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t.rast.contour - Produces a space time vector dataset of specified contours from a space time raster dataset.


temporal, contour, raster, vector, time


t.rast.contour --help
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] [--help] [--verbose] [--quiet] [--ui]


Register empty vector maps
Do not create attribute tables
Allow output files to overwrite existing files
Print usage summary
Verbose module output
Quiet module output
Force launching GUI dialog


input=name [required]
Name of the input space time raster dataset
output=name [required]
Name of the output space time vector dataset
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 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
Increment between contour levels
List of contour levels
Minimum contour level
Maximum contour level
Minimum number of points for a contour line (0 -> no limit)
Default: 0
Number of r.contour processes to run in parallel, more than 1 process works only in conjunction with flag -t
Default: 1

Table of contents


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.




Sören Gebbert, Geoinformatikbüro Dassau


Available at: t.rast.contour source code (history)

Latest change: Thursday Jan 26 14:10:26 2023 in commit: cdd84c130cea04b204479e2efdc75c742efc4843

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