Hello qgis users I hope this is the right place to ask for help in selecting the right strategy to spped up the data served by qgis-server/lizmap
I have many polygonal features that can be seen at various zoom level I want to serve them as a webis with qgis-server and Lizmap Data are on a postgis server with all indexes set. I had some suggestion to simplify the geometry let's say with 3-4 simplyfication level on the nodes of any polygon. So I made 3 geometry column (orig - simpl1, simpl2 ecc) all the same kind of the original one and each field with its index. In simpl1, 2 3 ecc I calculate a simplification with ST_SimplifyPreserveTopology(geometry , float) with increasing tolerance based on original geometry. Now I will like to use these geometry columns to load simpler features at low zoom and richer ones at higher zoom level. Is it possible to tell qgis to load a particular geometry column based on the zoom level? This thing should be also available in qgis-server and then in lizmap.. One solution I found was to make different view/query to load layers with the desired geometry column and use visibility based on scale to show/hide different layers.. Any other way? Is it preferable to create views in Postgis or to query data by qgis db manager? Thanks for your help Pietro -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Qgis-qgis-server-different-layer-scales-to-speed-up-server-tp5251409.html Sent from the Quantum GIS - User mailing list archive at Nabble.com. _______________________________________________ Qgis-user mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
