t.rast.to.vect - Converts a space time raster dataset into a space time vector dataset
temporal, conversion, raster, vector, time
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
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 documentation 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 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.
r.to.vect, t.rast.db.select, t.info
Sren Gebbert, Geoinformatikbro Dassau Last changed: $Date: 2015-09-05 18:13:18 +0200 (Sat, 05 Sep 2015) $
Available at: t.rast.to.vect source code (history) Main index | Temporal index | Topics index | Keywords index | Graphical index | Full index 2003-2016 GRASS Development Team, GRASS GIS 7.2.0 Reference Manual
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