Re: v.what.strds: timestamp column

Hi Martin,

Afaik, v.what.strds is just a wrapper for v.what.rast for all the maps in
the raster time series. It does not consider the column time in the vector.
Then there's t.vect.what.strds that uses a space-time vector data set
(STVDS) to query a STRDS, but in my opinion to create a STVDS is a bit of a
hassle (one vector map per date).

The only module that I'm aware of that takes a vector with dates to query a
STRDS is Luca's add-on t.rast.what.aggr (
https://grass.osgeo.org/grass78/manuals/addons/t.rast.what.aggr.html), but
it's aim is to get aggregates before or after the dates provided in the
vector.

HTH,
Vero

El lun., 15 jun. 2020 17:20, Martin Landa <[email protected]> escribió:

> Hi,
>
> I am playing with `v.what.strds` in order to get space-time-related
> nearest raster value information from strds based on given timestamp
> stored in attribute table.
>
> Input: vector map with timestamp column, eg:
>
> cat|time
> 6|2020-01-08 03:00:00
>
> Goal: get a single raster value from strds based on timestamp.
>
> cat|time|value
> 6|2020-01-08 03:00:00|253
>
> Instead of that v.what.strds returns a new column for each raster map
> registered in strds.
>
> cat|time|map_1,map_2,map_3
> 6|2020-01-08 03:00:00||253|
>
> Is there any other tool which could do the job or should I modify
> v.what.strds in order to solve this task? Eg.
>
> v.what.strds time_column=time ...
>
> Thanks for in advance, Martin
>
> --
> Martin Landa
> http://geo.fsv.cvut.cz/gwiki/Landa
> http://gismentors.cz/mentors/landa
> _______________________________________________
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