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

6       t.rast.to.vect   -  Converts  a  space time raster dataset into a space
7       time vector dataset
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KEYWORDS

10       temporal, conversion, raster, vector, time
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SYNOPSIS

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]
19
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
47
48       --verbose
49           Verbose module output
50
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
87
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
92

DESCRIPTION

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.
104
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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SEE ALSO

119        r.to.vect, t.rast.db.select, t.info
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AUTHOR

122       Sören Gebbert, Geoinformatikbüro Dassau
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SOURCE CODE

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)
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