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I'm trying to construct a view in PostgreSQL that simplify polygons according to the map scale-factor. Basically I was reading this thread http://linfiniti.com/2011/06/scale-dependent-generalization-in-postgis-and-qgis/ and I managed how to do it in QGIS, but about POstGIS I was rather confused. Can someone highlight me?

Another detail, I already have three different tables each one at a different simplified vision. I just need a query that assembly these ones declaring the factor scale for each one.

  • How are you rendering the data - through a wms/wfs/direct to postgis?? Can't you just set in QGIS to display each layer at the appropriate zoom? – lolcat Jul 8 '15 at 13:41
  • I can set it in QGIS, but it's not enough. I need a WMS layer to load in Geoserver. I need a single layer whether a shapefile or a query into PostGIS. – user3520314 Jul 8 '15 at 13:49
  • So are you needing PostGIS to alter the simplification of a dataset, served through GeoServer based upon the zoom level of the WMS rendered by QGIS? – lolcat Jul 8 '15 at 13:56
  • not necessary the zoom level must be from QGIS. I used QGIS only to have an idea of the final result. The aim is a query that merges the 3 (or even more) tables (that I already have in PostGIS) each one with a different level of simplification. Once I have this query I can decide how to pass this to Geoserver: as a shapefile or a PostGIS layer. I apologize for maybe repeating myself, but I'm not too skilled with GIS softwares & Co. – user3520314 Jul 8 '15 at 14:06