1. Polygons What are… What is Bias? What is Best?
Preset Polygons
Alert Message Polygons
Subject event Polygons
What is Bias?
What is Best?
What is a motion vector?

2. Preset polygons translate to geocodes in a CAP file that then make heavy use of lookup tables (common in non-GIS CAP based systems)

3. Alert message polygons define the area to be alerted (used when mapping to broadcast assets within the affected area)

4. Subject event polygons define the threat zone of the hazard as it exists at T+0 and the motion vector provides advanced systems with the information needed to progress the polygon through time

5. Questions? Preset polygons subject to heavy over-alerting
Preset polygons subject to maintenance overhead
Alert message polygons define the area to be alerted (when mapping to assets within the affected area)
Alert message polygons more likely in public alert based systems
Subject event polygons require advanced interfaces to message originators
Subject event polygons more likely in incident management systems
Subject event polygons can be converted to the other two but this would require two or three alerts
Subject event alerts and Action based alerts
Fire zone vs. Evacuation zone
Contaminated Water zone vs. Boil Water zone
May require the use of an PTF (Protocol Transfer Function)