Use Tracking to create polygon in QField

Ask the Community
1

Anyone have issues when running a tracking session to create a polygon layer, on Android?

I can start tracking, creating a polygon as I walk, and it works for several minutes. However it seems to crash or lose data and stall - sometimes telling me it’s processing the points.

Anyone else have issues?

2

do you have a rough estimate of what amount of time and area the session has covered when it starts crashing?

3

5-10 minutes and after walking about 200m - so the area is small, maybe 200m2.

I wonder is it to do with the amount of points getting created to create the polygon - its possibly too much via tracking?

4

This worked perfectly, prior to large App update in early Dec.

My work around is to create waypoints (via QField or Handheld GPS) and then create the polygon once back at desk.

5

will try a similar travel and report back. I’ll be testing with a pretty midrange phone. How frequent (in time and space) are the points you are making?

6

are you writing into a geopackage? using a polyline/polystring type?

7

ok, did a small walk to test, no problems saving and even syncing back to qgis.

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The parameters of the test:

  • Runtime: roughly 1 to 2 hours.
  • Add point to line when at least 60 seconds AND 10m of distance has passed since the last vertex.
  • Online layers disabled while walking (don’t know if it hurts anything, but it sure is not needed).
  • Polygon reconstructed in QGIS, on qfield I was writing to a LineString layer inside of a geopackage.
  • Phone inside a light pocket on my trousers.