NAME
t.rast.extract - Extracts a subset of a space time raster datasets.
KEYWORDS
temporal,
extract,
raster,
time
SYNOPSIS
t.rast.extract
t.rast.extract --help
t.rast.extract [-n] input=name [where=sql_query] [expression=string] output=name [basename=string] [suffix=string] [nprocs=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -n
- Register Null maps
- --overwrite
- Allow output files to overwrite existing files
- --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 raster dataset
- 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'
- expression=string
- r.mapcalc expression assigned to all extracted raster maps
- output=name [required]
- Name of the output space time raster dataset
- basename=string
- Basename of the new generated output maps
- A numerical suffix separated by an underscore will be attached to create a unique identifier
- suffix=string
- Suffix to add at basename: set 'gran' for granularity, 'time' for the full time format, 'num' for numerical suffix with a specific number of digits (default %05)
- Default: gran
- nprocs=integer
- Number of r.mapcalc processes to run in parallel
- Default: 1
The purpose of
t.rast.extract is to extract a subset of a space
time raster dataset and to store that subset in a different space time
raster dataset. The
where condition is used to select the
subset. In addition a
r.mapcalc sub-expression can be
specified that performs operations on all maps of the selected subset.
In this expression the name of the input space time raster dataset can
be used as simple map name. Other STRDS than the input STRDS can not be
specified, but any raster map. In case a
r.mapcalc
sub-expression is defined, the base name of the resulting raster maps
must be specified. The
r.mapcalc expression can be used to
select maps as well, since by default resulting empty maps are not
registered in the output space time raster dataset and removed after
processing. The number of parallel GRASS GIS processes can be specified
to speed up the processing.
If no r.mapcalc expression is defined, the selected maps are
simply registered in the new created output space time raster dataset
to avoid data duplication.
The
r.mapcalc sub-expression should not contain the left side
"map =" of a full
r.mapcalc expression, only the right
side, eg.:
t.rast.extract input=tempmean_monthly where="start_time > '2010-01-05'" output=selected_tempmean_monthly basename=new_tmean_month expression="if(tempmean_monthly < 0, null(), tempmean_monthly)"
t.rast.extract input=tempmean_monthly output=tempmean_monthly_later_2012 where="start_time >= '2012-01-01'"
t.rast.list tempmean_monthly_later_2012
name|mapset|start_time|end_time
2012_01_tempmean|climate_2000_2012|2012-01-01 00:00:00|2012-02-01 00:00:00
2012_02_tempmean|climate_2000_2012|2012-02-01 00:00:00|2012-03-01 00:00:00
2012_03_tempmean|climate_2000_2012|2012-03-01 00:00:00|2012-04-01 00:00:00
2012_04_tempmean|climate_2000_2012|2012-04-01 00:00:00|2012-05-01 00:00:00
2012_05_tempmean|climate_2000_2012|2012-05-01 00:00:00|2012-06-01 00:00:00
2012_06_tempmean|climate_2000_2012|2012-06-01 00:00:00|2012-07-01 00:00:00
2012_07_tempmean|climate_2000_2012|2012-07-01 00:00:00|2012-08-01 00:00:00
2012_08_tempmean|climate_2000_2012|2012-08-01 00:00:00|2012-09-01 00:00:00
2012_09_tempmean|climate_2000_2012|2012-09-01 00:00:00|2012-10-01 00:00:00
2012_10_tempmean|climate_2000_2012|2012-10-01 00:00:00|2012-11-01 00:00:00
2012_11_tempmean|climate_2000_2012|2012-11-01 00:00:00|2012-12-01 00:00:00
2012_12_tempmean|climate_2000_2012|2012-12-01 00:00:00|2013-01-01 00:00:00
t.create,
t.info
Sören Gebbert, Thünen Institute of Climate-Smart Agriculture
SOURCE CODE
Available at:
t.rast.extract source code
(history)
Latest change: Wednesday Nov 27 22:53:26 2024 in commit: b90ce69e88409469369ec1edb86fde8ec822af8b
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GRASS Development Team,
GRASS GIS 8.4.1dev Reference Manual