Abstract
This paper shows an example that newly constructed building with an area of 50 tsubo or more (1 tsubo=3.3 square meters) in the period of two temporal data acquisition was detected by analyzing the two temporal SPOT/HRV P-mode data. Important keys for detecting such small land cover changes on the SPOT/HRV P-mode composite image are;
(1) Accurate registration of two temporal images within 0.5 pixel residuals in root mean square.
(2) To identify the land cover change by interpreting the revealed color on the two-temporal color composite.
Two test areas were chosen along the Den-entoshi line in the western suburbs of Tokyo where the land has been developed rapidly in recent years. Two temporal SPOT/HRV P-mode data acquired on October 17, 1986, and January 31, 1989 were chosen. The constructed buildings in the period can be detected on the composite color image by red. As a result of on-site investigation of 18 detected points, the authors found new buildings constructed in the duration at the points or some special reasons explaining the apparent land cover changes. Such small housings with 50 tsubo have never been detected from temporal satellite imageries so far. Although it is difficult to specify the change content, the capability of such small land change detection as shown in this work may contribute to the land management method for local government administration.
