Extracting coordinates of points and writing them to the attribute table

The workflow below describes how coordinates can be extracted from points and how they can be written into the attribute table.

The example is based on a CSV-File:

674065.18600,3367985.59300,25.83
674066.43200,3367982.46800,25.96
674065.99100,3367983.83600,40.24
674065.92600,3367985.70100,26.00

''' '''

Import points

For the import of the CSV-File use v.in.ascii.

v.in.ascii -z input=/path/to/points_map.csv output=points format=point skip=0 x=1 y=2 z=3 cat=0 fs=,

Add attribute table for vector

Through v.db.addtable an attribute table for the points is created.

v.db.addtable map=points_map table=points_map columns="cat integer"

Connect the vector to the attribute table

Use v.db.connect to connect the vector with its corresponding table.

v.db.connect -o map=points_map table=points_map

Add columns

Use v.db.addcol to add the columns to the attribute table.

v.db.addcol map=points columns="x double precision, y double precision, z double precision"

Add coordinates

Use v.to.db to write the coordinates of the points into the attribute table.

v.to.db map=points_map opt=coor columns="x,y,z"

--TimNorwey 14:01, 26 March 2011 (PDT)