1t.rast.contour(1)           GRASS GIS User's Manual          t.rast.contour(1)
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NAME

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

10       temporal, contour, raster, vector, time
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SYNOPSIS

13       t.rast.contour
14       t.rast.contour --help
15       t.rast.contour [-nt] input=name output=name   [where=sql_query]   base‐
16       name=string         [suffix=string]          [step=float]         [lev‐
17       els=float[,float,...]]   [minlevel=float]   [maxlevel=float]   [cut=in‐
18       teger]     [nprocs=integer]     [--overwrite]    [--help]   [--verbose]
19       [--quiet]  [--ui]
20
21   Flags:
22       -n
23           Register empty vector maps
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25       -t
26           Do not create attribute tables
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28       --overwrite
29           Allow output files to overwrite existing files
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31       --help
32           Print usage summary
33
34       --verbose
35           Verbose module output
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37       --quiet
38           Quiet module output
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40       --ui
41           Force launching GUI dialog
42
43   Parameters:
44       input=name [required]
45           Name of the input space time raster dataset
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47       output=name [required]
48           Name of the output space time vector dataset
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50       where=sql_query
51           WHERE conditions of SQL statement without ’where’ keyword  used  in
52           the temporal GIS framework
53           Example: start_time > ’2001-01-01 12:30:00’
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55       basename=string [required]
56           Basename of the new generated output maps
57           A  numerical  suffix separated by an underscore will be attached to
58           create a unique identifier
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60       suffix=string
61           Suffix to add at basename: set ’gran’ for granularity,  ’time’  for
62           the  full  time  format, ’num’ for numerical suffix with a specific
63           number of digits (default %05)
64           Default: gran
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66       step=float
67           Increment between contour levels
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69       levels=float[,float,...]
70           List of contour levels
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72       minlevel=float
73           Minimum contour level
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75       maxlevel=float
76           Maximum contour level
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78       cut=integer
79           Minimum number of points for a contour line (0 -> no limit)
80           Default: 0
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82       nprocs=integer
83           Number of r.contour processes to  run  in  parallel,  more  than  1
84           process works only in conjunction with flag -t
85           Default: 1
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DESCRIPTION

88       t.rast.contour  is  designed  to produce a space time vector dataset of
89       specified contours from a space time raster dataset. This module  works
90       as  a  front-end  to  r.contour and therefore supports all parameter of
91       this module. Hence, all raster  map  layers  in  a  space  time  raster
92       dataset  are successively passed to r.contour that computes the contour
93       lines.  Please refer to the r.contour documentation for a detailed  de‐
94       scription.   The new generated vector contour map layers will be regis‐
95       tered in the output space time vector  dataset,  using  the  same  time
96       stamps as their raster map layer origins.
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98       This  module  supports  the parallel processing of r.contour module in‐
99       stances. The number of parallel processes can be set  with  the  nprocs
100       option.   However, this will only work in conjunction with the -t flag,
101       that avoids the creation of attribute tables.  The parallel creation of
102       attribute tables is not supported.
103
104       The  where  option  allows  selecting  subsets  of the input space time
105       raster dataset.
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107       The flag -n can be used to force the registration of empty  vector  map
108       layers.  Empty vector maps may occur in case that empty raster map lay‐
109       ers should be converted into vector map layers, or in case  the  chosen
110       steps or contour levels are not present in the raster map layers.
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SEE ALSO

113        r.contour, t.rast.db.select, t.info
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AUTHOR

116       Sören Gebbert, Geoinformatikbüro Dassau
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SOURCE CODE

119       Available at: t.rast.contour source code (history)
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121       Accessed: Mon Jun 20 16:47:47 2022
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123       Main index | Temporal index | Topics index | Keywords index | Graphical
124       index | Full index
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126       © 2003-2022 GRASS Development Team, GRASS GIS 8.2.0 Reference Manual
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130GRASS 8.2.0                                                  t.rast.contour(1)