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So when you have identified in your
lines map which lines are closed or not (with the coordinates
equality), you can compute the length of all the lines and remove
the closed ones which are under the threshold you want with
v.extract. You can have two columns in your line map, one which
identify if the line is closed or not and one whith the length.
And you can used the v.extract command with where="coltag="closed"
AND collength<xxx"
Mick Le 06/11/2013 17:23, BLANDENIER Lucien a écrit : In fact I need to remove some of the closed line according to their length.Normally v.clean is able to remove small line with a threshold but it is not working for closed lines... I was wondering if there is an easy way to do this. Or maybe is there a possibility to cut the "closed" lines regards ________________________________ De : Rabotin Michael [[email protected]] Envoyé : mercredi 6 novembre 2013 16:54 À : [email protected] Cc : BLANDENIER Lucien Objet : Re: [GRASS-user] How to remove small closed lines Hi, maybe you can identify your closed lines with v.to.db command and the coordinate of the start point and the end point v.to.db map=mylines option=end type=line col=coordEnd v.to.db map=mylines option=start type=line col=coordStart and tests if the coordinates of the startNode and the EndNode are equals, the line is closed and you can tag your lines . And use after the v.extract command to extract only the lines which are not closed. Hope it can be helpful Michael Le 06/11/2013 16:25, [email protected]<mailto:[email protected]> a écrit : Date: Wed, 6 Nov 2013 12:59:29 +0000 From: BLANDENIER Lucien <[email protected]><mailto:[email protected]> To: "[email protected]"<mailto:[email protected]> <[email protected]><mailto:[email protected]> Subject: [GRASS-user] How to remove small closed lines Message-ID: <[email protected]><mailto:[email protected]> Content-Type: text/plain; charset="iso-8859-1" Hi, I would like to know how to remove automatically small circles (closed lines, not area). I've tried with v.clean and v.generalize but I just get to remove line which are not closed. Regards Lucien -- [INRA]<http://www.inra.fr> Michael Rabotin Ingénieur d'Etude SIG / GIS Engineer [email protected]<mailto:#> UMR LISAH - Centre de Montpellier Tèl. : +33 (0)4 99 61 23 85 Mobile : +33 (0)6 76 45 46 83 Fax : +33 (0)4 67 63 26 14 Bat 24 - 2 place Pierre Viala 34060 Montpellier cedex 2 France www.inra.fr<http://www.inra.fr> www.openfluid-project.org<http://www.openfluid-project.org> --
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