I fugured it out.
This is an example on how to build a topology with more than one layer
contributing:
select topology.CreateTopology('topo', 3857)
--creating topo geom : layer 1
select AddTopoGeometryColumn('topo', 'schema', 'table_a', 'topogeom',
'MULTIPOLYGON')
--creating topo geom : layer 2
select AddTopoGeometryColumn('topo', 'schema', 'table_ab', 'topogeom',
'MULTIPOLYGON')
-- inserting data from vegatacao
select toTopoGeom(geom, 'topo', 1, 5) from schema.table_a
-- inserting data from massa dagua
select toTopoGeom(geom, 'topo', 2, 5) from schema.table_b
The snap is performed according to the insertion order when populating the
topology.
Em sexta-feira, 16 de setembro de 2016 18:01:36 UTC-3, Luiz Andrade
escreveu:
>
> Hi there,
> My name is Luiz Claudio and I'm a QGIS plugin developer.
> Here in Brazil we have a quite complex Spatial Data Structure (more than
> 200 layers).
> Recently, our cartographic production has changed to QGIS, but until today
> we use GOTHIC LAMPS2 from Laser-Scan to deal with topology.
>
> As we are studying Postgis topology and I would like to ask you guys some
> questions.
>
> Question1:
> How can I build one topology with contribution of several layers?
> Our Spatial Data Structure needs to be validated considering several
> layers. For example, the vegetation and hydrography layers should build one
> topology because one has influence in the other.
>
> In a topology structure like the one mentioned above, is it possible to
> set priorities to perform the snap the layers?
> For instance, one layer should be used as reference to snap other layers
> according to a priority when creating the topology structure.
>
> Thanks for your help in advance.
>
> Regards,
> Luiz Claudio.
>
>
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