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Comparison of MODIS and Model-Derived Snow-Covered Areas: Impact of Land Use and Solar Illumination Conditions

机译:MODIS和模型衍生的积雪区域的比较:土地利用和太阳能照明条件的影响

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Moderate resolution imaging spectroradiometry (MODIS) snow cover accuracy has been assessed in the past at different scales, with various approaches and in relation to the many factors influencing the remote observation of snow-covered areas (SCA). However, the challenge of fully characterizing MODIS accuracy over forest sites is still open. In this study, we exploit 5 years of data from the upper river Adige basin at Ponte Adige (Eastern Italian Alps) to condition an enhanced temperature index snowpack model accounting for model parameter uncertainty by using the Generalized Likelihood Uncertainty Estimation (GLUE) methodology. The simulated SCA is then compared with MODIS retrievals through a range of different statistical metrics to investigate how land use and solar illumination conditions affect such comparison. In particular, the Overall Accuracy index (OA) is used to quantify the agreement between satellite-derived and simulated SCA on a pixel-by-pixel basis. Analyzing the spatial variability either of the median OA and its range shows that illumination conditions over forested canopies represent a major source of uncertainty in MODIS SCA. Exploiting this finding, we identify the minimum level of incoming short-wave radiation for accurate use of MODIS SCA in forest areas.
机译:在过去的不同尺度的过去评估了适度分辨率的成像光谱辐射测定法(MODIS)雪覆盖精度,具有各种方法,以及影响远程观察冰雪覆盖的区域(SCA)的因素。然而,在森林网站上充分表征Modis准确性的挑战仍然是开放的。在这项研究中,我们利用了5年来,从庞特阿迪(东部意大利阿尔卑斯山)的上河上河上河畔迪里奇盆地数据进行了5年来调节增强的温度指数积雪模型,通过使用广义似然不确定性估计(胶水)方法来解决模型参数不确定性。然后将模拟的SCA与MODIS检索通过一系列不同的统计指标进行比较,以研究土地使用和太阳能照明条件如何影响这种比较。特别地,整体精度索引(OA)用于在像素逐个像素的基础上量化卫星导出和模拟SCA之间的协议。分析中位数和其范围的空间可变性表明,森林檐篷的照明条件代表了Modis SCA的不确定性的主要来源。利用这一发现,我们确定了用于准确使用森林地区MODIS SCA的最低线路短波辐射水平。

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