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 to import 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 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 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 MS Excel file

A new vector point map is created from given list in MS Excel file file. The database option points to the file in MS Excel format. Option table is name of selected spreadsheet list.

v.in.db table=List1 x=long y=lat z=height output=meteodata \
         driver=ogr datatabase=meteodata.xls

Note that 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

AUTHORS

Radim Blazek
Various updates for GRASS 7 by Martin Landa, Czech Technical University in Prague, Czech Republic

Last changed: $Date$