[GRASS-dev] [GRASS GIS] #1256: leftover node when deleting boundaries vertex-by-vertex

[GRASS GIS]

#1256: leftover node when deleting boundaries vertex-by-vertex
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 Reporter:  shaneL  |       Owner:  grass-dev@…              
     Type:  defect  |      Status:  new                      
 Priority:  normal  |   Milestone:  6.4.1                    
Component:  Vector  |     Version:  6.4.0 RCs                
 Keywords:          |    Platform:  Linux                    
      Cpu:  x86-32  |  
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 further to posting about this on grass-users mailing list, was advised to
 file bug (my first attempt, hope I get this right...)

 to reproduce issue;[[BR]]

 1. run v.digit (I am using defaul tcl/tk monitors in my ubuntu 10.04
 install)


 2. create a new vector 'node_issue', or can get same result in an existing
 vector.

 3. choose from GUI 'boundary' tool, draw a boundary. I set options as 'no
 category' and not to add entry to table, though doubt this affects issue.


 4. whether the boundary is closed or open after digitising, didn't affect
 the final result either


 5. choose 'remove vertex' tool, and click on any vertex (start, end, or
 anywhere in the middle), and continue clicking on vertices, thereby
 deleting them, until you arrive at the last vertex remaining for the
 boundary.


 6. it appears to be deleted, but then a red cross remains. red cross in
 v.digit settings means Node (1 line) for my install. this red cross only
 visible in v.digit. opening vector in map view of grass does not show it.

 running v.info after digitising a boundary:[[BR]]

 Number of points:       0               Number of areas:      1
 Number of lines:        0               Number of islands:    1
 Number of boundaries:   1               Number of faces:      0
 Number of centroids:    0               Number of kernels:    0

 running v.info after removing vertices and having 'red cross'
 remain:[[BR]]

 Number of points:       0               Number of areas:      0
 Number of lines:        0               Number of islands:    0
 Number of boundaries:   1               Number of faces:      0
 Number of centroids:    0               Number of kernels:    0

 -this errant node can be removed using v.clean. I successfully used
 v.clean to remove such a node from a working vector without upsetting any
 of the other boundaries or centroids in the vector layer.

 after running:
 v.clean input=node_issue at Lacebark output=node_issue_cleaned type=boundary
 tool=rmline

 the v.info for the cleaned vector is:[[BR]]

 Number of points:       0               Number of areas:      0
 Number of lines:        0               Number of islands:    0
 Number of boundaries:   0               Number of faces:      0
 Number of centroids:    0               Number of kernels:    0

 Hope this explanation is of use :-)

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Ticket URL: <http://trac.osgeo.org/grass/ticket/1256>
GRASS GIS <http://grass.osgeo.org>