request: create polyline through gps tracking

[Rickard9]

i have a request for an funktion.

Use the GPS to create Polylines. So if I walk from A to B, 500 meter the tool would make an poly line from A to B in a existing or new SHP SHP layer/file.

[m-kuhn]

Is the tracking functionality what you are looking for?
https://docs.qfield.org/how-to/tracking/

[Rickard9]

Thanks it is.

However I have now tried it, and there are some problems with it that's make it unusable. (I don't know if this is do to user error, but I don't think so)

1. The GPS possession stutters witch make the line going all places (iPhone 15 Pro) no big houses or trees.
2. the tracking turns of when the screen is turned off or when the app is not "active"

it's nice the function exists but it feels unfinished. I tried the same function on the Mergin Maps app which works great.

[nirvn]

@Rickard9 ,

1/ could you send us a screencast of this? Please open the positioning information panel too so we can see the position details while it stutters

2/ background tracking is an enhancement that will come in early 2025, for the time being, you are correct in identifyign that the phone must remain open.

[m-kuhn]

@nirvn is iPhone included in the early 2025 background tracking?

[nirvn]

@m-kuhn , fair point, sorry, I should have made it clear background tracking will be for Android only to begin with.

Thanks for spotting this lack of clarity.

[Rickard9]

@Rickard9 ,

1/ could you send us a screencast of this? Please open the positioning information panel too so we can see the position details while it stutters

2/ background tracking is an enhancement that will come in early 2025, for the time being, you are correct in identifyign that the phone must remain open.

This is from this morning, I will see if I can recreate this with more information

The red line is the actual path I walked.

[m-kuhn]

Can you open the positioning panel (long press the gps button)?

[Rickard9]

i have not had time to recreate this when walking, however I tried it agen when in a taxi, The car is coming from a 30/km road and accelerating after the turn. note the gps behavior before the turn.

914C6E5C-B266-4F58-8A17-9F052878D708.Copy.mov

i will try to record a better example of the problem.

[m-kuhn]

This is more likely a hardware problem (GNSS antenna) or environment problem (e.g. multipath/reflection issues between buildings), the spike in the first screenshot hints that the position is not stable enough for your expectations.
There is also the potential that CRS/reprojection is not perfectly configured.

I don't think we have enough evidence in here for a software/app problem to leave this open as an issue, but feel free to open a discussion at a community channel

[gis-kmg]

Sorry for being sneaky but with the 'background' tracking function currently being looked at, could the tracking + 'photo gallery' issue be reviewed at the same time? #5610

[m-kuhn]

Sorry for being sneaky but with the 'background' tracking function currently being looked at, could the tracking + 'photo gallery' issue be reviewed at the same time? #5610

The background tracking is the result of a crowdfunding campaign (https://www.opengis.ch/2023/06/29/qfield-background-tracking/) I don't think it is included there.