A memory device comprises a memory cell array, a first and a second pre-charging switch circuits, a selecting circuit, an auxiliary memory cell array, a dynamic voltage controller and a sense amplifier. Aerial photography of at least part of the survey site can be analyzed using photogrammetric techniques. The samples may be interpolated to generate an early interpolation and a late interpolation for each of the samples. The security proxy framework utilizes a data structure that provides a method for storing selected security information stored as data records supporting an authentication and authorization system for users to access resources on multiple components of a distributed network supporting multiple business units of an enterprise.