MODIS LST产品青藏高原冻土图的精度验证

发布时间：2018-03-09 07:13

本文选题：青藏高原　切入点：LST　出处：《冰川冻土》2017年01期 　论文类型：期刊论文

【摘要】：利用遥感数据可以大大提高青藏高原多年冻土分类和制图效率,并降低在环境恶劣、地形复杂的高寒区域所需的观测要求,从而避免人力和物力的巨大消耗。为了验证基于MODIS LST产品制作的青藏高原冻土图的精度,通过选取青藏高原东部的温泉区域和西北部的西昆仑山地区对1∶400万青藏高原冻土图、1∶300万青藏高原冻土图、基于MODIS LST产品青藏高原冻土图进行综合验证,以此评估基于MODIS LST产品的青藏高原冻土图精度。结果表明,利用遥感数据制作的青藏高原冻土图较已有冻土图能够更好反映多年冻土的空间分布特征,同时存在差异的地方大多是多年冻土与季节冻土过渡的边缘区域,形成原因主要是制图时间差异,此外还有坡度、坡向、植被、积雪等多重因素的综合影响。
[Abstract]:The use of remote sensing data can greatly improve the efficiency of classification and mapping of permafrost over the Qinghai-Xizang Plateau, and reduce the observation requirements in alpine regions with harsh environments and complex topography, In order to verify the accuracy of the frozen soil map of the Qinghai-Tibet Plateau based on MODIS LST products, By selecting the hot spring area in the eastern part of the Qinghai-Tibet Plateau and the western Kunlun Mountains region in the northwest of the Qinghai-Xizang Plateau, the frozen soil map of the Qinghai-Xizang Plateau of 12: 4 million is selected and the frozen soil map of the Qinghai-Xizang Plateau is comprehensively verified based on the MODIS LST product. The accuracy of the frozen soil map of the Qinghai-Xizang Plateau based on MODIS LST products is evaluated. The results show that the frozen soil map based on remote sensing data can better reflect the spatial distribution characteristics of permafrost than the existing permafrost map. At the same time, the difference between permafrost and seasonal frozen soil is the edge of the transition, the main reason is the difference of mapping time, in addition, there are many factors, such as slope, slope direction, vegetation, snow and so on.
【作者单位】：中国科学院大学;中国科学院西北生态环境资源研究院冻土工程国家重点实验室;中国科学院西北生态环境资源研究院黑河遥感试验研究站;
【基金】：国家自然科学基金项目(41271087) 国家科技部973项目(2013CBA01802)资助
【分类号】：P642.14

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