Journal
INTERNATIONAL JOURNAL OF DIGITAL EARTH
Volume 9, Issue 10, Pages 1004-1020Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17538947.2016.1168879
Keywords
Urban built-up areas; VIIRS; MODIS; nighttime light; Urban Built-up Index; global mapping
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An improved methodology for the extraction and mapping of urban built-up areas at a global scale is presented in this study. The Moderate Resolution Imaging Spectroradiometer ( MODIS)-based multispectral data were combined with the Visible Infrared Imager Radiometer Suite ( VIIRS)-based nighttime light ( NTL) data for robust extraction and mapping of urban built-up areas. The MODIS-based newly proposed Urban Built-up Index ( UBI) was combined with NTL data, and the resulting Enhanced UBI ( EUBI) was used as a single master image for global extraction of urban built-up areas. Due to higher variation of the EUBI with respect to geographical regions, a region-specific threshold approach was used to extract urban built-up areas. This research provided 500-m-resolution global urban built-up map of year 2014. The resulted map was compared with three existing moderate-resolution global maps and one high-resolution map in the United States. The comparative analysis demonstrated finer details of the urban built-up cover estimated by the resultant map.
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