Changes between Version 1 and Version 2 of UsersWikiSimplifyWithTopologyExt


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Timestamp:
04/10/12 09:17:58 (13 years ago)
Author:
nicolasribotosgeo
Comment:

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  • UsersWikiSimplifyWithTopologyExt

    v1 v2  
    33= Another example showing how to simplify (generalize) a multipolygon layer using PostGIS Topology =
    44
    5 This article is a kind of "follower" for this one: UsersWikiSimplifyPreserveTopology, showing another method to build generalized polygons keeping their spatial relationship.
     5This article is a kind of "follower" for this one: UsersWikiSimplifyPreserveTopology, showing another method to build generalized polygons keeping their spatial relationship, based on spatial operators and SQL queries.
    66
    7 It uses the PostGIS Topology module ([http://postgis.org/documentation/manual-2.0/Topology.html]) and aims at producing
     7This example uses the PostGIS Topology module ([http://postgis.org/documentation/manual-2.0/Topology.html]) and aims at producing a simplified polygonal layer, with initial polygons' attributes correctly associated to simplified polygons
    88
    9 A big thank to Brent Wood for its Topology Example and to Sandro Santilli for the topology module
     9(''A big thank to Brent Wood for its Topology Example and to Sandro Santilli for the topology module'')
    1010
    1111== What we want ==
    1212
    1313|| Simplifying this layer: || into this: || avoiding that:
    14 || [[Image(wiki:UsersWikiSimplifyPreserveTopology:SPT_dept_ori.gif)]] ||  [[Image(SPT_dept_sim.png)]] || [[Image(SPT_no_topo.png)]] ||
     14|| [[Image(wiki:UsersWikiSimplifyPreserveTopology:SPT_dept_ori.png)]] ||  [[Image(wiki:UsersWikiSimplifyPreserveTopology:SPT_dept_sim.png)]] || [[Image(wiki:UsersWikiSimplifyPreserveTopology:SPT_no_topo.png)]] ||
    1515
    1616== The data ==
    … …  
    9191== Results ==
    9292
    93 This method produces a clean result:
     93This method produces a clean result, departement's codes are correcty re-associated:
    9494
    95 
     95 [[Image(wiki:UsersWikiSimplifyPreserveTopology:SPT_dept_sim.png)]]
    9696
    9797== Notes ==
    9898
    99 Find a way to associate faces to initial polygon using topology, not using spatial operations.
     99Find a way to associate faces to initial polygon using topology, not using spatial operations. see strk mail