随着城市化进程不断加快,长沙市区景观变化逐步增强.以长沙市区为研究对象,采用遥感和地理信息系统技术,以1980至2007年间的遥感影像为基础,获取不同年代长沙市区景观变化信息,应用转移矩阵方法和Kappa指数对长沙市景观动态变化进行分析.结果表明:1980~1995和1995~2000期间,土地类型之间转换较慢,景观变化不显著,但是2000~2007期间,土地类型之间转换速度加快,景观变化明显加快;1980至2007年建成区面积一直处于增长趋势,其中2000年至2007年面积增幅最大,增长了55.3248km^2,总面积达到175.4208km^2;城市扩展强度变大,扩展速度加快,且景观类型间相互转换频繁:面积最大的景观类型1980年为耕地,而2007年变为城镇用地;景观格局逐渐向脆弱化的方向发展趋势,Kappa指数系列计算结果表明,空间位置变化逐步剧烈.1980~2000年标准Kappa和随机Kappa几乎没有发生变化,均在0.93以上。2000~2007年则分别降为0.6949、0.7411.
With the accelerating process of urbanization, Changsha urban landscape change gradually increases. Based on remote sensing and GIS technology, the images of remote sensing from 1980 to 2007 were used to the basis of the data source, to obtain different information about Changsha urban landscape change, the dynamic landscape analysis was applied by the transfer matrix method and Kappa index of Changsha. The results show that: in the period of 1980-1995 and 1995-2000,the conversion between the types of land was slow, landscape change was not obvious, and from 2000 to 2007 the conversion of the types was faster and the landscape change were significantly speed up; from 1980 to 2007 inter-city area has been in a growth trend, from 2000 to 2007 is the biggest area of growth and increased 55. 324 8 km^2 ,total area reached to 175. 420 8 km^2; strength of the expansion of urban, the pace of expansion was accelerated, and the type of landscape were frequently converted mutually: the biggest area was infield in 1980 and urban area in 2007 ; The landscape pattern of development trends was increasingly vulnerable, and the results of the Kappa index series show that the location of the space was dramatically changed, from 1980 to 2000 standard Kappa and random Kappa had few changed and more than 0. 93,but they respectively were 0. 694 9 and 0. 741 1.