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A study of remote sensing monitoring and spatial variation of construction land expansion in Wuhan City |
| CHANG Bianrong1, 2, LI Rendong1 |
1. Institute of Geodesy and Geophysics, Chinese Academy of Science, Wuhan 430077, China;
2. Tianjin Agricultural University, Tianjin 300384, China |
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Abstract In order to analyze the spatial-temporal variations of construction land expansion in Wuhan City, the authors obtained construction land data by using object-oriented classification method based on Landsat data acquired in 1990, 2000, 2005 and 2010. Urban expansion indices, which included expansion speed index (ESI), expansion intensity index(EII) and integrated expansion degree index (EDI), were used to quantitatively analyze temporal variations of construction expansion. And standard deviational ellipse(SDE)method was employed to investigate the spatial dynamics. The results show that the area of construction land in Wuhan City increased continuously, with a total increase of 749.9 km2 in two decades. The proportion of construction land expansion in earlier ten years, middle five years and later five years was 19.06%, 33.33% and 47.61%, respectively. The values of ESI and EII tended to increase, and the expansion degree was especially strong during 2005―2010 period. The spatial distribution of the construction land was discrete. Construction land partially extended in the earlier decade and tended to expand evenly in the middle five years. And the distribution of the construction land in the two periods exhibited a spatial pattern “spanning northeast to southwest”. In the later five years, construction land expansion was balanced in every direction with no directivity. This study may provide decision support for the rational expansion of construction land in Wuhan City.
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| Keywords
variable scale
Mean-Shift
cropland segmentation
high spatial resolution remote sensing image
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Issue Date: 15 August 2017
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2017,
Vol. 29
