Difference between revisions of "Fragment"

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Revision as of 21:20, 29 March 2016

A fragment is a contiguous geographic unit created by a chop of a larger whole geographic unit. A fragment that contains the node of the whole geographic unit has that same node as the node of the fragment. A fragment that does not contain the node of the whole geographic unit has as its node the node of the largest population subunit in the fragment. Fragment nodes only serve as reference points and are not used to determine connections.

Connections for fragments follow from the connections that exist in the whole geographic unit. Paths used as connections that enter the whole unit within a fragment are links to the node of that fragment. Two fragments in the same whole unit that are locally connected are connected with a link between their nodes. In general the only links created from a chop are the links between fragments in the same whole unit.

Example 1

Isolated Fragments

Some fragments may have no connections based on the connections of the whole unit. These are isolated fragments. For isolated fragments links are created to each adjacent unit that is locally connected to the fragment node.