一种扩展的土地覆盖转换像元变化检测方法

An Extended Dectection Method for Land Cover Transformation

基于土地覆盖类型的遥感影像分类结果,改进了一种扩展的基于比较叠合像元的变化检测方法,用于分析城郊土地覆盖类型的变换情况.这种扩展的变化检测方法可同时实现多种土地覆盖类型间的变化检测,依据土地覆盖类型图像中不同类型具有不同的灰度值或RGB(三元色)值的特点,将灰度的或RGB彩色的土地覆盖类型图像重叠得到土地覆盖变化图像,从而统计各种土地覆盖类型的定量转化.以上海市嘉定区1989年、1995年、2001年和2006年4期LandsatTM遥感影像为例,应用该检测方法,计算了1989年及1995年、1995年及2001年和2001年及2006年3个年份间隔各种土地覆盖类型的面积变化和相互转换数据,验证了扩展的变化检测方法的适用性.

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.