[GRASS-user] v.select error: point array must contain 0 or >1 elements

[Thayer Young]

There is no reason for me not to use 7, I will give it a try.  I thought 6 might be more stable so I started with that.
-Thayer

      From: Markus Neteler <neteler at osgeo.org>
 To: Thayer Young <thayeray at yahoo.com> 
Cc: GRASS LIST <grass-user at lists.osgeo.org> 
 Sent: Sunday, January 18, 2015 5:23 PM
 Subject: Re: [GRASS-user] v.select error: point array must contain 0 or >1 elements
   
On Sat, Jan 17, 2015 at 10:12 PM, Thayer Young <thayeray at yahoo.com> wrote:


>
> I have two shapefiles that I imported into GRASS 6.4.5 using v.in.ogr.  One is a polygon file of building footprints.  The second is a polyline of the pavement edges of urban streets.  I am trying to convert this into street area.  I used v.clean, v.type (to switch from line to boundaries), and v.centroids.  This conversion process gives me street areas but also creates doughnut holes corresponding to the area inside of a city block outlined by the streets.  For the most part the doughnut holes contain buildings, so I am trying to use v.select to select the areas that do not contain buildings.  I have not been able to get anything besides "overlap" to work.  Overlap is not good enough though because many of the buildings have shared nodes with the streets, for example where a driveway runs along one side of a house.  I checked and my version of GRASS was compiled with the following GEOS details:
>    --with-geos=/Library/Frameworks/GEOS.framework/Versions/3/unix/bin/geos-config
>
> Below is an example of an error that I am getting when I try anything besides overlap:
>
> v.select --overwrite ainput=EdgePav_cent at PERMANENT binput=Bldg at PERMANENT output=Pav_sel operator=contains
> WARNING: Vector map <Pav_sel> already exists and will be overwritten
> Building spatial index...
> Processing features...
> ERROR: IllegalArgumentException: point array must contain 0 or >1 elements

In the past few days Markus Metz has fixed some topology issues in
GRASS GIS 7 (potentially to be backported while that's a big task).
Do you have any chance to try this in GRASS 7, downloading a version
newer than RC1 (fixes will go into RC2)?

markusN

  
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