.TH t.vect.extract 1grass "" "GRASS 7.8.5" "GRASS GIS User's Manual"
.SH NAME
\fI\fBt.vect.extract\fR\fR  \- Extracts a subset of a space time vector dataset.
.SH KEYWORDS
temporal, extract, vector, time
.SH SYNOPSIS
\fBt.vect.extract\fR
.br
\fBt.vect.extract \-\-help\fR
.br
\fBt.vect.extract\fR [\-\fBn\fR] \fBinput\fR=\fIname\fR  [\fBwhere\fR=\fIsql_query\fR]   [\fBexpression\fR=\fIsql_query\fR]  \fBoutput\fR=\fIname\fR  [\fBlayer\fR=\fIstring\fR]   [\fBtype\fR=\fIstring\fR[,\fIstring\fR,...]]   [\fBbasename\fR=\fIstring\fR]   [\fBsuffix\fR=\fIstring\fR]   [\fBnprocs\fR=\fIinteger\fR]   [\-\-\fBoverwrite\fR]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-n\fR" 4m
.br
Register empty maps
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBinput\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of the input space time vector dataset
.IP "\fBwhere\fR=\fIsql_query\fR" 4m
.br
WHERE conditions of SQL statement without \(cqwhere\(cq keyword used in the temporal GIS framework
.br
Example: start_time > \(cq2001\-01\-01 12:30:00\(cq
.IP "\fBexpression\fR=\fIsql_query\fR" 4m
.br
WHERE conditions of SQL statement without \(cqwhere\(cq keyword
.br
Example: income < 1000 and population >= 10000
.IP "\fBoutput\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of the output space time vector dataset
.IP "\fBlayer\fR=\fIstring\fR" 4m
.br
Layer number or name
.br
Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
.br
Default: \fI1\fR
.IP "\fBtype\fR=\fIstring[,\fIstring\fR,...]\fR" 4m
.br
Input feature type
.br
Options: \fIpoint, line, boundary, centroid, area\fR
.br
Default: \fIpoint,line,boundary,centroid,area\fR
.IP "\fBbasename\fR=\fIstring\fR" 4m
.br
Basename of the new generated output maps
.br
A numerical suffix separated by an underscore will be attached to create a unique identifier
.IP "\fBsuffix\fR=\fIstring\fR" 4m
.br
Suffix to add at basename: set \(cqgran\(cq for granularity, \(cqtime\(cq for the full time format, \(cqnum\(cq for numerical suffix with a specific number of digits (default %05)
.br
Default: \fIgran\fR
.IP "\fBnprocs\fR=\fIinteger\fR" 4m
.br
The number of v.extract processes to run in parallel. Use only if database backend is used which supports concurrent writing
.br
Default: \fI1\fR
.SH DESCRIPTION
The purpose of \fBt.vect.extract\fR is to extract a subset of a space
time vector dataset and to store that subset in a different space time
vector dataset.
.SH EXAMPLE
In the following example a new space time vector dataset will be create
with all the data later than 2000:
.br
.nf
\fC
t.vect.extract input=shoreline where=\(dqstart_time > 2000\(dq \(rs
               output=shoreline_later_2000 basename=new_shoreline
t.info shoreline_later_2000@shoreline type=stvds
 +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Space Time Vector Dataset \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+
 |                                                                            |
 +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Basic information \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+
 | Id: ........................ shoreline_later_2000@shoreline
 | Name: ...................... shoreline_later_2000
 | Mapset: .................... shoreline
 | Creator: ................... lucadelu
 | Temporal type: ............. relative
 | Creation time: ............. 2014\-11\-29 08:43:50.043219
 | Modification time:.......... 2014\-11\-29 08:43:50.085407
 | Semantic type:.............. mean
 +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Relative time \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+
 | Start time:................. 2003
 | End time:................... 2009
 | Relative time unit:......... years
 | Granularity:................ 1
 | Temporal type of maps:...... point
 +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Spatial extent \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+
 | North:...................... 1039175.31479
 | South:...................... 34705.216018
 | East:.. .................... 3052322.44671
 | West:....................... 2130004.16779
 | Top:........................ 0.0
 | Bottom:..................... 0.0
 +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- Metadata information \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+
 | Vector register table:...... vector_map_register_8395740fc8de42149fef74a3d25bbb05
 | Number of points ........... 0
 | Number of lines ............ 407
 | Number of boundaries ....... 0
 | Number of centroids ........ 0
 | Number of faces ............ 0
 | Number of kernels .......... 0
 | Number of primitives ....... 407
 | Number of nodes ............ 767
 | Number of areas ............ 0
 | Number of islands .......... 0
 | Number of holes ............ 0
 | Number of volumes .......... 0
 | Number of registered maps:.. 3
 |
 | Title:
 | North Carolina shoreline
 | Description:
 | North Caroline shoreline from 2000 to 2009
 | Command history:
 | # 2014\-11\-29 08:43:50
 | t.vect.extract input=\(dqshoreline\(dq
 |     where=\(dqstart_time > 2000\(dq output=\(dqshoreline_later_2000\(dq
 |     basename=\(dqnew_shoreline\(dq
 | # 2014\-11\-29 08:44:14
 | t.support type=\(dqstvds\(dq
 |     input=\(dqshoreline_later_2000@shoreline\(dq
 |     descr=\(dqNorth Caroline shoreline from 2000 to 2009\(dq
 +\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+
t.vect.list shoreline_later_2000
name|layer|mapset|start_time|end_time
shoreline_2003|None|shoreline|2003|None
shoreline_2004|None|shoreline|2004|None
shoreline_2009|None|shoreline|2009|None
\fR
.fi
.SH SEE ALSO
\fI
t.create,
t.info
\fR
.SH AUTHOR
Sören Gebbert, Thünen Institute of Climate\-Smart Agriculture
.SH SOURCE CODE
.PP
Available at: t.vect.extract source code (history)
.PP
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.PP
© 2003\-2020
GRASS Development Team,
GRASS GIS 7.8.5 Reference Manual