A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data
In this paper, we introduced a new algorithm for retrieving aerosol optical depth (AOD) over land, from the Cloud and Aerosol Imager (CAI), which is one of the instruments on the Greenhouse Gases Observing Satellite (GOSAT) for detecting and correcting cloud and aerosol interference. We used the GOS...
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ftmdpi:oai:mdpi.com:/2072-4292/8/12/998/ 2023-08-20T03:59:12+02:00 A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data Guosheng Zhong Xiufeng Wang Hiroshi Tani Meng Guo Anthony Chittenden Shuai Yin Zhongyi Sun Shinji Matsumura agris 2016-12-07 application/pdf https://doi.org/10.3390/rs8120998 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/rs8120998 https://creativecommons.org/licenses/by/4.0/ Remote Sensing; Volume 8; Issue 12; Pages: 998 AOD retrieval GOSAT CAI Modified AFRI 1.6 algorithm surface reflectance Text 2016 ftmdpi https://doi.org/10.3390/rs8120998 2023-07-31T21:00:15Z In this paper, we introduced a new algorithm for retrieving aerosol optical depth (AOD) over land, from the Cloud and Aerosol Imager (CAI), which is one of the instruments on the Greenhouse Gases Observing Satellite (GOSAT) for detecting and correcting cloud and aerosol interference. We used the GOSAT and AErosol RObotic NETwork (AERONET) collocated data from different regions over the globe to analyze the relationship between the top-of-atmosphere (TOA) reflectance in the shortwave infrared (1.6 μm) band and the surface reflectance in the red (0.67 μm) band. Our results confirmed that the relationships between the surface reflectance at 0.67 μm and TOA reflectance at 1.6 μm are not constant for different surface conditions. Under low AOD conditions (AOD at 0.55 μm < 0.1), a Normalized Difference Vegetation Index (NDVI) based regression function for estimating the surface reflectance of 0.67 μm band from the 1.6 μm band was summarized, and it achieved good performance, proving that the reflectance relations of the 0.67 μm and 1.6 μm bands are typically vegetation dependent. Since the NDVI itself is easily affected by aerosols, we combined the advantages of the Aerosol Free Vegetation Index (AFRI), which is aerosol resistant and highly correlated with regular NDVI, with our regression function, which can preserve the various correlations of 0.67 μm and 1.6 μm bands for different surface types, and developed a new surface reflectance and aerosol-free NDVI estimation algorithm, which we named the Modified AFRI1.6 algorithm. This algorithm was applied to AOD retrieval, and the validation results for our algorithm show that the retrieved AOD has a consistent relationship with AERONET measurements, with a correlation coefficient of 0.912, and approximately 67.7% of the AOD retrieved data were within the expected error range (± 0.1 ± 0.15AOD(AERONET)). Text Aerosol Robotic Network MDPI Open Access Publishing Remote Sensing 8 12 998 |
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MDPI Open Access Publishing |
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ftmdpi |
language |
English |
topic |
AOD retrieval GOSAT CAI Modified AFRI 1.6 algorithm surface reflectance |
spellingShingle |
AOD retrieval GOSAT CAI Modified AFRI 1.6 algorithm surface reflectance Guosheng Zhong Xiufeng Wang Hiroshi Tani Meng Guo Anthony Chittenden Shuai Yin Zhongyi Sun Shinji Matsumura A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data |
topic_facet |
AOD retrieval GOSAT CAI Modified AFRI 1.6 algorithm surface reflectance |
description |
In this paper, we introduced a new algorithm for retrieving aerosol optical depth (AOD) over land, from the Cloud and Aerosol Imager (CAI), which is one of the instruments on the Greenhouse Gases Observing Satellite (GOSAT) for detecting and correcting cloud and aerosol interference. We used the GOSAT and AErosol RObotic NETwork (AERONET) collocated data from different regions over the globe to analyze the relationship between the top-of-atmosphere (TOA) reflectance in the shortwave infrared (1.6 μm) band and the surface reflectance in the red (0.67 μm) band. Our results confirmed that the relationships between the surface reflectance at 0.67 μm and TOA reflectance at 1.6 μm are not constant for different surface conditions. Under low AOD conditions (AOD at 0.55 μm < 0.1), a Normalized Difference Vegetation Index (NDVI) based regression function for estimating the surface reflectance of 0.67 μm band from the 1.6 μm band was summarized, and it achieved good performance, proving that the reflectance relations of the 0.67 μm and 1.6 μm bands are typically vegetation dependent. Since the NDVI itself is easily affected by aerosols, we combined the advantages of the Aerosol Free Vegetation Index (AFRI), which is aerosol resistant and highly correlated with regular NDVI, with our regression function, which can preserve the various correlations of 0.67 μm and 1.6 μm bands for different surface types, and developed a new surface reflectance and aerosol-free NDVI estimation algorithm, which we named the Modified AFRI1.6 algorithm. This algorithm was applied to AOD retrieval, and the validation results for our algorithm show that the retrieved AOD has a consistent relationship with AERONET measurements, with a correlation coefficient of 0.912, and approximately 67.7% of the AOD retrieved data were within the expected error range (± 0.1 ± 0.15AOD(AERONET)). |
format |
Text |
author |
Guosheng Zhong Xiufeng Wang Hiroshi Tani Meng Guo Anthony Chittenden Shuai Yin Zhongyi Sun Shinji Matsumura |
author_facet |
Guosheng Zhong Xiufeng Wang Hiroshi Tani Meng Guo Anthony Chittenden Shuai Yin Zhongyi Sun Shinji Matsumura |
author_sort |
Guosheng Zhong |
title |
A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data |
title_short |
A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data |
title_full |
A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data |
title_fullStr |
A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data |
title_full_unstemmed |
A Modified Aerosol Free Vegetation Index Algorithm for Aerosol Optical Depth Retrieval Using GOSAT TANSO-CAI Data |
title_sort |
modified aerosol free vegetation index algorithm for aerosol optical depth retrieval using gosat tanso-cai data |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2016 |
url |
https://doi.org/10.3390/rs8120998 |
op_coverage |
agris |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
Remote Sensing; Volume 8; Issue 12; Pages: 998 |
op_relation |
https://dx.doi.org/10.3390/rs8120998 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs8120998 |
container_title |
Remote Sensing |
container_volume |
8 |
container_issue |
12 |
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998 |
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