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Title: iSEAM : improving the blooming effect adjustment for DMSP-OLS nighttime light images by considering spatial heterogeneity of blooming distance
Authors: Zhuo, L
Zhang, C
Zhu, X 
Huang, T
Hu, Y
Tao, H
Issue Date: 2021
Source: IEEE journal of selected topics in applied earth observations and remote sensing, 2021, v. 14, 9376097, p. 3903-3913
Abstract: The longest archive makes DMSP-OLS nighttime light (NTL) images unparalleled in relevant time series studies. However, these studies have been constrained by the blooming effect. The self-adjusting model (SEAM) proposed in 2019 solves this problem to some extent. However, SEAM assumed all pixels in NTL images with a constant blooming distance 3.5 km. In fact, the blooming distance is related to the land covers and the brightness of artificial lights. This assumption leads to large errors in cities that have blooming distance different from 3.5 km. To address this problem, this study proposed an improved SEAM model (iSEAM) by considering spatial heterogeneity of blooming distance. Specifically, iSEAM segmented the DMSP-OLS image to obtain light objects and then employed the random forest method to estimate the effective blooming distance for each light object, and then corrected the blooming effect of all pixels in each light object by a modified pixel brightness interactive model. The test in China shows that the blooming distance ranges from 0 to 12.55 km in China, with an average 3.36 km. The correlation coefficient (R) between the images corrected by iSEAM and the NPP-VIIRS images reaches 0.70 that is higher than other blooming effect correction methods. Moreover, the corrected images by iSEAM have higher spatial heterogeneity than other methods. These results suggest that by considering the spatial heterogeneity of effective blooming distance, iSEAM can serve as a more accurate and effective method to correct the blooming effect of DMSP-OLS NTL images.
Keywords: Blooming effect
DMSP-OLS
Nighttime light images
Pixel brightness interactive model
Spatial heterogeneity
Publisher: Institute of Electrical and Electronics Engineers
Journal: IEEE journal of selected topics in applied earth observations and remote sensing 
ISSN: 1939-1404
EISSN: 2151-1535
DOI: 10.1109/JSTARS.2021.3065399
Rights: This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. For more information, see https://creativecommons.org/licenses/by-nc-nd/4.0/
The following publication Zhuo, L., Zhang, C., Zhu, X., Huang, T., Hu, Y., & Tao, H. (2021). iSEAM: Improving the Blooming Effect Adjustment for DMSP-OLS Nighttime Light Images by Considering Spatial Heterogeneity of Blooming Distance. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 14:9376097, 3903-3913 is available at https://doi.org/10.1109/JSTARS.2021.3065399
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