Multi-temporal image analysis of historical aerial photographs and recent satellite imagery reveals evolution of water body surface area and polygonal terrain morphology in Kobuk Valley National Park, Alaska
Multi-temporal image analysis of historical aerial photographs and recent satellite imagery reveals evolution of water body surface area and polygonal terrain morphology in Kobuk Valley National Park, Alaska
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对历史航空照片和最新卫星图像的多时相图像分析揭示了阿拉斯加科伯克谷国家公园水体表面积和多边形地形形态的演变
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发表时间：
2013
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影响因子：
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通讯作者：
S. Stothoff
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作者：
M. Necsoiu;C. Dinwiddie;G. R. Walter;A. Larsen;S. Stothoff
对阿拉斯加科巴克谷国家公园Ahnewetut湿地的甚高分辨率历史航空和近期卫星图像进行的多时相图像分析揭示了融化湖的性质和记录期间两个27年间隔(1951-1978年和1978-2005年)的多边地形演变。利用基于活动等高线的变化检测、高精度正射纠正和联合配准以及归一化差异指数，量化了22个面积从0.09到179公顷的浅水体的表面积膨胀和收缩，以及冰楔多边形从低中心形态到高中心形态的转变。总表面积在第一时间间隔内仅减少0.4%，但在第二时间间隔内减少5.5%。有12个水体(10个湖泊和2个池塘)比较稳定，净表面积下降了≤10%，其中4个湖泊在两个时段都增加了面积，而10个水体(5个湖泊和5个池塘)的表面积损失超过10%，包括2个完全排水的池塘。多边形地形在第一时间间隔内保持相对稳定，但在第二时间间隔内，多边形从低中心向高中心的转变显著。
Multi-temporal image analysis of very-high-resolution historical aerial and recent satellite imagery of the Ahnewetut Wetlands in Kobuk Valley National Park, Alaska, revealed the nature of thaw lake and polygonal terrain evolution over a 54-year period of record comprising two 27-year intervals (1951–1978, 1978–2005). Using active-contouring-based change detection, high-precision orthorectification and co-registration and the normalized difference index, surface area expansion and contraction of 22 shallow water bodies, ranging in size from 0.09 to 179 ha, and the transition of ice-wedge polygons from a low- to a high-centered morphology were quantified. Total surface area decreased by only 0.4% during the first time interval, but decreased by 5.5% during the second time interval. Twelve water bodies (ten lakes and two ponds) were relatively stable with net surface area decreases of ≤10%, including four lakes that gained area during both time intervals, whereas ten water bodies (five lakes and five ponds) had surface area losses in excess of 10%, including two ponds that drained completely. Polygonal terrain remained relatively stable during the first time interval, but transformation of polygons from low- to high-centered was significant during the second time interval.