An Extended Dectection Method for Land Cover Transformation

Abstract:

Change and transformation of land cover types in suburban area are studied with an extended pixel comparison change detection method based on remote sensing classification.The extended method supports change detection of diverse land cover types synchronously. According to the characteristic that different land cover type is denoted by different gray value or RGB color in imagery, the changes of land cover types and transformation between them were statistically computed on the basis of overlapping land cover imageries of gray or RGB color to land cover change imageries.Taking Jiading District of Shanghai as an example,the change information of various land cover area and transformation processes between land cover types were first detected in the threeyear intervals of 1989—1995,1995—2001 and 2001—2006 by extended change detection method based on the land cover classification for four typical Landsat TM imageries in 1989,1995, 2001 and 2006, and the practicability and applicability of the extended change detection method are accordingly verified.