Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat

Forests have significant impacts on the global carbon cycle, hydrological processes, and biodiversity. Driven by socioeconomic developments, forests experienced drastic changes since the mid-20th century in China. Although declassified spy satellite and other Earth observation satellite data offer r...

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Autores principales:	Dan-Xia Song, Chengquan Huang, Tao He, Min Feng, Ainong Li, Sike Li, Yong Pang, Hao Wu, Abdul Rashid Mohamed Shariff, John Townshend
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2021
Materias:	Declassified spy satellite (DSS) forest cover change (FCC) image registration landsat Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809
Acceso en línea:	https://doaj.org/article/b24b552558394044a716cec59f340840
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spelling	oai:doaj.org-article:b24b552558394044a716cec59f3408402021-11-18T00:00:24ZVery Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat2151-153510.1109/JSTARS.2021.3121260https://doaj.org/article/b24b552558394044a716cec59f3408402021-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9580698/https://doaj.org/toc/2151-1535Forests have significant impacts on the global carbon cycle, hydrological processes, and biodiversity. Driven by socioeconomic developments, forests experienced drastic changes since the mid-20th century in China. Although declassified spy satellite and other Earth observation satellite data offer remote sensing technologies for mapping these long-term changes, challenges remain unsolved for applications of large volumes of historical data. This study uses long-term satellite observations, including declassified satellite data in the 1960s and Landsat products since the 1970s to monitor the decadal changes. A semi-automated method was developed for the rapid registration of declassified images with reference to Landsat data. The method was applied to quantify the forest cover (FC) in Sichuan Province (excluding Chongqing), China. Combined with a Landsat-based FC change product, it revealed that the FC in Sichuan declined rapidly by 38% from the 1960s to 2005. The FC was estimated to be 45.19 ± 1.62% in the 1960s and 38.98 ± 2.06% in 1975, but it rapidly decreased to 28.91 ± 2.07% in 1990 and 27.87 ± 2.14% by 2005. Supplemented with the official statistics, the FC in Sichuan was reported to increase to 38.03% by 2018. Although differences between the remote sensing-based estimates and the statistics were observed, they highlight the challenges in reconstructing historical land use changes for carbon and other studies. The drastic loss of forests before 1990 and the stabilizing afterward reflects the changes in forest policies, which transitioned from serving timber products to forest conservations.Dan-Xia SongChengquan HuangTao HeMin FengAinong LiSike LiYong PangHao WuAbdul Rashid Mohamed ShariffJohn TownshendIEEEarticleDeclassified spy satellite (DSS)forest cover change (FCC)image registrationlandsatOcean engineeringTC1501-1800Geophysics. Cosmic physicsQC801-809ENIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Vol 14, Pp 10964-10976 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Declassified spy satellite (DSS) forest cover change (FCC) image registration landsat Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809
spellingShingle	Declassified spy satellite (DSS) forest cover change (FCC) image registration landsat Ocean engineering TC1501-1800 Geophysics. Cosmic physics QC801-809 Dan-Xia Song Chengquan Huang Tao He Min Feng Ainong Li Sike Li Yong Pang Hao Wu Abdul Rashid Mohamed Shariff John Townshend Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat
description	Forests have significant impacts on the global carbon cycle, hydrological processes, and biodiversity. Driven by socioeconomic developments, forests experienced drastic changes since the mid-20th century in China. Although declassified spy satellite and other Earth observation satellite data offer remote sensing technologies for mapping these long-term changes, challenges remain unsolved for applications of large volumes of historical data. This study uses long-term satellite observations, including declassified satellite data in the 1960s and Landsat products since the 1970s to monitor the decadal changes. A semi-automated method was developed for the rapid registration of declassified images with reference to Landsat data. The method was applied to quantify the forest cover (FC) in Sichuan Province (excluding Chongqing), China. Combined with a Landsat-based FC change product, it revealed that the FC in Sichuan declined rapidly by 38% from the 1960s to 2005. The FC was estimated to be 45.19 ± 1.62% in the 1960s and 38.98 ± 2.06% in 1975, but it rapidly decreased to 28.91 ± 2.07% in 1990 and 27.87 ± 2.14% by 2005. Supplemented with the official statistics, the FC in Sichuan was reported to increase to 38.03% by 2018. Although differences between the remote sensing-based estimates and the statistics were observed, they highlight the challenges in reconstructing historical land use changes for carbon and other studies. The drastic loss of forests before 1990 and the stabilizing afterward reflects the changes in forest policies, which transitioned from serving timber products to forest conservations.
format	article
author	Dan-Xia Song Chengquan Huang Tao He Min Feng Ainong Li Sike Li Yong Pang Hao Wu Abdul Rashid Mohamed Shariff John Townshend
author_facet	Dan-Xia Song Chengquan Huang Tao He Min Feng Ainong Li Sike Li Yong Pang Hao Wu Abdul Rashid Mohamed Shariff John Townshend
author_sort	Dan-Xia Song
title	Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat
title_short	Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat
title_full	Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat
title_fullStr	Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat
title_full_unstemmed	Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat
title_sort	very rapid forest cover change in sichuan province, china: 40 years of change using images from declassified spy satellites and landsat
publisher	IEEE
publishDate	2021
url	https://doaj.org/article/b24b552558394044a716cec59f340840
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Very Rapid Forest Cover Change in Sichuan Province, China: 40 Years of Change Using Images From Declassified Spy Satellites and Landsat

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