Quantitative School Bus Stop Risk Assessment of Redlands, California

Claiborn Lewis Phillips, University of Redlands


The purpose of this Project was to identify public school bus stops in the city of Redlands with certain risks. Those risks being violent crimes, drug related crimes and the homes of convicted sex offenders. The MIP made use of the Kernel density function along with the Getis-Ord Hotspot function in ESRI’s ArcGIS 9.1 software. These functions were both used alone and combined. The Kernel Density function was used alone to derive a density surface that would be reclassified to produce a risk surface that would identify the risk of the school bus stops. The Hot Spot Analysis (Getis-Ord Gi*) with and without (z-score) Rendering were use in combination with the Kernel Density function. The pairing of these two functions, Kernel density and Hot Spot Analysis, was utilized to produce surfaces that would act as visual aids to better identify hot and cold spots. These surfaces were generated by using the Hot Spot Analysis functions to compute the Getis-Ord Gi* (with and without rendering) values. Those values were then used as the Population field for the Kernel density function that produced Hot Spot/Kernel density surface. These results were used to produce maps to aid police officers, and school officials and produce an IMS site to inform the parents of the community.