Details Ticket 257


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Serial Number 257
Subject v.cutter: size of the region seems to influence v.cutter
Area bug
Queue grass
Requestors neteler@itc.it
Owner none
Status resolved
Last User Contact Never contacted
Current Priority 30
Final Priority 70
Due No date assigned
Last Action Tue Apr 16 21:48:20 2002 (6 yr ago)
Created Wed May 2 13:56:19 2001 (7 yr ago)

Transaction History Ticket 257


Wed, May 2 2001 13:56:19    Request created by mneteler  
Subject: v.cutter: size of the region seems to influence v.cutter

v.cutter: size of the region seems to influence v.cutter

Case history:
  For reducing the volume a rather large vectormap (16.000 polygons) I wrote
a
  grass5-script which                                                       
1. automatically generates a rectangle around the current region (works at
       least with tmerc,lat/long,lambert-projection)                        
2. cuts the original map with v.cutter                                    
    3. runs v.spag -i and v.support                                         
This works fine, but only sometimes. I cut country outlines, DEM-contours   
(created with r.contour) and a map with soil properties and I noticed that  
the size of the region seems to influence v.cutter. If, for example, i cut  
parts of the coastline of norway, v.cutter works for a region with a maximum
of 6 geographic degrees, a wider region produces an empty vector file. The  
DEM-contour-map, which seems to contain much more data, can be cut using a  
region of any size.                                                         
Thus it appears that certain combinations of datafile and cutterfile cause  
v.cutter to generate no vectors at all. I don't see any rule as to when it  
works an when it doesn't so I think that this might be some bug in
  v.cutter.  
 (reported by Stefan.Neumann@agrar.uni-giessen.de)
Fri, Nov 9 2001 13:24:00    Comments added by alange  
This is still true. v.cutter does not work reliable.

Andreas
Fri, Jan 4 2002 18:10:39    User changed to neteler@itc.it by mneteler  
Tue, Apr 16 2002 21:48:15    Comments added by mneteler  
Some fixes were applied. The bug is not reproducable according
to Roger.
Tue, Apr 16 2002 21:48:20    Status changed to resolved by mneteler  
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