v.in.db

NAME

v.in.db

DESCRIPTION

v.in.db creates new vector (points) map from database table containing coordinates.

EXAMPLE

1) 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 pg driver page for detail.

2) 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 pg driver page for detail.

3) Import of a points table (x, y, z) from DBF file to vector points map:
#create vector map from DBF table (here, ’idcol’ contains unique row IDs, ’z’ is optional):
#the ’database’ parameter 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
#check result:
v.info dtmpoints
v.info -c dtmpoints

If an ID column is missing in the DBF file, it has to be added beforehand, e.g. with OpenOffice.

4) Import of a points table (x, y, z) from SQLite file to vector points map:
#create vector map from table in SQLITE database file (here, ’idcol’ contains unique row IDs, ’z’ is optional):
#the ’database’ parameter is the the SQLite database file with path:
v.in.db driver=sqlite database=/home/user/tables/mysqlite.db table=pointsfile x=x y=y z=z \
key=idcol out=dtmpoints
#check result:
v.info dtmpoints
v.info -c dtmpoints

If an ID column is missing in the table, it has to be added beforehand with ’sqlite3’ or db.execute.

5) Import of a points table (x, y, z) from DBF file to vector points map for selected points 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"

SEE ALSO

db.execute, v.info, v.in.ogr, v.to.db,
SQL support in GRASS GIS

AUTHOR

Radim Blazek

Last changed: $Date: 2007/07/16 09:49:30 $

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