[GRASSLIST:5840] Re: v.buffer - my buffer is a mess

[Radim Blazek]

v.buffer is buggy, try 2x15000.

Radim

Maciek Sieczka wrote:
> Hi
> 
> Please see the attached screenshots. These are supposed to be the 30km 
> buffers for the 'odra_glogow_brzeg_cl' (blue), a vector line, 
> topologically clean for sure.
> Why are the buffers so awfull? There isn't anything special about my 
> input data or whatever. Any guess?
> 
> The vbuffer.png was made with 'debug=buffer':
> 
> v.buffer input=odra_glogow_brzeg_cl output=odra_glogow_brzeg_cl_buf30
> type=line layer=1 buffer=30000 tolerance=0.01 debug=buffer
> 
> GRASS_INFO_MESSAGE(20920,1): The tolerance in map units: 300
> Lines buffers ...
> 
> Rebuilding topology ...
> Building topology ...
> Registering lines:
> 1 primitives registered
> Building areas:
> 
> 1 areas built
> 1 isles built
> Attaching islands:
> 
> Attaching centroids:
> 
> Topology was built.
> Number of nodes     :   1
> Number of primitives:   1
> Number of points    :   0
> Number of lines     :   0
> Number of boundaries:   1
> Number of centroids :   0
> Number of areas     :   1
> Number of isles     :   1
> Number of areas without centroid :   1
> 
> 
> 
> 
> And vbuffer2.png made with debug=clean:
> 
> v.buffer input=odra_glogow_brzeg_cl output=odra_glogow_brzeg_cl_buf30
> type=line layer=1 buffer=30000 tolerance=0.01 debug=clean
> 
> GRASS_INFO_MESSAGE(21567,1): The tolerance in map units: 300
> Lines buffers ...
> 
> Building parts of topology ...
> Building topology ...
> Registering lines:
> 1 primitives registered
> Topology was built.
> Number of nodes     :   1
> Number of primitives:   1
> Number of points    :   0
> Number of lines     :   0
> Number of boundaries:   1
> Number of centroids :   0
> Number of areas     :   -
> Number of isles     :   -
> Snapping boundaries ...
> Registering points ...
> 
> All vertices:   117
> Registered points (unique coordinates):   116
> Nodes marked as anchor     :   116
> Nodes marked to be snapped :     0
> Snaps:     0
> Snapped vertices :     0
> New vertices     :     0
> Breaking boundaries ...
> Intersections:     0
> Intersections:    22
> Removing duplicates ...
> Duplicates:     0
> Duplicates:     1
> Duplicates:     2
> Duplicates:     3
> Duplicates:     4
> Attaching islands ...
> Building topology ...
> Building areas:
> 
> 5 areas built
> 0 isles built
> Attaching islands: Topology was built.
> Number of nodes     :   12
> Number of primitives:   36
> Number of points    :   0
> Number of lines     :   0
> Number of boundaries:   36
> Number of centroids :   0
> Number of areas     :   5
> Number of isles     :   0
> Number of incorrect boundaries   :   14
> Number of areas without centroid :   5
> Rebuilding topology ...
> Building topology ...
> Registering lines:
> 24 primitives registered
> Building areas:
> 
> 5 areas built
> 0 isles built
> Attaching islands: Attaching centroids:
> 
> Topology was built.
> Number of nodes     :   16
> Number of primitives:   24
> Number of points    :   0
> Number of lines     :   0
> Number of boundaries:   19
> Number of centroids :   5
> Number of areas     :   5
> Number of isles     :   0
> Number of incorrect boundaries   :   14
> 
> Maciek
> 
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