[Qgis-user] Topological editing of two vector layers

[Alexandre Neto]

Hello Deon,

If you have the chance, exporting both your layers to Postgres\Postgis,
would allow you to, for each district geometry, run ST_Snap[1] against its
related province geometry. With the correct tolerance, this might solve a
big part of your Boundary differences.

Even tho, you would need to check the result and correct the rest of the
problems manually.

Best regards,

Alexandre Neto

[1] http://postgis.org/docs/ST_Snap.html


On Mon, Oct 21, 2013 at 8:10 AM, Harish <harry.om2000 at gmail.com> wrote:

> If the layers are digitized by different agencies and dissolving is time
> consuming for each next higher level, then the automatic snapping of
> boundaries within tolerance distance, with keeping one layer as correct
> layer will be a useful feature.
> Regards
>
>
>
> On Tue, Oct 15, 2013 at 7:25 PM, Carlos Cerdán <sig.upagu at gmail.com>wrote:
>
>> ... or you can disolve your districts to obtain new provinces and leave
>> the old layer
>>
>> Good luck
>>
>> Carlos Cerdán
>>
>>
>> 2013/10/15 Lene Fischer <lfi at life.ku.dk>
>>
>>>  Hello Deon
>>> You can use the function Avoid Intersection while digitizing.
>>> In this way you avoid overlap - but not gaps.
>>> Read more about this issue in the usermanual
>>>
>>>
>>> http://qgis.org/en/docs/gentle_gis_introduction/06_topology.html?highlight=snap
>>>
>>> http://qgis.org/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html?highlight=snap
>>>
>>>  Regards
>>> Lene Fischer
>>>
>>>  ------------------------------
>>> *Fra:* qgis-user-bounces at lists.osgeo.org [
>>> qgis-user-bounces at lists.osgeo.org] på vegne af Pretorius Deon -
>>> Lieutenant Colonel [PretoriusDeon at saps.gov.za]
>>> *Sendt:* 15. oktober 2013 06:55
>>> *Til:* 'qgis-user at lists.osgeo.org'
>>> *Emne:* [Qgis-user] Topological editing of two vector layers
>>>
>>>   Hi, Iam new to QGIS. I have two boundary vector  layers, the one
>>> exist of polygons of all the provinces and the other of all the districts.
>>> The district boundaries must be aligned with the provincial boundaries.
>>> Since there is so much errors that needs alignment and rectification  I was
>>> wondering if there isn’t an easier way as to snap to the boundaries without
>>> to drag each vertex which is very time consuming.  Is there perhaps a way
>>> where the whole identified segments/vertex of the districts can be aligned
>>> easier to the provincial boundaries.
>>>
>>>
>>>
>>> Regards
>>>
>>>
>>>
>>> Deon Pretorius
>>>
>>>
>>>
>>>
>>>
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