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t.vect.db.select(1grass) GRASS GIS User's Manual t.vect.db.select(1grass)

NAME

t.vect.db.select - Prints attributes of vector maps registered in a space time vector dataset.

KEYWORDS

temporal, attribute table, vector, database, select, time

SYNOPSIS

t.vect.db.select
t.vect.db.select --help
t.vect.db.select input=name [columns=name[,name,...]] [separator=character] [layer=string] [where=sql_query] [t_where=sql_query] [--help] [--verbose] [--quiet] [--ui]

Flags:


Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

Parameters:


Name of the input space time vector dataset

Name of attribute column(s)

Field separator character between the output columns
Special characters: pipe, comma, space, tab, newline
Default: pipe

Layer number or name
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.
Default: 1

WHERE conditions of SQL statement without ’where’ keyword
Example: income < 1000 and population >= 10000

WHERE conditions of SQL statement without ’where’ keyword used in the temporal GIS framework
Example: start_time > ’2001-01-01 12:30:00’

DESCRIPTION

The module t.vect.db.select prints attributes of vector maps registered in a space time vector dataset.

EXAMPLE

The example is querying the shoreline space time dataset: 

t.vect.db.select input=shoreline
start_time|end_time|cat|DESCR|SOURCE|DATE
1849|1873|1|T-736|NOAA/USGS|01/01/1858
1849|1873|2|T-657|NOAA/USGS|01/01/1857
1849|1873|3|T-381(2)|NOAA/USGS|01/01/1852
1849|1873|4|T-381(1)|NOAA/USGS|01/01/1852
1849|1873|5|T-381(1)|NOAA/USGS|01/01/1852
...
2009||44|2009 USDA NAIP|2009-07-11|VA, SAND, Wet / Dry
2009||45|2009 USDA NAIP|2009-07-11|Carolina Beach, SAND, Wet / Dry
2009||46|2009 USDA NAIP|2009-07-11|Carolina Beach, REVETMENT-ROCK, Hard Structure
2009||47|2009 USDA NAIP|2009-07-11|Fort Fisher, REVETMENT-ROCK, Hard Structure

In the following example it print only DATE and SOURCE columns for data before 1900-01-01. 

t.vect.db.select input=shoreline column=DATE,SOURCE t_where="start_time < 1900"
start_time|end_time|DATE|SOURCE
1849|1873|01/01/1858|NOAA/USGS
1849|1873|01/01/1857|NOAA/USGS
1849|1873|01/01/1852|NOAA/USGS
1849|1873|01/01/1852|NOAA/USGS
...
1849|1873|01/01/1860|NOAA/USGS
1849|1873|01/01/1860|NOAA/USGS
1849|1873|01/01/1873|Coastal Carolina University
1849|1873|01/01/1873|Coastal Carolina University
1849|1873|01/01/1873|Coastal Carolina University

SEE ALSO

t.create, t.info

AUTHOR

Sören Gebbert, Thünen Institute of Climate-Smart Agriculture

SOURCE CODE

Available at: t.vect.db.select source code (history)

Accessed: Wednesday Feb 12 05:32:38 2025

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GRASS 8.4.1RC1