Used to compute areas and perimeters of shapes, and areas inferred from boundaries and centroids. The area and perimeter values are then loaded into the designated area and perimeter fields for each polygonal area. For inferred areas, the database linkage must be on the centroids and for shapes, the linkage must be on the shape element. It is possible to apply divisor scale factors to convert the areas from square master units to an alternative scale. For example, convert square feet to acres.