Nicolas,
To and From have to be different maps - so you need to make a copy using
g.copy.
You can then use the v.distance "all" feature - the -a flag - to create
a database table containing a distance matrix containing all possible
combinations of distances.
Richard Chirgwin
grass-user-requ...@lists.osgeo.org wrote:
Send grass-user mailing list submissions to
grass-user@lists.osgeo.org
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.osgeo.org/mailman/listinfo/grass-user
or, via email, send a message with subject or body 'help' to
grass-user-requ...@lists.osgeo.org
You can reach the person managing the list at
grass-user-ow...@lists.osgeo.org
When replying, please edit your Subject line so it is more specific
than "Re: Contents of grass-user digest..."
Today's Topics:
1. Re: Using v.distance between two identical layers...
(Nicolas DEVAUX)
----------------------------------------------------------------------
Message: 1
Date: Thu, 03 Jun 2010 15:52:00 +0200
From: Nicolas DEVAUX <dev...@supagro.inra.fr>
Subject: Re: [GRASS-user] Using v.distance between two identical
layers...
To: Hamish <hamis...@yahoo.com>
Cc: grass-user@lists.osgeo.org
Message-ID: <4c07b380.2080...@supagro.inra.fr>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Hamish a écrit :
devaux wrote:
do you know if it's possible to use v.distance command when
"for" and "to" layers are
the same layer ?
I have a layer describing ecological areas of interest and
I want to qualify spatial
relation between all patches. I want to identify and
calculate shortest relation between
all my patches boundaries.
How can I do as v.distance command doesn't have any option
like : eliminate identical
objects from the "from" and "to" layer ?
I'd like to use this particular command because of the
option that create lines between
nearest objects.
use g.copy or v.extract as a first step to separate/duplicate the
features?
Hamish
g.copy will duplicate features, but will not avoid v.distance to search
distance between "from" layer feature to all features except itself in
the "to" layer. Or do you mean to do a script that isolate iteratively
each feature from the cover time by time (it might be very long as I
have a lot of features...) and use v.distance as many time as features
number ?
Nicolas
_______________________________________________
grass-user mailing list
grass-user@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/grass-user
