[GRASS-user] V.overlay very slow

[incanus]

that's an example with quad3 + quad4

############OUTPUT OF V.PATCH

Patching vector map <quad3 at andresfr@andresfr>...

42 primitives registered
922 vertices registered
Building areas...
26 areas built
24 isles built
Attaching islands...
Attaching centroids...
Number of nodes: 40
Number of primitives: 42
Number of points: 0
Number of lines: 0
Number of boundaries: 26
Number of centroids: 16
Number of areas: 26
Number of isles: 24
Number of areas without centroid: 10
Intersections at borders will have to be snapped
Lines common between files will have to be edited
The header information also may have to be edited
v.patch complete. 2 vector maps patched
Patching vector map <quad4 at andresfr@andresfr>...
Building topology for vector map <test>...
Registering primitives...


#########OUTPUT OF V.OVERLAY

Copying vector objects from vector map <quad3 at andresfr>...
Copying vector objects from vector map <quad4 at andresfr>...
Collecting input attributes...
Collecting input attributes...
Building partial topology...
Building topology for vector map <test2>...
Registering primitives...
26 primitives registered
906 vertices registered
Number of nodes: 24
Number of primitives: 26
Number of points: 0
Number of lines: 0
Number of boundaries: 26
Number of centroids: 0
Number of areas: -
Number of isles: -
Breaking lines...
Removing duplicates...
Cleaning boundaries at nodes...
26 areas built
Attaching islands...
Number of primitives: 37
Number of lines: 0
Querying vector map <quad3 at andresfr>...
Number of nodes: 47
Building topology for vector map <test2>...
47 primitives registered
22 isles built
Attaching centroids...
Number of nodes: 43
Number of points: 0
Number of areas: 26
Number of isles: 22
v.overlay complete.  

Number of areas without centroid: 10
Number of lines: 0
Number of boundaries: 31
Number of centroids: 16
Number of primitives: 47

Attaching islands...
26 areas built
925 vertices registered
Building areas...
Registering primitives...

Rebuilding topology...
Number of areas: 26
Number of isles: 22
Number of areas without centroid: 10

Number of primitives: 53
Number of points: 0
Number of lines: 0
Number of boundaries: 37
Number of centroids: 16

Attaching centroids...
Building topology for vector map <test2>...
Attaching centroids...

Writing centroids...

Querying vector map <quad4 at andresfr>...

Number of boundaries: 37
Number of centroids: 0
Number of areas: 26
Number of isles: 22
Number of areas without centroid: 26

Number of points: 0

Number of nodes: 31

22 isles built

Attaching islands...
Building topology for vector map <test2>...
Building areas...


Markus Metz-2 wrote:
> 
> incanus wrote:
>> By the way,
>> i don't know if what i've done is correct and can be a usefull "trick",
>> or
>> it's a rookie mistake, or a casuality. I hope someone knows why this
>> happens, and could help anyone.
>>
>> This is:
>>
>> After trying the "v.patch, v.clean(break,rmdupl), v.build" thing,
> v.build is not needed after v.clean.
>>  it was the
>> moment to create a new column for all geometries, in order to run
>> v.dissolve.
>> Then, v.dissolve doesn't worked. I see that v.info gives different
>> information (number of boundaries, areas, islands...) of the "same" map,
>> obtained from v.overlay's or v.patch,v.clean... 
>>   
> Can you post that information, or better the output of v.build for each 
> map (not all the input maps, only the results of v.patch and v.overlay)? 
> Look out for "number of incorrect boundaries", "number of duplicate 
> centroids" and "number of centroids outside area", that means that there 
> is still something wrong with vector topology.
> 
> Markus M
> 
> 
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
> 
> 

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