[postgis-users] To correct Exterior Rings

[Rémi Cura]

You can also do the same trick, but reverted.
This time use buffer (positiv), buffer(negativ).
This should suppress the error in exterior ring.

I have to say this kind of filtering is not ideal to correct geometry ...
You would probably need a more serious way of cleaning you polygon .

Cheers,

Rémi-C


2014-02-11 17:24 GMT+01:00 Nicolas Ribot <nicolas.ribot at gmail.com>:

> Hi,
>
> You should try st_buildArea, or st_polygonize, as suggested by Remi. It
> corrects these kinds of errors.
>
> Nicolas
>
>
> On 11 February 2014 17:21, Richard LEHAUT <richard.lehaut at crpf.fr> wrote:
>
>>  My problem is the exterior ring of the polygon. There are points inside
>> of this ring
>> http://hpics.li/2807e0d
>> These points make needless segments
>> http://imagik.fr/uploads/75091 (Inside black circle)
>> Cheers,
>> Richard L
>>
>> Le 11/02/2014 17:02, Rémi Cura a écrit :
>>
>>  What is the problem?
>>  What are "internal" lines?
>>  Cheers,
>> Rémi-C
>>
>>
>> 2014-02-11 16:59 GMT+01:00 Richard LEHAUT <richard.lehaut at crpf.fr>:
>>
>>>  Thanks for response
>>> The fourth proposition is correct for external but not internal lines :
>>> ST_Buffer (ST_Buffer (the_geom), -0.1), 0.1
>>>
>>> Look http://imagik.fr/uploads/75091
>>> Do you have an idea to solve this new problem?
>>>
>>>
>>> Cheers,
>>> Richard L
>>>
>>>  Le 10/02/2014 13:56, Rémi Cura a écrit :
>>>
>>>   simplify
>>> simplify preserve topology
>>> polygonise then filter on area,
>>>  opening operator (negativ buffer of X then positiv buffer of X)
>>> ...
>>>
>>>  Cheers,
>>>
>>> Rémi-C
>>>
>>>
>>> 2014-02-10 13:43 GMT+01:00 Richard LEHAUT <richard.lehaut at crpf.fr>:
>>>
>>>>  Hi
>>>> I succeeded to correct interior rings, but I've problem wih interior
>>>> rings.
>>>> Looks this screen (black circle). http://imagik.fr/view-rl/74788
>>>> Do you idea to resolve my problem?
>>>> Thanks
>>>> Richard L
>>>>
>>>> _______________________________________________
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>>>> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
>>>>
>>>
>>>
>>>
>>>
>>
>>
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