v.in.db - Create new vector (points) from database table containing coordinates.

v.in.db

v.in.db help

v.in.db driver=string database=string table=string x=string y=string [z=string] key=string output=string

Parameters:

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

1) Creating a map from PostgreSQL table:

v.in.db driver=pg database="host=myserver.itc.it,dbname=mydb,user=name"

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, the 'object ID' of PostgreSQL can be used. In this case set:

cat=OID

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,user=name"

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, the 'object ID' of PostgreSQL can be used. In this case set:

cat=OID

3) Import of a points table (x, y, z) from DBF file to vector points map:

The DBF file has to be copied into $MAPSET/dbf/ (to be created if not existing yet). Then the DBMI needs to be connected to this directory:

#check current DB settings:

db.connect -p

#only needed, if not already defined:

db.connect driver=dbf database='$GISDBASE/$LOCATION_NAME/$MAPSET/dbf/'

#create dbf/ directory if not yet existing:

mkdir g.gisenv get=GISDBASE/g.gisenv get=LOCATION_NAME/g.gisenv get=MAPSET/dbf



#copy DBF table to this directory:

cp pointsfile.dbf g.gisenv get=GISDBASE/g.gisenv get=LOCATION_NAME/g.gisenv get=MAPSET/dbf/

#verify table columns

db.tables -p

db.describe -c pointsfile

#create vector map from DBF table ('idcol' is containing unique row IDs, z is optional):

v.in.db driver=dbf 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, such a column with unique IDs has to be added beforehand.

Radim Blazek

Last changed: $Date: 2005/08/08 16:26:04 $

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