Enhancing the spatial resolution of an active linear referencing system and calibrating a functional merge.

摘要

The Wisconsin Department of Transportation (WisDOT) maintains two linear referencing systems (LRS), the State Trunk Network (STN) and the Wisconsin Information System for Local Roads (WISLR). These two systems, while they were developed at different times and independently from one another, provide WisDOT the capabilities to report Highway Safety Manual data for the entire state and local road network. Because the two systems have limited data sharing capabilities, a functional merge, called the Link-Link table, was previously developed to facilitate a relationship between STN and WISLR. While data translation through the Link-Link table is acceptable, this project seeks to enhance data transfer between these two LRSs.;Certain inherent differences exist between STN and WISLR that make accurate data movement challenging even through the link-link table, notably, the poor state route representation in WISLR and the difference in business rules that govern how roadways are represented in each system. This research developed a method to enhance the 12,000 miles of state route line work in WISLR, without disrupting the daily business activities of WisDOT, to match the STN line work. Utilizing the improved WISLR state trunk line work, a method to calibrate the Link-Link table to reconcile the linear offset discrepancy that exists at gore points was developed. A case study evaluated Interstate 94 in Saint Croix County by locating 46 gore locations and calibrating 113 records in the Link-Link table. The calibration technique produced 209 new Link-Link records that were used to translate 534 crashes from STN to WISLR. Results show that greater positional accuracy can be achieved when translating data through the calibrated table.