year by the user. All the data from the queries is downloadable into a spreadsheet. At present, the database (v.10.0) contains over 710,000 records. The strengths of the SHELDUS database relate to its county-level coverage for a 50-year time period for 18 different hazard types. The consistent georeferencing over time, despite changes in county boundaries, is another added feature. The weaknesses of SHELDUS relate to the input data, culled from federal sources. The federal databases were developed for a different purpose; inconsistencies and biases in those data are transferred to SHELDUS. For example, in many reports of weather-related losses, an entire state was given in the record and the database disaggregation technique is to apportion the losses equally across affected counties when no additional data were provided. This technique results in a geographic pattern that may appear state-centric, but in reality is a function of the initial reporting of losses. SHELDUS is a database and does not predict losses based on annualized losses or other mathematical functions.
SOURCE: Information provided by S. Cutter; http://sheldus.org