[GRASS-user] converting lines to polygons

[Micha Silver]

On 09/22/2010 02:40 PM, Bryan Keith wrote:
>> On 09/22/2010 12:45 AM, Bryan Keith wrote:
>>      
>>> Hello,
>>>
>>> I'm using these commands:
>>>
>>> v.clean input=test_ln output=testclean_ln tool=snap,bpol thresh=0.2,0
>>> v.type input=testclean_ln output=testclean_bnd type=line,boundary
>>> v.centroids input=testclean_bnd output=testclean_py
>>>
>>> trying to convert a bunch of lines to 5 polygons.  I've tried lots of
>>> variations of v.clean including many snap thresholds, but I can only get
>>> 3
>>> polygons.  Is there something I'm doing wrong?
>>>
>>>        
>> If it's only two missing, then just manually add centroids to those two
>> areas that are not yet polygons. (using v.digit)
>>      
> Well, it's two in this simple little example clipped from a larger file,
> and I have lots of files to process so I'm looking for an automated
> process.
>
>    
Can you figure out why other areas were not closed? Maybe you need a 
larger threshold value?
By opening the vector with v.digit you'll see by the color coding of the 
nodes which are part of closed boundaries (dark green) and which are on 
a "broken" boundary (red).
You'll also see quickly where you have centroids inside correct 
boundaries, and where you're missing them.

> Bryan
>
>    
>>> Check out the line and polygons here:
>>>
>>> http://www.ideotrope.org/~bryan/lines.png
>>> http://www.ideotrope.org/~bryan/polygons.png
>>>
>>> Bryan
>>>
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>>>
>>>
>>>        
>>
>> --
>> Micha Silver
>> Arava Development Co. +972-52-3665918
>> http://surfaces.co.il
>>
>>
>>
>>      
>
>
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>
>
>    


-- 
Micha Silver
Arava Development Co. +972-52-3665918
http://surfaces.co.il