Ring Definition in 5.1 and Later

In a Ring Accumulation analysis, Ring Definition enables you to define the ring radius and damage ratio for each ring.

You can create a single ring on each location or a set of concentric rings. The concentric ring option is not available for Dynamic Ring Analysis because this type of ring analysis generates rings after the analysis.

Users can choose not to generate multiple rings on the same latitude/longitude. Each ring around a location (single ring or multiple rings) acts as a single accumulator or as a single event. In the case of concentric rings, each band in the concentric ring acts as a sub accumulator and the damage ratio is applied based on that band. The latter option can be useful for modeling fire or terrorism events.

To define a ring as an accumulator:

1.     After selecting Ring Accumulation as the analysis type, select Step 2 - Configure.

2.     On the Accumulate tab, in the Ring Definition area, click the plus symbol (+) to add a new concentric ring.

3.     In the Radius field, enter a decimal number.

If you are going to select kilometers and miles as the unit of measurement, enter a decimal number greater than "0".

4.     In the Unit field, select the unit of measurement (feet, kilometers, meters, or miles).

5.     In the Damage Ratio field (for property exposures only), enter the percentage.

Usage notes

•       The following table summarizes the defaults for the Radius field. The default radius is smaller for Dynamic Ring analyses because larger rings, which may generate more potential ring points, increase the analysis time.

•       For Dynamic Ring analyses, if you specify a radius greater than 1.0 kilometers or miles, you must also select the "Override Recommended Radius" option.

•       You can create multiple concentric rings for all supported ring accumulation analyses. The concentric ring radiuses must be in ascending order, for example, 100, 200, 400, 500.

Related topics

•       Ring Accumulations in 5.1 and Later