I am designing a QGIS project for collecting data in the field using Qfield or INPUT as mobile app. So the question is how to know if the surveyor is standing within the parcel when collecting data. I thought that the solution is to calculate the distance between the surveyor's position and the centroid of the parcel, but I couldn't find the formulas to capture the surveyor's position
@position_coordinate - A point with the coordinate in WGS84. Lon, Lat, Altitude as delivered by the sensor. It is only available when the crosshair is snapped to the sensor.
Here you can find more information: https://qfield.org/docs/de/prepare/attributes-form.html#additional-variables