t.rast.contour
Produces a space time vector dataset of specified contours from a space time raster dataset.
t.rast.contour [-nt] input=name output=name [where=sql_query] basename=string [suffix=string] [step=float] [levels=float [,float,...]] [minlevel=float] [maxlevel=float] [cut=integer] [nprocs=integer] [--overwrite] [--verbose] [--quiet] [--qq] [--ui]
Example:
t.rast.contour input=name output=name basename=string
grass.script.run_command("t.rast.contour", input, output, where=None, basename, suffix="gran", step=None, levels=None, minlevel=None, maxlevel=None, cut=0, nprocs=1, flags=None, overwrite=False, verbose=False, quiet=False, superquiet=False)
Example:
gs.run_command("t.rast.contour", input="name", output="name", basename="string")
Parameters
input=name [required]
Name of the input space time raster dataset
output=name [required]
Name of the output space time vector 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'
basename=string [required]
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
step=float
Increment between contour levels
levels=float [,float,...]
List of contour levels
minlevel=float
Minimum contour level
maxlevel=float
Maximum contour level
cut=integer
Minimum number of points for a contour line (0 -> no limit)
Default: 0
nprocs=integer
Number of r.contour processes to run in parallel, more than 1 process works only in conjunction with flag -t
Default: 1
-n
Register empty vector maps
-t
Do not create attribute tables
--overwrite
Allow output files to overwrite existing files
--help
Print usage summary
--verbose
Verbose module output
--quiet
Quiet module output
--qq
Very quiet module output
--ui
Force launching GUI dialog
input : str, required
Name of the input space time raster dataset
Used as: input, strds, name
output : str, required
Name of the output space time vector dataset
Used as: output, stvds, name
where : str, optional
WHERE conditions of SQL statement without 'where' keyword used in the temporal GIS framework
Example: start_time > '2001-01-01 12:30:00'
Used as: sql_query
basename : str, required
Basename of the new generated output maps
A numerical suffix separated by an underscore will be attached to create a unique identifier
suffix : str, optional
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
step : float, optional
Increment between contour levels
levels : float | list[float] | str, optional
List of contour levels
minlevel : float, optional
Minimum contour level
maxlevel : float, optional
Maximum contour level
cut : int, optional
Minimum number of points for a contour line (0 -> no limit)
Default: 0
nprocs : int, optional
Number of r.contour processes to run in parallel, more than 1 process works only in conjunction with flag -t
Default: 1
flags : str, optional
Allowed values: n, t
n
Register empty vector maps
t
Do not create attribute tables
overwrite: bool, optional
Allow output files to overwrite existing files
Default: False
verbose: bool, optional
Verbose module output
Default: False
quiet: bool, optional
Quiet module output
Default: False
superquiet: bool, optional
Very quiet module output
Default: False
DESCRIPTION
t.rast.contour is designed to produce a space time vector dataset of specified contours from a space time raster dataset. This module works as a front-end to r.contour and therefore supports all parameter of this module. Hence, all raster map layers in a space time raster dataset are successively passed to r.contour that computes the contour lines. Please refer to the r.contour documentation for a detailed description. The new generated vector contour map layers will be registered in the output space time vector dataset, using the same time stamps as their raster map layer origins.
This module supports the parallel processing of r.contour module instances. The number of parallel processes can be set with the nprocs option. However, this will only work in conjunction with the -t flag, that avoids the creation of attribute tables. The parallel creation of attribute tables is not supported.
The where option allows selecting subsets of the input space time raster dataset.
The flag -n can be used to force the registration of empty vector map layers. Empty vector maps may occur in case that empty raster map layers should be converted into vector map layers, or in case the chosen steps or contour levels are not present in the raster map layers.
SEE ALSO
r.contour, t.rast.db.select, t.info
AUTHOR
Sören Gebbert, Geoinformatikbüro Dassau
SOURCE CODE
Available at: t.rast.contour source code
(history)
Latest change: Saturday Mar 01 11:59:08 2025 in commit d310a3c