t.vect.what.strds.1grass - Man Page

Stores raster map values at spatial and temporal positions of vector points as vector attributes.

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=nameÂ [required]: Name of the input space time vector dataset
strds=nameÂ [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=stringÂ [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