[Users] extracting GPS accuracy

[Matthias Kuhn]

Hi Sämi,

Unfortunately this is not yet implemented.

I see two different approaches on how to get this information from the
sensor to the data

- Expose it as a variable (@positioning_accuracy) to the attribute form.
The attribute form will need to be configured, so this information is
saved to a feature (via default values).

- Save this information to the m value of vertices. For this to work,
the dataset has to be a format that supports m values. It could then
also be extracted with m($geometry).

The approach with m values has the approach that it works perfectly fine
for line geometries as well. An accuracy value can be saved for each
vertex. The approach with @variables on the other hand is on geometry
level and not on vertex level. Therefore, this would need to save this
information into an array for lines. So if a vertex is deleted on such a
line later on, the information is corrupted easily. On the other hand,
it has the advantage that several values can be saved like other data
coming from positioning sensors (like speed) or from external sensors.
Whereas with m values there is only space for one single value per vertex.

Personally, I tend towards the variable/attribute approach.

Kind regards
Matthias


On 8/31/17 3:33 PM, Wechsler Samuel wrote:
>
> Hi QField-users
>
>  
>
> As far as I know it is possible to get the elevation from GPS by using
> the expression |z($geometry. |Does anyone know if it is also possible
> to extract with QField the GPS-accuracy the moment a point is digitized?
>
>  
>
> Kind regards
>
> Sämi
>
> ____________________________________________________
>
> Samuel Wechsler
>
> Mitarbeiter Brutvogelatlas-Team
>
> Tel. +41 41 462 97 79
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