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Remote Sens. 2017, 9(3), 249;

Mapping Urban Bare Land Automatically from Landsat Imagery with a Simple Index

State Key Laboratory of Geological Process and Mineral Resource, Planetary Research Institute, School of Earth Science, China University of Geosciences, Wuhan 430074, China
Key Laboratory of Agri-Informatics, Ministry of Agriculture, Beijing 100084, China
Department of Geography, University of South Carolina, 709 Bull St., Columbia, SC 29208, USA
Three Gorges Research Center for Geo-Hazard, Ministry of Education, University of Geosciences, Wuhan 430074, China
Author to whom correspondence should be addressed.
Academic Editors: Soe Myint, Magaly Koch and Prasad S. Thenkabail
Received: 19 November 2016 / Accepted: 28 February 2017 / Published: 7 March 2017
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In recent years, hundreds of Earth observation satellites have been launched to collect massive amounts of remote sensing images. However, the considerable cost and time to process the significant amount of data have become the greatest obstacle between data and knowledge. In order to accelerate the transformation from remote sensing images to urban thematic maps, a strategy to map the bare land automatically from Landsat imagery was developed and assessed in this study. First, a normalized difference bare land index (NBLI) was presented to maximally differentiate bare land from other land types in Wuhan City, China. Then, an unsupervised classifier was employed to extract the bare land from the NBLI image without training samples or self-assigned thresholds. Experimental results showed good performance on overall accuracy (92%), kappa coefficient (0.84), area ratio (1.1321), and match rate (83.96%), respectively. Results in multiple years disclosed that bare lands in the study site gradually moved from inner loops to the outer loops since 2007, in two main directions. This study demonstrated that the proposed method was an accurate and reliable option to extract the bare land, which led to a promising approach to mapping urban land use/land cover (LULC) automatically with simple indices. View Full-Text
Keywords: Landsat imagery; the bare land; automatic mapping; spatial-temporal change; LULC Landsat imagery; the bare land; automatic mapping; spatial-temporal change; LULC

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, H.; Wang, C.; Zhong, C.; Su, A.; Xiong, C.; Wang, J.; Liu, J. Mapping Urban Bare Land Automatically from Landsat Imagery with a Simple Index. Remote Sens. 2017, 9, 249.

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