Folks,
I am implementing a tiled-TopoJSON server in Node,js/PostGIS, and I am puzzled by
the performance I am getting from PostGIS.
With topojson (the Node.js module), the generation of TopoJSON (the format) from a
GeoJSON input takes about 3 seconds.... while generating a topology, for the same
data of course, takes about 4 minutes with PostGIS.
I am probably doing something wrong; here's the code (the tiletest.orig_geometry
table contains base geometry), please note the 0 tolerance used:
SELECT DropTopology('tiletesttopo');
SELECT CreateTopology('tiletesttopo', 4283);
SELECT topology.AddTopoGeometryColumn('tiletesttopo', 'tiletest',
'orig_geometry', 'topogeom', 'MULTIPOLYGON');
UPDATE tiletest.orig_geometry
SET topogeom= topology.toTopoGeom(wkb_geometry, 'tiletesttopo', 1 , 0);
Regards,
Luca Morandini
Data Architect - AURIN project
Melbourne eResearch Group
Department of Computing and Information Systems
University of Melbourne
Tel. +61 03 903 58 380
Skype: lmorandini
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