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Evaluation of remotely sensed snow cover product in Central Asia

机译:中亚遥感积雪产品评估

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摘要

Central Asian countries depend highly on water resources from snow and glacier melt, which has to be studied thoroughly to estimate water availability. However, the observation network in Central Asia is poor to carry out such studies in detail. Observations from space using remote sensing techniques might fill this observation gap, which needs to be validated. Therefore, this study evaluates the Moderate Resolution Imaging Spectroradiometer (MODIS) daily snow cover product in Central Asia. For the evaluation, in situ snow depth data from 30 meteorological stations and higher resolution Landsat data are used. The results show an overall snow agreement between MODIS and ground observations of 93.1 and 92.7% for MODIS Terra and MODIS Aqua snow products, respectively. The agreement between MODIS and Landsat is 91.9% when considering snow and land agreements. The snow fraction product from MODIS is also validated using Landsat data, and varying accuracies are obtained. The main disadvantage of the MODIS snow cover product are the cloud induced gaps. Therefore, cloud covered pixels are eliminated using the ModSnow algorithm, Using the in situ data, the snow agreement of cloud removed snow cover data is checked, and an accuracy of 84.4% is achieved.
机译:中亚国家高度依赖于积雪和冰川融化产生的水资源,必须对其进行深入研究以估计水的可利用量。但是,中亚的观测网络很难开展此类研究。使用遥感技术从太空进行的观测可能会填补这一观测空白,需要加以验证。因此,本研究评估了中亚的中分辨率成像光谱仪(MODIS)日常积雪产品。为了进行评估,使用了来自30个气象站的原地雪深数据和更高分辨率的Landsat数据。结果表明,MODIS与地面观测的整体降雪一致性为MODIS Terra和MODIS Aqua降雪产品,分别为93.1和92.7%。考虑降雪和土地协议时,MODIS与Landsat之间的协议为91.9%。还使用Landsat数据验证了来自MODIS的积雪部分产品,并获得了不同的精度。 MODIS积雪产品的主要缺点是云引起的空隙。因此,使用ModSnow算法消除了被云覆盖的像素,使用原位数据检查了被云去除的被雪覆盖数据的降雪一致性,达到了84.4%的精度。

著录项

  • 来源
    《Nordic hydrology》 |2013年第3期|506-522|共17页
  • 作者单位

    Deutsches GeoForschungszentrum GFZ,Section 5.4: Hydrology,Potsdam,Germany;

    Deutsches GeoForschungszentrum GFZ,Section 5.4: Hydrology,Potsdam,Germany;

    Deutsches GeoForschungszentrum GFZ,Section 5.4: Hydrology,Potsdam,Germany;

    Deutsches GeoForschungszentrum GFZ,Section 5.4: Hydrology,Potsdam,Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Central Asia; evaluation; Landsat; remote sensing; snow cover;

    机译:中亚;评估;陆地卫星遥感;雪盖;

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