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The Closest Facility Solver returns facilities that are not closest when using the Hierarchy option and the following conditions:
- Less than 20% of the total number of facilities is being sought.
- The network being analyzed is an SDC (smart data compression) network with four hierarchy levels.
- The highest hierarchy level in the network is very sparse.
When the Hierarchy option is selected, the Closest Facility solver determines which facilities are closest to each incident. This is done by growing a shortest path tree from the incident until the number of facilities found is completely within the spatial extent of this shortest path tree.
All facilities outside of the spatial extent are assumed to be further than those within the spatial extent, even though some of these facilities actually can be closer.
Use one of the following options to avoid this behavior: