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

SOURCE CODE

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

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