Remote sensing study of urban spatial expansion in Kashgar City based on multisource and multi temporal datasets in the last 70 years
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 trans-ferred to the southeast of the oasis hinderland about 1 009 m,and covered a great deal of farming land.Howev-er,the extensive mode of urban spatial growth must be adjusted and regulated.
Kashgar CityCORONAspatial expansionequal fan analysis methodbarycenter transition matrix