table of contents
v.in.db(1grass) | GRASS GIS User's Manual | v.in.db(1grass) |
NAME¶
v.in.db - Creates new vector (points) map from database table containing coordinates.
KEYWORDS¶
vector, import, database, points
SYNOPSIS¶
v.in.db
v.in.db --help
v.in.db [-t] table=name
[driver=name] [database=name]
x=name y=name [z=name]
[key=name] [where=sql_query]
output=name [--overwrite] [--help]
[--verbose] [--quiet] [--ui]
Flags:¶
Parameters:¶
- table=name [required]
-
Input table name - driver=name
-
Name of database driver
Options: dbf, mysql, odbc, ogr, pg, sqlite
Default: sqlite - database=name
-
Name of database
Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db - x=name [required]
-
Name of column containing x coordinate - y=name [required]
-
Name of column containing y coordinate - z=name
-
Name of column containing z coordinate - key=name
-
Name of column containing category number
Must refer to an integer column - where=sql_query
-
WHERE conditions of SQL statement without ’where’ keyword
Example: income < 1000 and population >= 10000 - output=name [required]
-
Name for output vector map
DESCRIPTION¶
v.in.db creates a new vector point map from database table or file containing coordinates.
NOTES¶
If GRASS comes with OGR support than v.in.db allows importing data from different input files, eg. CSV or MS Excel (assuming that GDAL/OGR library is compiled with this support).
v.in.db creates key column "cat" automatically when key option is not given. Note that this operation is possible to perform only when -t flag is not given. Currently, automated creation of key column is supported only when default DB driver for output vector map is SQLite driver otherwise key option must be specified by the user. Default DB driver is defined by db.connect.
EXAMPLES¶
Creating a map from PostgreSQL table¶
v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb" \
table=pat_stazioni x=east y=north z=quota key=id output=pat_stazioni
If an ID column is not present in the PostgreSQL table, a new column should be added. See PostgreSQL DB driver page for details.
Creating a map from PostGIS¶
To extract coordinate values from PostGIS, functions have to be
used:
v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb" \
table=station x="x(geom)" y="y(geom)" z="z(geom)" key=id out=meteostations
If an ID column is not present in the PostgreSQL table, a new column should be added. See PostgreSQL DB driver page for details.
Alternatively a vector point map can be imported from PostGIS database using v.in.ogr.
Creating a map from Open Document spreadsheet (ODS) file¶
A new vector point map is created from given sheet in ODS file.
The database option points to the ODS file. Option table is
the name of selected spreadsheet list, the key option is the
identifier column:
# preview table structure with OGR tool (table name is "Layer name" here): ogrinfo -al -so meteodata.ods # import sheet from ODS into map v.in.db key=ID table=mysheet x=long y=lat z=height output=meteodata \
driver=ogr database=meteodata.ods
Creating a map from MS Excel file¶
A new vector point map is created from given sheet in MS Excel
file. The database option points to the file in MS Excel format.
Option table is name of the selected spreadsheet "List1":
v.in.db table=List1 x=long y=lat z=height output=meteodata \
driver=ogr database=meteodata.xls
Note that in this example the key option is omitted. In this case v.in.db tries to add key column automatically. This requires SQLite to be a default DB driver.
Creating a map from DBF table¶
A new 3D point vector map is created from DBF table. Column
’idcol’ contains unique row IDs. The database option is
the directory where the DBF file is stored.
v.in.db driver=dbf database=/home/user/tables/ table=pointsfile x=x y=y z=z \
key=idcol out=dtmpoints
To check result:
v.info dtmpoints v.info -c dtmpoints
If DB driver for output vector map is different from SQLite driver and an ID column is missing in the DBF file, it has to be added beforehand, e.g. with OpenOffice. Alternatively, import the table with db.in.ogr into GRASS and then with v.in.db from the imported table (db.in.ogr optionally adds an unique ID column).
Creating a point map from DBF table for selected records only¶
The user can import only selected vector points from a table using
the where parameter (see above for general DBF handling):
v.in.db driver=dbf database=/home/user/tables/ table=pointsfile x=x y=y z=z \
key=idcol out=dtmpoints where="x NOT NULL and z > 100"
Creating a map from SQLite table¶
A new vector point map is created from table in SQLite database
file. Column ’idcol’ contains unique row IDs. The
database option is the the SQLite database file.
v.in.db driver=sqlite database=/home/user/tables/mysqlite.db table=pointsfile x=x y=y z=z \
key=idcol out=dtmpoints
SEE ALSO¶
db.execute, db.in.ogr, v.info, v.in.geonames, v.in.ogr, v.to.db
SQL support in GRASS GIS
AUTHORS¶
Radim Blazek
Various updates for GRASS 7 by Martin Landa, Czech Technical University in
Prague, Czech Republic
SOURCE CODE¶
Available at: v.in.db source code (history)
Accessed: Sunday Jan 22 07:37:01 2023
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