[Qgis-developer] Stationary objects that change attribute values over time

[Anita Graser]

On Sat, Feb 18, 2017 at 8:41 PM, Anita Graser <anitagraser at gmx.at> wrote:

> Hi,
>
> I'm looking for a better way to handle stationary objects in Time Manager.
> For example, think of a real estate map, where plots of land change value
> over time. The geometries themselves rarely ever change.
>
> Currently. It is necessary to create a join of plot geometries and values
> over time, duplicating geometries and creating potentially huge layers.
>
> So far, my thoughts are going in the direction of creating query layers
> for such cases. The query layer definition could be controlled by Time
> Manager, to always update according to the requested time frame.
>
> Does that sound reasonable? Do you have other ideas or are there any plans
> about adding temporal support to QGIS3 that I should be aware of?
>


​Experiments so far (with 2.18) have turned up that virtual layers don't
seem to support getProvider().minimumValue()
​which makes them unusable in Time Manger.

​Does it make sense to add these functions to virtual layers?

If so, I can go open a ticket.

Best wishes,
Anita
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