t.rast.to.vect(1grass) GRASS GIS User's Manual t.rast.to.vect(1grass)
NAME
t.rast.to.vect - Converts a space time raster dataset into a space
time vector dataset
KEYWORDS
temporal, conversion, raster, vector, time
SYNOPSIS
t.rast.to.vect
t.rast.to.vect --help
t.rast.to.vect [-ntszbv] input=name output=name [where=sql_query]
type=string basename=string [suffix=string] [column=string]
[nprocs=integer] [--overwrite] [--help] [--verbose] [--quiet]
[--ui]
Flags:
-n
Register empty vector maps
-t
Do not create attribute tables
-s
Smooth corners of area features
-z
Write raster values as z coordinate
Table is not created. Currently supported only for points.
-b
Do not build vector topology
Name must be SQL compliant
-v
Use raster values as categories instead of unique sequence (CELL
only)
--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
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’
type=string [required]
Output feature type
Options: point, line, area
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
column=string
Name of attribute column to store value
Default: value
nprocs=integer
Number of r.to.vect processes to run in parallel, more than 1
process works only in conjunction with flag -t
Default: 1
DESCRIPTION
t.rast.to.vect is designed to convert a space time raster dataset into
a space time vector dataset. This module works as a front-end to
r.to.vect and therefore supports all parameter of this module. Hence,
all raster map layers in a space time raster dataset are passed to
r.to.vect that converts them into vector map layers (using point,line
or area as conversion criteria). Please refer to the r.to.vect docu-
mentation for a detailed description of the raster to vector conversion
options. The new generated vector 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.to.vect module in-
stances. 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 lay-
ers should be converted into vector map layers.
SEE ALSO
r.to.vect, t.rast.db.select, t.info
AUTHOR
Sören Gebbert, Geoinformatikbüro Dassau
SOURCE CODE
Available at: t.rast.to.vect source code (history)
Accessed: unknown
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GRASS 7.8.7 t.rast.to.vect(1grass)
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