Abstract
 Conflating a Traffic Model Network with a Road Inventory Track: Transportation Author(s): David Knudsen Traffic modelers need to derive attributes of their abstracted networks from road layers maintained by highway departments, and planners want to present model predictions using these road layers, which the public recognizes and understands. GIS and data analysts may be responsible for developing and maintaining a codified relationship between the two data stores, neither of which they own or control. In the worst possible case, both stores may be completely redesigned simultaneously, breaking previously created relationships. Both out-of-the-box and ArcObjects-customized GIS tools making use of path finding on network datasets, topologies, versioned editing, SDE views, and carefully-designed symbolization ease the task of conflating two related but dissimilar data layers and error-checking the resulting many-to-many relationship. With both planning and hindsight, the conflation can become more responsive to continuing edits to the member data layers and more resilient to future wholesale changes. David Knudsen Boston MPO Central Transportation Planning Staff 10 Park Plaza, Ste. 2150 Boston , MA 02116 US Phone: 617-973-7128 Fax: 617-973-8855 E-mail: dknudsen@ctps.org |
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