测绘地理信息

为探究武汉市土地利用时空变化特征,基于Landsat遥感影像数据,从土地利用动态度、土地利用状态指数两个方面分析了武汉市2000—2019年的土地利用时空变化格局。结果表明:(1)武汉市水域面积直线下降,下降速度较稳定,平均年缩减率为1.76%;而建设用地面积逐年增加,由市中心向四周呈"辐射式"扩张,增速逐渐减缓;(2)耕地和林地的状态指数均表现为先增后减的趋势,都在2005—2010年达到峰值0.4左右;建设用地和水域的状态指数变化整体比较稳定,分别在0.2、-0.2处波动变化,这表明建设用地呈扩张的趋势,而水域则呈缩减的趋势。

In order to explore the spatio-temporal characteristics of land use change in Wuhan,we analyze spatio-temporal pattern of land use change in Wuhan from 2000 to 2019 from two aspects of land use dynamic degree and land use state index by Landsat remote sensing images. The results show that the water area in Wuhan decreases linearly with a relatively stable decline rate,and its average annual reduction rate is 1. 76%.While the construction land area increases year by year with a“radial”expansion from city center to its surrounding areas,and the growth rate gradually slows down. The state indexes of cropland and forest land show a trend of“first increase and then decrease”,reaching the peak value of 0. 4 during the period of2005—2010. The state indexes of construction land and water fluctuate in 0. 2 and-0. 2 respectively. They are stable on the whole,which indicates that the construction land is expanding,while the water area is shrinking.