Accumulating Values by Rings


You typically accumulate exposures by concentric rings for terrorism risk analyses. The Ring Definition pane enables you to define the rings in which to accumulate your exposure data. Defining a ring involves specifying the placement of the rings based on specific criteria, filtering the exposures based on peril and geocode match level, and defining the ring radius and damage ratio for each ring.

         Specifying the placement of rings based on specific criteria

         Filtering the exposures (the content within the rings)

         Defining the ring radius and damage ratio for each ring

Specifying the placement of rings

You select a target based on one of four options:

       Dynamic Ring, where the analysis determines the optimal location for placing a ring of a given size. Click here for more information about the Dynamic Ring option.

       High-value locations within your portfolio, where the default is the top 1,000 risks by total replacement value.

       Locations in the AIR Landmarks database, where you can select multiple landmarks. For example, you might want to evaluate potential losses for a terrorist attack on airports and bridges near your exposures. To use this feature you must license model M01, the AIR Terrorism Model for the U.S.

       Locations included in a user-specified address list. You can manually enter addresses or copy and paste records from a spreadsheet.

       To add addresses manually, click to open the Address List Editor, click the plus symbol +, and then enter address information—the Ring Center Name, Latitude, and Longitude fields are required.

       To copy and paste records from a spreadsheet, open the spreadsheet containing the addresses, right-click the row or rows containing the addresses you want to copy, and then click Copy on the shortcut menu. In the Ring Definition pane, click the Edit icon next to Address List. Right-click in the Address List Editor and the click Paste. The copied addresses appear in the address list. Click OK to save the changes; the system displays information about the number of locations that you loaded.

Select the Remove duplicates check box if you do not want the system to place duplicate rings—rings with the same latitude and longitude—for overlapping exposure data. This option does not apply to a Dynamic Ring analysis.

Specifying the content within rings

You filter the exposure data that is included in rings by defining peril and geocode filters. For example, for a terrorism ring analysis, you may want to include only those locations in your exposure data where the geocode match level is "Exact Address,ZIP9 Centroid,Relaxed Address", or "User Supplied", but not where the geocode match level is Postal Code, City, or County Centroid. You may want to do this if your exposure data does not include accurate address information for postal, city, and county locations.

Defining the ring radius and damage ratio for each ring

After defining the target (the center of a ring) and the filters, you define the ring radius and damage ratio (%) for the concentric ring. When you define the radius, you enter a numeric value and select the unit of measurement (feet, kilometers, meters, or miles). For a Dynamic Ring analysis, the radius default is 200.00 meters; for all other ring analyses, the radius default is 500.00. The Dynamic Ring analysis has a smaller default radius size because the size of the ring can significantly affect run times; larger rings increase the analysis time because they may generate more potential ring pints.

You can create multiple concentric rings. (If  the Dynamic Ring option is selected, you cannot create multiple rings.) To add new concentric rings, click Add new concentric ring and specify the radius and damage ratio (%). For example, you may want to define three rings:

         Ring 1: two-mile radius with a damage ratio (%) of 100.00

         Ring 2: five-mile radius with a damage percent of 80.00

         Ring 3: 10-mile radius with a damage percent of 65.00


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Touchstone V3.0 Updated December 01, 2016