPS. Seleccione el puerto COM asignado a la conexión GPS y haga clic en Conectar. Después de un rato, debería aparecer un cursor que indica su posición.
Si QGIS no puede recibir datos de GPS, entonces debe reiniciar su dispositivo GPS, esperar de 5-10 segundos y luego intentar conectarse nuevamente. Por lo general, esta solución funciona. Si vuelve a recibir un error de conexión, asegúrese de que no tiene otro receptor Bluetooth cerca de usted, emparejado con la misma unidad GPS.
24.2.4. Examples of GPS devices connection in QGIS
24.2.4.1. Utilizando GPSMAP 60cs
MS Windows
La forma más fácil de hacerlo trabajar es usar un software intermedio (software gratuito, no abierto) llamado`GPSGate <https://gpsgate.com/gpsgate-splitter>`_.
Launch the program, make it scan for GPS devices (works for both USB and BT ones) and then in QGIS:
Ubuntu/Mint GNU/Linux
Para Windows la formas más fácil es usar un servidor en medio, en este caso GPSD, de manera
Install the program
sudo apt install gpsd
Luego cargue el módulo del kernel
garmin_gps
sudo modprobe garmin_gps
And then connect the unit and check with
dmesg
the actual device being used by the unit, for example/dev/ttyUSB0
.Now you can launch gpsd
gpsd /dev/ttyUSB0
Y finalmente conectar con la herramienta de rastreo en vivo QGIS.
24.2.4.2. Usando el registrador de datos BTGP-38KM (solo Bluetooth)
Usar GPSD (bajo Linux) o GPSGate (bajo Windows) es sencillo.
24.2.4.3. Usando el registrador de datos BlueMax GPS-4044 (tanto BT como USB)
MS Windows
The live tracking works for both USB and BT modes, by using GPSGate or even without it, just use the Autodetect mode, or point the tool to the right port.
Ubuntu/Mint GNU/Linux
Para USB
El seguimiento en vivo funciona tanto con GPSD
gpsd /dev/ttyACM3
o sin él, conectando la herramienta de seguimiento en vivo de QGIS directamente al dispositivo (por ejemplo /dev/ttyACM3
).
Para Bluetooth
El seguimiento en vivo funciona tanto con GPSD
gpsd /dev/rfcomm0
o sin él, conectando la herramienta de seguimiento en vivo de QGIS directamente al dispositivo (por ejemplo /dev/rfcomm0
).