[GRASS-user] Update of vector table through selections in the map

[Jonathan Aguero]

First thanks to Dylan Beaudette, Andreas Philipp, and Michael Barton for
their answers but I guess I didn't explain myself clearly, maybe some more
detail can help.
I have a point map representing the intersections on centerline roads
segments derived from the roads segment map (lines) through a several step
process. Some of this intersections represent at-grade road intersections
such as stop controlled intersections or signalized intersections while some
others represent the on and off ramps in an interchange. I need to classify
the elements in these two categories, intersections and interchanges. The
only way to really distinguish between these two types is by visual
inspection of the segments map and corresponding intersections map. So I was
looking for a way of selecting several points though out the mouse click on
the screen and then assigning a value of the attribute for all the selected
points at the same time. This cannot be accomplished by database commands
like v.db.update or update/where.

Jonathan Aguero Valverde

-----Original Message-----
From: Michael Barton [mailto:Michael.Barton at asu.edu] 
Sent: Tuesday, June 06, 2006 12:31 AM
To: Jonathan Aguero; grassuser at grass.itc.it
Subject: Re: [GRASS-user] Update of vector table through selections in the
map

Use v.db.update (in the database menu)

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton




From: Jonathan Aguero <jua130 at psu.edu>
Date: Mon, 5 Jun 2006 17:11:37 -0400
To: <grassuser at grass.itc.it>
Subject: [GRASS-user] Update of vector table through selections in the map

Dear List,
I am trying to update the value of several records in a vector table
simultaneously. The elements to be updated need to be selected in the map. I
know you can update the values one by one with v.digit or using qgis/GRASS
but I want to update several each time, something like the ³calculate
values² in the table using ARC-GIS.
PD: I am using pgsql for the tables.
Any idea is welcome, thanks!
 
Jonathan Aguero Valverde
Research Assistant and Ph.D. Candidate
Pennsylvania State University
The Pennsylvania Transportation Institute
201 Transportation Research Building
University Park, PA 16802
www.personal.psu.edu/jua130