To ensure the accuracy of information related to residential slab claims, the association must:(1) gather and, not less frequently than once every year, update applicable pre-event data on insured structures located in the area described in §5.4029(a) of this title. The pre-event data consists of characteristics--specified in the damage estimation module--pertinent to the performance of each insured structure during an applicable storm; and(2) acquire pre-event high-resolution aerial and on-ground photographs of structures located in the area described in §5.4029(a) of this title to define building characteristics and terrain.