1t.rast.to.vect(1) GRASS GIS User's Manual t.rast.to.vect(1)
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6 t.rast.to.vect - Converts a space time raster dataset into a space
7 time vector dataset
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10 temporal, conversion, raster, vector, time
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13 t.rast.to.vect
14 t.rast.to.vect --help
15 t.rast.to.vect [-ntszbv] input=name output=name [where=sql_query]
16 type=string basename=string [suffix=string] [column=string]
17 [nprocs=integer] [--overwrite] [--help] [--verbose] [--quiet]
18 [--ui]
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20 Flags:
21 -n
22 Register empty vector maps
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24 -t
25 Do not create attribute tables
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27 -s
28 Smooth corners of area features
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30 -z
31 Write raster values as z coordinate
32 Table is not created. Currently supported only for points.
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34 -b
35 Do not build vector topology
36 Name must be SQL compliant
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38 -v
39 Use raster values as categories instead of unique sequence (CELL
40 only)
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42 --overwrite
43 Allow output files to overwrite existing files
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45 --help
46 Print usage summary
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48 --verbose
49 Verbose module output
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51 --quiet
52 Quiet module output
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54 --ui
55 Force launching GUI dialog
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57 Parameters:
58 input=name [required]
59 Name of the input space time raster dataset
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61 output=name [required]
62 Name of the output space time vector dataset
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64 where=sql_query
65 WHERE conditions of SQL statement without ’where’ keyword used in
66 the temporal GIS framework
67 Example: start_time > ’2001-01-01 12:30:00’
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69 type=string [required]
70 Output feature type
71 Options: point, line, area
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73 basename=string [required]
74 Basename of the new generated output maps
75 A numerical suffix separated by an underscore will be attached to
76 create a unique identifier
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78 suffix=string
79 Suffix to add at basename: set ’gran’ for granularity, ’time’ for
80 the full time format, ’num’ for numerical suffix with a specific
81 number of digits (default %05)
82 Default: gran
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84 column=string
85 Name of attribute column to store value
86 Default: value
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88 nprocs=integer
89 Number of r.to.vect processes to run in parallel, more than 1
90 process works only in conjunction with flag -t
91 Default: 1
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94 t.rast.to.vect is designed to convert a space time raster dataset into
95 a space time vector dataset. This module works as a front-end to
96 r.to.vect and therefore supports all parameter of this module. Hence,
97 all raster map layers in a space time raster dataset are passed to
98 r.to.vect that converts them into vector map layers (using point,line
99 or area as conversion criteria). Please refer to the r.to.vect docu‐
100 mentation for a detailed description of the raster to vector conversion
101 options. The new generated vector map layers will be registered in the
102 output space time vector dataset, using the same time stamps as their
103 raster map layer origins.
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105 This module supports the parallel processing of r.to.vect module
106 instances. The number of parallel processes can be set with the nprocs
107 option. However, this will only work in conjunction with the -t flag,
108 that avoids the creation of attribute tables. The parallel creation of
109 attribute tables is not supported.
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111 The where option allows selecting subsets of the input space time
112 raster dataset.
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114 The flag -n can be used to force the registration of empty vector map
115 layers. Empty vector maps may occur in case that empty raster map lay‐
116 ers should be converted into vector map layers.
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119 r.to.vect, t.rast.db.select, t.info
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122 Sören Gebbert, Geoinformatikbüro Dassau
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125 Available at: t.rast.to.vect source code (history)
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127 Main index | Temporal index | Topics index | Keywords index | Graphical
128 index | Full index
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130 © 2003-2020 GRASS Development Team, GRASS GIS 7.8.5 Reference Manual
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134GRASS 7.8.5 t.rast.to.vect(1)