[GRASS-dev] v.what.strds: timestamp column

[Stefan Blumentrath]

Hei Martin,

What about:
https://grass.osgeo.org/grass78/manuals/addons/v.what.strds.timestamp.html
Written for the IRSAE course at Studenterhytta (Oslo, Norway), in order to e.g. spatio-temporal match temperature timeseries and GPS-tracking data.

Cheers,
Stefan

From: grass-dev <grass-dev-bounces at lists.osgeo.org> On Behalf Of Veronica Andreo
Sent: mandag 15. juni 2020 22:50
To: Martin Landa <landa.martin at gmail.com>
Cc: GRASS developers list <grass-dev at lists.osgeo.org>
Subject: Re: [GRASS-dev] 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 <landa.martin at gmail.com<mailto:landa.martin at gmail.com>> 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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