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
       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.

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)

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual