Abstract

Roll Your Own AVL using ArcGIS Server
Track: Computer-Aided Dispatch and 911
Authors: Baylis Carson, Brian Hennessey

Henrico County's Cad24x7 system is a modern service-oriented high-availability 9-1-1 dispatch application. It was designed and developed in-house by the County IT Department. The County has added an automatic vehicle location (AVL) capability to the system using ArcGis Server. AVL provides: GPS data capture from Police, Fire and EMS units; browser-based tiled-map for unit location visualization; Network Analyst based closest unit recommendations and unit routing features which are integrated into the existing dispatch and mobile data applications. The presentation will review: system architectures for Cad24x7 and the enterprise GIS; the role our ESRI ELA played in helping us to realize the vision; how the ArcGis Server SOAP and Rest API's were used to implement our system. This project illustrates how sophisticated unit tracking, routing, and spatial closest-unit recommendations are within the reach of the average application developer by leveraging ESRI based services to do the heavy lifting.