1. Archiving Capability of Spatio-temporal Data in Different Highway Railroad Grade Crossings Databases Hang Yue, Graduate Research Assistant Elizabeth G. Jones, Ph.D., Associate Professor University of Nebraska-Lincoln UNIVERSITY OF NEBRASKA-LINCOLN

2. Relational Databases Strengths – Widely used – Powerful tools Limitations – Limited ability to capture spatial relationships – Time must be represented in a discontinuous way UNL HRGC Relational Database Representation UNIVERSITY OF NEBRASKA-LINCOLN

3. GIS Spatial Databases Strength – Combine time with traffic attributes and continuous spatial data Limitation – Time is also discontinuous in GIS UNL HRGC Geo-spatial Database Representation UNIVERSITY OF NEBRASKA-LINCOLN

4. UNL HRGC Constraint Database Representation Constraint Databases Strengths – Time-dependent, multi- dimensional, relative space – Dynamic view of multiple data elements Limitation – Models of geographic elements (due to current software limitations) UNIVERSITY OF NEBRASKA-LINCOLN