Moving Area Blocks How do moving area blocks
Moving Area Blocks • How do moving area blocks work with – Preset Polygons – Alert Message Polygons – Subject event Polygons Page 1 – 2020 -11 -09
Preset polygons translate to geocodes in a CAP file that then make heavy use of lookup tables (common in non-GIS CAP based systems) Page 2 – 2020 -11 -09
Preset polygons change to reflect the new time period by adding or deleting new polygons to the list of affected polygons Page 3 – 2020 -11 -09
Alert message polygons define the area to be alerted (used when mapping to broadcast assets within the affected area) Page 4 – 2020 -11 -09
Alert message polygons change to reflect the new area to be alerted (used when mapping to broadcast assets within the affected area) Page 5 – 2020 -11 -09
Subject event polygons define 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 Page 6 – 2020 -11 -09
Subject event polygons define 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 Page 7 – 2020 -11 -09
Questions? • Originators and Distributors will make assumptions realizing later • • • several approaches exist Preset polygons deprecated? Alert message/Subject event polygons result in a distribution asset that is discontinued by not mapping as an asset in the polygon rather than an expires or cancel Alert message/subject event polygons result in a message possibly starting, continuing and ending for a specific location without an Alert or Cancel involved? Subject event polygons may require more frequent updates Will likely require the use of an PTF (Protocol Transfer Function) Page 8 – 2020 -11 -09
- Slides: 8
