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Track: Transportation, Logistics Planning
Janet Gritzner
South Dakota State University
Box 504
Brookings, SD 57007
Telephone: 605-692-4643
Fax: 605-688-4030
E-mail: gritznej@mg.sdstate.edu
Address Matching Accident Records Using a Map Reference Coordinate System
Defining Issue: State-recorded accident record data are often logged by mileage reference marker (MRM) or by map reference coordinates. Using accident data with map reference coordinates in address matching applications requires conversion of XY map locations to a route measure for reference system. GIS Solution: The street centerline for Sioux Falls, South Dakota, was geocoded with XY map references. Accident record XY map locations are converted to street names with address ranges. Normal address-matching routines are used to locate along-the-street and intersection accidents. These data will be used in ArcView for accident analysis including development of collision diagrams. Methodology: XY map locations were assigned to node intersections of the Sioux Falls street centerline data set through a series of coordinate transformations. Arc from-X and to-X and from-Y and to-Y map references were derived from the intersection coordinate values. Street-arcs were assigned X or Y constants and
from-addresses and to-addresses dependent on street orientation. Route systems were constructed based on street names with measures taken for from-address and to-address attributes. Lookup tables were developed from the route section INFO table. These tables were used to assign street names to the accident records. Once accidents were located by street name, the accidents were matched to the street centerline data set through normal address-matching procedures. Software: The application was prepared using ArcInfo and PC ARC/INFO. Address-matching may be accomplished in ArcView, ArcInfo, or PC ARC/INFO.
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