关键词: TM影像, 土地利用/覆被变化, 动态监测, 商丘市

Abstract:

 Changes in land use and land cover is a vital part of global climate change, is also one of the reasons. This paper, based on Landsat TM images of 1990 and 2004, by using RS and GIS softwares to make the Principal Component Analysis and NDVI analysis, acquires land use classes data according to the maximum likelihood method with assistance of the artificial visual interpretation, and studies the land use type and spatial change. The results show that the main land use type is arable land in Shangqiu, with areas 1 535.47 km² and 1 327.33 km², accounting for 87.40 and 75.55 percent of the total land area in 1990 and 2004 respectively. From 1990 to 2004, 212.75 km² arable lands were converted into construction land reducing 208.14 km² totally, accounting for 13.56 percent of arable land of 1990. Forest land increased 34 km², construction land 141.91 km² accounting for 74 percent of construction land of 1990, which mainly converted from arable land. Classification accuracy can be improved by using of the synthesized means.

Key words: TM image, changes in land use and land cover, dynamic monitoring, Shangqiu