气候变化领域集成服务门户(CCPortal): Land-cover change in the Caucasus Mountains since 1987 based on the topographic correction of multi-temporal Landsat composites

CCPortal

DOI	10.1016/j.rse.2020.111967
	Land-cover change in the Caucasus Mountains since 1987 based on the topographic correction of multi-temporal Landsat composites
	Buchner J.; Yin H.; Frantz D.; Kuemmerle T.; Askerov E.; Bakuradze T.; Bleyhl B.; Elizbarashvili N.; Komarova A.; Lewińska K.E.; Rizayeva A.; Sayadyan H.; Tan B.; Tepanosyan G.; Zazanashvili N.; Radeloff V.C.
发表日期	2020
ISSN	00344257
卷号	248
英文摘要	Mountainous regions are changing rapidly across the world due to both land-use change and climate change. Given the importance of mountainous regions for ecosystem services and endemic biodiversity, monitoring these changes is essential. Satellite data provide a great resource to map land-cover change in mountainous regions, however mapping is especially challenging there because topographic complexity affects reflectance. The so-called ‘topographic effect’ has been successfully corrected for in case studies of small areas, but a comparison of large-area classifications and land-cover change analyses with and without topographic correction is missing. Here, we performed a long-term land-cover change assessment for a large mountainous region, i.e., the Caucasus Mountains with topographic correction. Our two goals were 1) to examine the effect of topographic correction on land-cover classification for a large mountainous region, and 2) to assess land-cover changes since 1987 across the Caucasus based on the full Landsat archive. Both the complex topography and the history of land-use changes, especially after the collapse of the Soviet Union in 1991, make the Caucasus Mountains an ideal study area to understand topographic effects on large-area land-cover mapping for the last three decades. First, we compared a non-topographically-corrected Landsat classification for 2015 with a classification that was topographically-corrected with an enhanced C-correction for the same year and assessed the accuracy of both. Second, we derived topographically-corrected Landsat classifications for six dates to assess changes in cropland and forest from 1987 to 2015, based on class probabilities and post-classification comparisons. In regard to our first goal, topographic correction improved the overall accuracy of the classification only by 2% (from 79 to 81%), but disagreement rates were as high as 100% in mountainous regions, especially among forest types. In regard to our second goal, we found that cropland loss was the most prevalent change process since 1987. Cropland loss was particularly widespread in Georgia and Armenia until 2000, and in Azerbaijan until 2005. The North Caucasus (the Russian Federation) had more stable cropland over time, most likely due to different land reforms after the collapse of the Soviet Union, and the prevalence of flat landscapes and very fertile soils, which make cultivation easier than in the South Caucasus. Rates of forest change throughout the Caucasus Mountains were surprisingly low, with forest loss and forest gain being roughly equal. Forest loss was most likely related to both illegal logging and natural disturbance, whereas forest gain was most likely due to cropland abandonment and less grazing pressure. Our results highlight both the importance and the feasibility of topographic correction for accurate large-area land-cover classifications in steep terrain. © 2020 Elsevier Inc.
英文关键词	Cropland change; Forest change; Illumination conditions; Land-surface phenology; Large-area mapping
语种	英语
scopus关键词	Biodiversity; Ecosystems; Forestry; Land use; Landforms; Mapping; Topography; Class probabilities; Complex topographies; Land cover classification; Large area classifications; Mountainous regions; Post-classification comparisons; Topographic complexity; Topographic correction; Climate change; accuracy assessment; biodiversity; classification; climate change; composite; ecosystem service; endemic species; land cover; land reform; Landsat; mountain region; satellite data; topography; Armenia [West Asia]; Azerbaijan; Caucasus; Caucasus; Georgia; Northern Caucasus; Northern Caucasus; Russian Federation; United States; USSR
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179201
作者单位	SILVIS Lab, Department of Forest and Wildlife Ecology, University of Wisconsin-Madison, 1630 Linden Drive, Madison, WI 53706, United States; Geography Department, Humboldt University Berlin, Unter den Linden 6, Berlin, 10099, Germany; WWF Azerbaijan, 6th Boyuk Gala dongesi 11, Sabayıl rayon, Baku, 1001, Azerbaijan; Institute of Zoology of Azerbaijan NASBlock 504, pass 1128, A. Abbaszade 13 Str, Baku, Az 1073, Azerbaijan; Institute of Ecology, Ilia State University, 3/5 K. Cholokashvili Ave., Tbilisi, 0162, Georgia; Geographic, GIS & RS Consulting Center, Bulachauri Street 10, Tbilisi, 0260, Georgia; Department of Regional Geography and Landscape Planning, Tbilisi State University, 1 Chavchavadze Avenue, Tbilisi, 0179, Georgia; Greenpeace Russia, Leningradsky prospekt, 26/1, Moscow, 125040, Russian Federation; Baku State University, Department of Bioecology, 23 Z. Khalilov st., Baku, AZ1148, Azerbaijan; Forestry Department, Armenian Agricultural Academy, Teryan 74, Yerevan, 375009, Armenia; NASA Goddard ...
推荐引用方式 GB/T 7714	Buchner J.,Yin H.,Frantz D.,et al. Land-cover change in the Caucasus Mountains since 1987 based on the topographic correction of multi-temporal Landsat composites[J],2020,248.
APA	Buchner J..,Yin H..,Frantz D..,Kuemmerle T..,Askerov E..,...&Radeloff V.C..(2020).Land-cover change in the Caucasus Mountains since 1987 based on the topographic correction of multi-temporal Landsat composites.Remote Sensing of Environment,248.
MLA	Buchner J.,et al."Land-cover change in the Caucasus Mountains since 1987 based on the topographic correction of multi-temporal Landsat composites".Remote Sensing of Environment 248(2020).