The Behavioral Risk Factor Surveillance System (BRFSS) is a state-based system of health surveys that collects information on health risk behaviors, preventive health practices, and health care access primarily related to chronic disease and injury. For many states, the BRFSS is the only available source of timely, accurate data on health-related behaviors.

The Tarrant County Public Health (TCPH) and Biosense collaboration is an effort to visualize TCPH health data collected by Biosense using Google Fusion Table technology and make that visualization publicly available. The data consists of patient visits to hospital emergency departments associated with Tarrant County Public Health (TCPH) that had the illness Gastro Intestinal, Heat Related, or Upper Respiratory divided by all emergency department visits that occurred for the same time period and in the geographic granularity for which the calculation was made.