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A Validation of MODIS Snowcover Products in Romania: Challenges and Future Directions

机译：罗马尼亚MODIS积雪产品的验证：挑战和未来方向

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摘要

The MODIS snowcover product is one of many geophysical products derived from MODIS data. A cross-validation of the MODIS snowcover daily products with data obtained from the meteorological network stations was conducted for the entire territory of Romania. The validation time interval covered the period between 29 October, 2004 and 1 May, 2005. The overall accuracy for the whole set of cloud-free useful data proved to be 95%. The validation time interval included the three common snow situations: (1) late autumn months where 37.1% of the initial set of the data was used, and the overall accuracy was 98.6%; (2) the "winter" months where the clouds reduced the set of useful data – 31.75% – and the overall accuracy was 93.7%; and (3) the months of February and March which returned the highest accuracy (> 95%). Additionally, a cross-validation using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) high-resolution imagery was carried out. Furthermore, the MODIS, meteorological data and ASTER data were integrated into a Geographic Information System (GIS) environment to perform flexible and comprehensive cross-checking followed by a thematic analysis based on additional sets of data such as digital elevation models (DEMs) and land-cover datasets.
机译：MODIS积雪产品是源自MODIS数据的众多地球物理产品之一。对罗马尼亚整个领土的MODIS积雪日常产品与从气象站获得的数据进行了交叉验证。验证时间间隔为2004年10月29日至2005年5月1日之间。整个无云有用数据集的整体准确性为95％。验证时间间隔包括三种常见的降雪情况：（1）深秋月份，使用初始数据集的37.1％，总准确度为98.6％; （2）在“冬季”月份，云减少了有用的数据集– 31.75％–总体准确性为93.7％; （3）2月和3月返回的准确度最高（> 95％）。此外，还使用高级星载热发射和反射辐射计（ASTER）高分辨率图像进行了交叉验证。此外，将MODIS，气象数据和ASTER数据集成到地理信息系统（GIS）环境中，以进行灵活，全面的交叉检查，然后基于数字高程模型（DEM）和土地等其他数据集进行主题分析。 -覆盖数据集。

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