1t.rast.contour(1) Grass User's Manual t.rast.contour(1)
2
6 t.rast.contour - Produces a space time vector dataset of specified
7 contours from a space time raster dataset.
8
10 temporal, contour, raster, vector, time
11
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]
18 [cut=integer] [nprocs=integer] [--overwrite] [--help] [--verbose]
19 [--quiet] [--ui]
20 Flags:
22 -n
23 Register empty vector maps
24 -t
26 Do not create attribute tables
27 --overwrite
29 Allow output files to overwrite existing files
30 --help
32 Print usage summary
33 --verbose
35 Verbose module output
36 --quiet
38 Quiet module output
39 --ui
41 Force launching GUI dialog
42 Parameters:
44 input=name [required]
45 Name of the input space time raster dataset
46 output=name [required]
48 Name of the output space time vector dataset
49 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 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 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 step=float
67 Increment between contour levels
68 levels=float[,float,...]
70 List of contour levels
71 minlevel=float
73 Minimum contour level
74 maxlevel=float
76 Maximum contour level
77 cut=integer
79 Minimum number of points for a contour line (0 -> no limit)
80 Default: 0
81 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
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
94 description. The new generated vector contour map layers will be reg‐
95 istered in the output space time vector dataset, using the same time
96 stamps as their raster map layer origins.
97 This module supports the parallel processing of r.contour module
99 instances. 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 The where option allows selecting subsets of the input space time
105 raster dataset.
106 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
113 r.contour, t.rast.db.select, t.info
114
116 Sören Gebbert, Geoinformatikbüro Dassau
117 Last changed: $Date: 2015-09-05 18:13:18 +0200 (Sat, 05 Sep 2015) $
119
121 Available at: t.rast.contour source code (history)
122 Main index | Temporal index | Topics index | Keywords index | Graphical
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125 © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
127GRASS 7.4.4 t.rast.contour(1)