Changes between Version 4 and Version 5 of UsersWikiTopoGeometry


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Timestamp:
Mar 15, 2012, 3:35:00 PM (11 years ago)
Author:
martinl
Comment:

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  • UsersWikiTopoGeometry

    v4 v5  
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    4 A !TopoGeometry is a PostGIS type used to represent geometries defined
    5 by Topological elements (Face,Edge,Node,!TopoGeometry).
     4A '''!TopoGeometry''' is a PostGIS type used to represent geometries defined
     5by topological elements (face, edge, node,!TopoGeometry).
    66
    77Current code implements the !TopoGeometry using a class defined
    8 under the topology schema (topology.!TopoGeometry). This has the
     8under the topology schema (`topology.!TopoGeometry`). This has the
    99following fields:
    1010
    11  * topology_id integer
    12  * layer_id integer
    13  * id integer
    14  * type integer
     11 * `topology_id integer`
     12 * `layer_id integer`
     13 * `id integer`
     14 * `type integer`
    1515
    16 The actual _definition_ of each !TopoGeometry is contained in the [wiki:TopologyTableRelation relation] table of the topology identified by "topology_id". The "relation" table contains a record for each component of each TopoGeometry. Interpretation of the component also requires looking at the [wiki:TopologyTableLayer topology.layer] table, which tells if element_type refers to primitive type (node, edge, face) or another layer (in case of hierarchical !TopoGeometry).
     16The actual _definition_ of each !TopoGeometry is contained in the [wiki:TopologyTableRelation relation] table of the topology identified by `topology_id`. The "relation" table contains a record for each component of each !TopoGeometry. Interpretation of the component also requires looking at the [wiki:TopologyTableLayer topology.layer] table, which tells if element type refers to primitive type (node, edge, face) or another layer (in case of hierarchical !TopoGeometry).
    1717
    1818See [wiki:UsersWikiCreatingTopoGeometryObjects CreatingTopoGeometryObjects] for information on how to create a !TopoGeometry.