1t.rast.contour(1)           GRASS GIS User's Manual          t.rast.contour(1)
2
3
4

NAME

6       t.rast.contour   -  Produces  a  space time vector dataset of specified
7       contours from a space time raster dataset.
8

KEYWORDS

10       temporal, contour, raster, vector, time
11

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
24
25       -t
26           Do not create attribute tables
27
28       --overwrite
29           Allow output files to overwrite existing files
30
31       --help
32           Print usage summary
33
34       --verbose
35           Verbose module output
36
37       --quiet
38           Quiet module output
39
40       --ui
41           Force launching GUI dialog
42
43   Parameters:
44       input=name [required]
45           Name of the input space time raster dataset
46
47       output=name [required]
48           Name of the output space time vector dataset
49
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’
54
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
59
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
65
66       step=float
67           Increment between contour levels
68
69       levels=float[,float,...]
70           List of contour levels
71
72       minlevel=float
73           Minimum contour level
74
75       maxlevel=float
76           Maximum contour level
77
78       cut=integer
79           Minimum number of points for a contour line (0 -> no limit)
80           Default: 0
81
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
86

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.
97
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.
106
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.
111

SEE ALSO

113        r.contour, t.rast.db.select, t.info
114

AUTHOR

116       Sören Gebbert, Geoinformatikbüro Dassau
117

SOURCE CODE

119       Available at: t.rast.contour source code (history)
120
121       Accessed: Saturday Jan 21 21:17:05 2023
122
123       Main index | Temporal index | Topics index | Keywords index | Graphical
124       index | Full index
125
126       © 2003-2023 GRASS Development Team, GRASS GIS 8.2.1 Reference Manual
127
128
129
130GRASS 8.2.1                                                  t.rast.contour(1)