Validation of Satellite Snow Cover Maps in North America and Norway
Validation of Satellite Snow Cover Maps in North America and Norway
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发表时间：
2002-07
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通讯作者：
D. Hall;R. Solberg;G. Riggs
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作者：
D. Hall;R. Solberg;G. Riggs
自2000年2月以来，美国国家航空航天局(NASA)的地球观测系统中分辨率成像光谱仪(MODIS)已经制作了卫星雪图。全球地图每天以500米的分辨率和1/20度(约5.6公里)的气候模拟网格(CMG)分辨率提供。我们将2001年11月1日至2002年3月21日的8天CMG MODIS合成全球地图和2002年2月26日至3月5日的CMG逐日地图与美国国家海洋和大气管理局(NOAA)交互式多传感器冰雪测绘系统(IMS)25公里北美分辨率地图进行了比较。对于挪威研究地区，根据挪威气象局(挪威气象所)出版的天气测量和AVHRR图像目视解译制作的国家雪图以及陆地卫星ETM+图像与MODIS地图进行了比较。MODIS得到的地图与IMS或MI地图在大多数地区是一致的，然而，地图之间也有重要的不一致之处，特别是当使用8天合成地图时。因此，尽管在使用MODIS每日CMG图时受到云层遮挡的限制，但仍应研究MODIS每日CMG图，而不是8天合成图。
Satellite-derived snow maps from NASA's Earth Observing System Moderate Resolution Imaging Spectroradiometer (MODIS) have been produced since February of 2000. The global maps are available daily at 500-m resolution, and at a climate-modeling grid (CMG) resolution of 1/20 deg (approximately 5.6 km). We compared the 8-day composite CMG MODIS-derived global maps from November 1,2001, through March 21,2002, and daily CMG maps from February 26 - March 5,2002, with National Oceanic and Atmospheric Administration (NOAA) Interactive Multisensor Snow and Ice Mapping System (IMS) 25-km resolution maps for North America. For the Norwegian study area, national snow maps, based on synoptic measurements as well as visual interpretation of AVHRR images, published by the Det Norske Meteorologiske Institutt (Norwegian Meteorological Institute) (MI) maps, as well as Landsat ETM+ images were compared with the MODIS maps. The MODIS-derived maps agreed over most areas with the IMS or MI maps, however, there are important areas of disagreement between the maps, especially when the 8-day composite maps were used. It is concluded that MODIS daily CMG maps should be studied for validation purposes rather than the 8-day composite maps, despite the limitations imposed by cloud obscuration when using the daily maps.