Patent ID: 8285050

Claim:
A house change judging method for judging a change of a house in a data acquisition region based on new data and old data concerning two periods, which have been aerially acquired, comprising: extracting as a judgment target region a predetermined region in the new data and the old data concerning the two periods by trimming with house polygon data corresponding to a predetermined region prepared in advance; computing, after the extraction, as evaluation values, two kinds of difference values between the new data and the old data concerning the two periods with respect to a gradation value of color image data and an altitude value of altitude data across the entire judgment target region, the computing being performed by a microprocessor and the altitude data being obtained from a digital surface model; and judging, after the computation, based on the evaluation values, whether a house change has occurred in the judgment target region by referring to a judging table including combinations of two kinds of preset evaluation criterion values, the judging being performed by a microprocessor.