基于多源多时相数据集的喀什市近70a城区空间扩展遥感研究

Remote sensing study of urban spatial expansion in Kashgar City based on multisource and multi temporal datasets in the last 70 years

使用民国34年(1945年)1∶1×104地形图、1968年CORONA影像及近期Landsat5和2015年GE影像数据,使用遥感技术以多元多时相遥感数据融合和GIS挖掘技术为支撑,采用等扇分析法和重心转移矩阵分析了喀什市70 a城市空间形态整体扩展特征,各方向上的扩展速度、强度以及空间重心转移的方向、强度.结果表明:1945-2015年间喀什市空间形态经历了带状扩展向团状扩展的转变,城市整体空间扩展强度不断加剧,空间扩展速度呈先上升后下降再上升的趋势,空间重心向东南方向绿洲腹地转移1 009 m,侵占甚多绿洲耕地,城市空间扩展模式粗放,亟待调整.

Based on 1： 10000 topographic map（ 1945）,CORONA（ 1968） and Landsat5（ 2015） image data,the overall expansion characteristics of urban spatial form,the expansion speed and intensity in each direction,as well as direction and intensity of spatial barycenter transition of Kashgar City over the past 70 years are analyzed.The analysis has been supported by multisource remote sensing image data fusion and mining technology of GIS.The equal fan analysis method and barycenter transition matrix have been applied in this paper. The results show that：（ 1） The spatial pattern of Kashgar City had changed from banded extension to round extension during the period of 1945-2015;（ 2） the strength of the overall urban space extension has increased constantly; and（ 3）the space extension speed experiences rising,falling and going up again,and the spatial barycenter has transferred to the southeast of the oasis hinderland about 1 009 m,and covered a great deal of farming land. However,the extensive mode of urban spatial growth must be adjusted and regulated.