Polygon networks define the relationships between boundary segments or connectivity of features, adjacency to polygons and relationship of an interior polygon centroid to user defined attributes. When topologically correct, analysis of both graphical and attribute data may be displayed. Examples of these networks within the DCDB are the road centreline linear network, and parcel and meshblock polygon networks. Attribute Data Attribute data are stored in two-dimensional user defined tables. Two types of user defined tables exist, primary and indirect tables.
Primary tables contain data directly related to a geographical feature such as a centroid.
Within the DCDB primary tables are used to store user defined attributes for parcels and roads. Indirect tables contain data not necessarily related to only one feature and may contain records defining relationships using unique keys from two or more primary tables. LINZ does not warrant that it is possible to form full topology on data, but will use its best endeavours to achieve this if the client needs it. Topological information may not necessarily transfer between systems during data conversion. However, by maintaining topology within the DCDB, formation of topology on other systems with this facility can be easily achieved with little further work.