GRASS GIS manual: v.db.join

Note: A new GRASS GIS stable version has been released: GRASS GIS 7.4, available here.
Updated manual page: here

NAME

v.db.join - Joins a database table to a vector map table.

KEYWORDS

vector, attribute table, database

SYNOPSIS

v.db.join

v.db.join --help

v.db.join map=name [layer=string] column=name other_table=name other_column=name [subset_columns=name[,name,...]] [--help] [--verbose] [--quiet] [--ui]

Flags:

--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

map=name [required]: Name of vector map; Vector map to which to join other table
layer=string: Layer number or name; Layer where to join; Default: 1
column=name [required]: Identifier column (e.g.: cat) in the vector table to be used for join
other_table=name [required]: Other table name
other_column=name [required]: Identifier column (e.g.: id) in the other table used for join
subset_columns=name[,name,...]: Subset of columns from the other table

DESCRIPTION
NOTES
EXAMPLES
- Soil map table join
SEE ALSO
AUTHOR

DESCRIPTION

v.db.join joins the content of another table into the connected attribute table of a vector map.

NOTES

v.db.join is a front-end to db.execute to allow easier usage. The vector attribute table must be stored in a SQL database (SQLite, PostgreSQL, MySQL, ODBC, ...). The DBF backend is not supported. Tables can be imported with db.in.ogr.

The vector map-database connection(s) can be verified with v.db.connect.

EXAMPLES

Exercise to join North Carolina geological classes from a CSV table to the "geology" map of the North Carolina sample dataset (requires download of legend CSV file nc_geology.csv from External data for NC sample dataset):

# check original map attributes
v.db.select geology column=GEO_NAME,SHAPE_area

# import of CSV table
db.in.ogr input=nc_geology.csv output=nc_geology

# work on copy of geology map in current mapset
g.copy vector=geology,mygeology

# check column names of vector map attributes
v.info -c mygeology

# check column names of legend table
db.describe -c nc_geology

# join table using key columns (map: "GEO_NAME"; table: "geol_id")
v.db.join map=mygeology column=GEO_NAME other_table=nc_geology other_column=geol_id

# verify result (here abbreviated)
v.db.select mygeology | head -3
cat|onemap_pro|PERIMETER|GEOL250_|GEOL250_ID|GEO_NAME|SHAPE_area|SHAPE_len|geol_id|longname|comment
1|963738.75|4083.97998|2|1|Zml|963738.608571|4083.979839|Zml|Metagraywacke|Interlayered with metaconglomerate, ...
2|22189124|26628.261719|3|2|Zmf|22189123.2296|26628.261112|Zmf|Metafelsite|Light-colored porphyritic extrusive rock
...

Soil map table join

Joining the soil type explanations from table soils_legend into the Spearfish soils map (download legend):

g.copy vect=soils,mysoils

# import legend table
db.in.ogr soils_legend.csv out=soils_legend

# get join column names
v.info -c mysoils
db.describe -c soils_legend

# look at original table
v.db.select mysoils
cat|label
1|Aab
2|Ba
3|Bb
4|BcB
5|BcC
...

# look at legend
db.select table=soils_legend
db.select table=soils_legend | head -7
id|shortname|longname
0|no data|no data
0|AaB|Alice fine sandy loam, 0 to 6
0|Ba|Barnum silt loam
0|Bb|Barnum silt loam, channeled
0|BcB|Boneek silt loam, 2 to 6
0|BcC|Boneek silt loam, 6 to 9
...

# join soils_legend into mysoils attribute table
v.db.join mysoils col=label other_table=soils_legend ocol=shortname

# verification of join
v.db.select mysoils
cat|label|id|shortname|longname
1|Aab|||
2|Ba|2|Ba|Barnum silt loam
3|Bb|3|Bb|Barnum silt loam, channeled
4|BcB|4|BcB|Boneek silt loam, 2 to 6
5|BcC|5|BcC|Boneek silt loam, 6 to 9
...

AUTHOR

Markus Neteler

Last changed: $Date: 2015-12-17 06:41:28 -0800 (Thu, 17 Dec 2015) $

SOURCE CODE

Available at: v.db.join source code (history)