DOI: 10.1016/j.jag.2013.05.010
Scopus记录号: 2-s2.0-84897574518
论文题名: The fragmented nature of tundra landscape
作者: Virtanen T ; , Ek M
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2014
卷: 27, 期: PARTA 起始页码: 4
结束页码: 12
语种: 英语
英文关键词: Arctic
; Aster
; Bird
; Land cover classification
; Landsata
; Landscape structure
; Quick
Scopus关键词: accuracy assessment
; ASTER
; biome
; image resolution
; land cover
; Landsat
; landscape
; pixel
; QuickBird
; satellite imagery
; spatial distribution
; tundra
; vegetation cover
; vegetation type
; Arctic
; Russian Federation
; Aves
英文摘要: The vegetation and land cover structure of tundra areas is fragmented when compared to other biomes. Thus, satellite images of high resolution are required for producing land cover classifications, in order toreveal the actual distribution of land cover types across these large and remote areas. We produced andcompared different land cover classifications using three satellite images (QuickBird, Aster and LandsatTM5) with different pixel sizes (2.4 m, 15 m and 30 m pixel size, respectively). The study area, in north-eastern European Russia, was visited in July 2007 to obtain ground reference data. The QuickBird imagewas classified using supervised segmentation techniques, while the Aster and Landsat TM5 images wereclassified using a pixel-based supervised classification method. The QuickBird classification showed thehighest accuracy when tested against field data, while the Aster image was generally more problematicto classify than the Landsat TM5 image. Use of smaller pixel sized images distinguished much greaterlevels of landscape fragmentation. The overall mean patch sizes in the QuickBird, Aster, and Landsat TM5-classifications were 871 m2, 2141 m2and 7433 m2, respectively. In the QuickBird classification, the meanpatch size of all the tundra and peatland vegetation classes was smaller than one pixel of the Landsat TM5image. Water bodies and fens in particular occur in the landscape in small or elongated patches, and thuscannot be realistically classified from larger pixel sized images. Land cover patterns vary considerably atsuch a fine-scale, so that a lot of information is lost if only medium resolution satellite images are used. Itis crucial to know the amount and spatial distribution of different vegetation types in arctic landscapes,as carbon dynamics and other climate related physical, geological and biological processes are known tovary greatly between vegetation types. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79697
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, University of Helsinki, P.O. Box 65, Helsinki 00014, Finland
Recommended Citation:
Virtanen T,, Ek M. The fragmented nature of tundra landscape[J]. International Journal of Applied Earth Observation and Geoinformation,2014-01-01,27(PARTA)