NAME

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

KEYWORDS

       temporal, contour, raster, vector, time

SYNOPSIS

       t.rast.contour
       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]

   Flags:
       -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

       --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’

       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

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

       Last changed: $Date: 2015-09-05 18:13:18 +0200 (Sat, 05 Sep 2015) $

SOURCE CODE

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

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       © 2003-2018 GRASS Development Team, GRASS GIS 7.4.0 Reference Manual