Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80467
Title: Automatic classification of major urban land covers based on novel spectral indices
Authors: Faridatul, MI 
Wu, B 
Keywords: Terrestrial ecosystem
Land cover
Classification
Spectral indices
Issue Date: 2018
Publisher: Molecular Diversity Preservation International (MDPI)
Source: ISPRS international journal of geo-information, Dec. 2018, v. 7, no. 12, 453, p. 1-25 How to cite?
Journal: ISPRS international journal of geo-information 
Abstract: Urban land cover classification and mapping is an important and ongoing research field in monitoring and managing urban sprawl and terrestrial ecosystems. The changes in land cover largely affect the terrestrial ecosystem, thus information on land cover is important for understanding the ecological environment. Quantification of land cover in urban areas is challenging due to their diversified activities and large spatial and temporal variations. To improve urban land cover classification and mapping, this study presents three new spectral indices and an automated approach to classifying four major urban land types: impervious, bare land, vegetation, and water. A modified normalized difference bare-land index (MNDBI) is proposed to enhance the separation of impervious and bare land. A tasseled cap water and vegetation index (TCWVI) is proposed to enhance the detection of vegetation and water areas. A shadow index (ShDI) is proposed to further improve water detection by separating water from shadows. An approach for optimizing the thresholds of the new indices is also developed. Finally, the optimized thresholds are used to classify land covers using a decision tree algorithm. Using Landsat-8 Operational Land Imager (OLI) data from two study sites (Hong Kong and Dhaka City, Bangladesh) with different urban characteristics, the proposed approach is systematically evaluated. Spectral separability analysis of the new indices is performed and compared with other common indices. The urban land cover classifications achieved by the proposed approach are compared with those of the classic support vector machine (SVM) algorithm. The proposed approach achieves an overall classification accuracy of 94-96%, which is superior to the accuracy of the SVM algorithm.
URI: http://hdl.handle.net/10397/80467
EISSN: 2220-9964
DOI: 10.3390/ijgi7120453
Rights: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The following publication Faridatul, M. I., & Wu, B. (2018). Automatic classification of major urban land covers based on novel spectral indices. Isprs International Journal of Geo-Information, 7(12), 453, 1-25 is available at https://dx.doi.org/10.3390/ijgi7120453
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