MODIS snow-cover products
MODIS snow-cover products
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DOI：
10.1016/s0034-4257(02)00095-0
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发表时间：
2002-11-01
影响因子：
13.5
通讯作者：
Bayr, KJ
中科院分区：
文献类型：
--
作者：
Hall, DK;Riggs, GA;Bayr, KJ
1999年12月18日，Terra卫星发射升空，卫星上有五个仪器，包括中分辨率成像光谱仪（MODIS）。许多地球物理产品都来自中分辨率成像分光仪数据，包括全球积雪产品。自2000年9月13日起，国家冰雪数据中心（NSIDC）的分布式活动档案中心（DAAC）提供了MODIS冰雪产品。中分辨率成像分光仪雪盖产品是对现有业务产品的潜在改进或增强，主要是因为中分辨率成像分光仪产品是全球性的，分辨率为500米，并有能力分离大部分雪和云。中分辨率成像分光仪的雪景制图算法是自动化的，这意味着可以为需要雪盖信息的长期气候研究生成一致的数据集。广泛的质量保证（QA）信息与产品一起存储。中分辨率成像光谱仪雪产品套件开始与500米的分辨率，2330公里的条带积雪覆盖地图，然后网格化的正弦网格，以产生每日和8天的复合瓷砖产品。该序列继续进行到0.05度分辨率的气候模拟网格（CMG）产品，包括每日和8天的合成产品。每日CMG的每个像素包含从40%到100%的积雪覆盖率。CMG中佣金的测量误差很低，例如，在澳大利亚大陆的春季，它们从0.02%到0.10%不等。近期的增强措施包括每日降雪量和部分积雪。从2000年3月6日的案例研究，涉及MODIS数据和现场和飞机测量，显示一些早期的验证工作。(C)2002年爱思唯尔科技有限公司All rights reserved.
On December 18, 1999, the Terra satellite was launched with a complement of five instruments including the Moderate Resolution Imaging Spectroradiometer (MODIS). Many geophysical products are derived from MODIS data including global snow-cover products. MODIS snow and ice products have been available through the National Snow and Ice Data Center (NSIDC) Distributed Active Archive Center (DAAC) since September 13, 2000. MODIS snow-cover products represent potential improvement to or enhancement of the currently available operational products mainly because the MODIS products are global and 500-m resolution, and have the capability to separate most snow and clouds. The MODIS snow-mapping algorithms are automated, which means that a consistent data set may be generated for long-term climate studies that require snow-cover information. Extensive quality assurance (QA) information is stored with the products.. The MODIS snow product suite begins with a 500-m resolution, 2330-km swath snow-cover map, which is then gridded to an integerized sinusoidal grid to produce daily and 8-day composite tile products. The sequence proceeds to a climate-modeling grid (CMG) product at 0.05degrees resolution, with both daily and 8-day composite products. Each pixel of the daily CMG contains fraction of snow cover from 40% to 100%. Measured errors of commission in the CMG are low, for example, on the continent of Australia in the spring, they vary from 0.02% to 0.10%. Near-term enhancements include daily snow albedo and fractional snow cover. A case study from March 6, 2000, involving MODIS data and field and aircraft measurements, is presented to show some early validation work. (C) 2002 Elsevier Science Inc. All rights reserved.