t.vect.what.strds.1grass man page

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 inhab >= 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

Last changed: $Date: 2016-10-27 23:24:04 +0200 (Thu, 27 Oct 2016) $

Source Code

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

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© 2003-2017 GRASS Development Team, GRASS GIS 7.2.1 Reference Manual

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