重庆市主城区土地利用时空变化的图谱分析

利用重庆市主城区1988、2000、2007年3期TM影像,通过监督分类和目视解译相结合获取3期土地利用空间数据。基于地学信息图谱分析方法,合成了一系列土地利用格局变化图谱及转移矩阵,定量分析了重庆市主城区土地利用空间格局和变化过程。结果表明,重庆主城区在1988～2007年20a间土地利用格局发生显著变化。在1988～2000年间,灌木林大幅度减少,减少面积达760.59 km2,旱地增长幅度达829.31 km2。在2000～2007年间,旱地大幅度减少达428.80 km2,而灌木林增长了206.03 km2。1988～2007年,水体整体变化不大,有林地开始呈现增长趋势,城市建设用地一直呈增长趋势并且在2000～2007年的增长速度明显大于1988～2000年,表明重庆市城市化进程进一步加速。

Spectrum Analysis on Spatio-temporal Variation of the Land Use in Major City Zone of Chongqing

According to the TM images of the major city zone of Chongqing in 1988,2000 and 2007,the land use data at the three time periods was obtained by supervised classification and visual interpretation.Based on geo-information analysis,a series of spectra and transfer matrix about the land use pattern changes were synthesized,the spatial variation of land use patterns was quantitatively analyzed.As indicated by the results,the land use pattern in the major city zone of Chongqing changed significantly during the 20 years from 1988 to 2007.During 1988-2000,the area of shrub reduced significantly by about 760.59 km2,the area of dry land increased by 829.31 km2.During 2000-2007,the area of dry land decreased by 428.80 km2,and that of shrub increased by 206.03 km2.From 1988 to 2007,little change was seen in the area of water,woodland area started to grow,while urban construction land kept an upward trend,it increase in 2000-2007 was obviously faster than in 1988-2000.indicating that the urbanization process of Chongqing was accelerating.