t.vect.what.strds - GRASS GIS manual
Author: GRASS Development Team
Description: t.vect.what.strds: Stores raster map values at spatial and temporal positions of vector points as vector attributes.
Keywords: temporal, sampling, vector, time

## NAME

t.vect.what.strds - Stores raster map values at spatial and temporal positions of vector points as vector attributes.

## KEYWORDS

temporal, sampling, vector, time

## SYNOPSIS

t.vect.what.strds
t.vect.what.strds --help
t.vect.what.strds input=name strds=name [column=string] method=string [where=sql_query] [t_where=sql_query] [sampling=name[,name,...]] [--help] [--verbose] [--quiet] [--ui]

### Flags:

--help
  Print usage summary
--verbose
  Verbose module output
--quiet
  Quiet module output
--ui
  Force launching GUI dialog

### Parameters:

input=name [required]
  Name of the input space time vector dataset
strds=name [required]
  Name of the input space time raster dataset
column=string
  Name of the vector column to be created and to store sampled raster values
  The use of a column name forces t.vect.what.rast to sample only values from the first map found in an interval. Otherwise the raster map names are used as column names
method=string [required]
  Aggregate operation to be performed on the raster maps
  Options: disabled, average, count, median, mode, minimum, min_raster, maximum, max_raster, stddev, range, sum, variance, diversity, slope, offset, detcoeff, quart1, quart3, perc90, quantile, skewness, kurtosis
  Default: disabled
where=sql_query
  WHERE conditions of SQL statement without 'where' keyword
  Example: income < 1000 and population >= 10000
t_where=sql_query
  WHERE conditions of SQL statement without 'where' keyword used in the temporal GIS framework
  Example: start_time > '2001-01-01 12:30:00'
sampling=name[,name,...]
  The method to be used for sampling the input dataset
  Options: start, during, overlap, contain, equal, follows, precedes
  Default: start

## DESCRIPTION

The module t.vect.what.strds samples a space time raster dataset (STRDS) at the spatio-temporal locations of a space time vector dataset (STVDS).

## EXAMPLE

The example is based on the space time vector dataset "precip_stations@climate_2009_2012" created in the t.vect.observe.strds example. In the example below, the module fills the new column "new_temp" with values extracted from the "tempmean_monthly" space time raster dataset:

    t.vect.what.strds input=precip_stations@climate_2009_2012 \
                      strds=tempmean_monthly@climate_2009_2012 \
                      column=new_temp method=average

## SEE ALSO

r.univar, v.univar, v.what.rast, v.what.rast3, v.what.strds, v.what.vect, t.create, t.info

## AUTHOR

Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

## SOURCE CODE

Available at: t.vect.what.strds source code (history)

Accessed: Sunday Jun 21 14:59:56 2026

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