13 May 2017 Evaluation of automated urban surface water extraction from Sentinel-2A imagery using different water indices
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Abstract
Urban surface water is characterized by complex surface continents and small size of water bodies, and the mapping of urban surface water is currently a challenging task. The moderate-resolution remote sensing satellites provide effective ways of monitoring surface water. This study conducts an exploratory evaluation on the performance of the newly available Sentinel-2A multispectral instrument (MSI) imagery for detecting urban surface water. An automatic framework that integrates pixel-level threshold adjustment and object-oriented segmentation is proposed. Based on the automated workflow, different combinations of visible, near infrared, and short-wave infrared bands in Sentinel-2 image via different water indices are first compared. Results show that object-level modified normalized difference water index (MNDWI with band 11) and automated water extraction index are feasible in urban surface water mapping for Sentinel-2 MSI imagery. Moreover, comparative results are obtained utilizing optimal MNDWI from Sentinel-2 and Landsat 8 images, respectively. Consequently, Sentinel-2 MSI achieves the kappa coefficient of 0.92, compared with that of 0.83 from Landsat 8 operational land imager.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Xiucheng Yang, Li Chen, "Evaluation of automated urban surface water extraction from Sentinel-2A imagery using different water indices," Journal of Applied Remote Sensing 11(2), 026016 (13 May 2017). https://doi.org/10.1117/1.JRS.11.026016 . Submission: Received: 20 March 2017; Accepted: 21 April 2017
Received: 20 March 2017; Accepted: 21 April 2017; Published: 13 May 2017
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