Primary Experiments of Detecting Snow and Ice by Using Himawari-8 Imagery
作者: 周鉴本 ：“中央气象局”气象卫星中心，台湾 台北;
Abstract: The normalized difference snow index (NDSI) has been used to detect sea ice and snow cover on the Earth. NDSI is calculated by using channel 0.51 μm and 1.6 μm on board geostationary satellite Himawari-8. The pixel is defined as ice/snow when the value of NDSI is higher than 0.6. However, the value of NDSI is higher than 0.6 for some type of cloud either. A primary type of this cloud is the thick cloud with ice top. In order to distinguish this type of cloud, following tests have been adopted to achieve this goal. First, we use the value of 1.6 μm minus 2.3 μm albedo as a parameter to distinguish between the ice/snow on Earth surface and the thick cloud with ice top because we found that the value of 1.6 μm minus 2.3 μm is positive for ice/snow on Earth’s surface and negative for thick cloud with ice top. Second, the pixel is not considered as ice/snow on Earth’s surface when the value of 7.3 μm minus 6.2 μm is smaller than a setting threshold. Third, the pixel did not define as ice/snow on surface of Earth if the value of 10.4 μm minus 6.2 μm is smaller than a setting threshold. The second and third tests are able to remove thick cloud with ice top by the fact that top of this kind cloud is higher than snow/ice on the Earth. Comparison of ice/snow map from NDSI with tests to snow-fog RGB image shows a relevant consistency between them.
文章引用: 周鉴本 (2016) 以向日葵8号卫星观测侦测冰雪的初步实验。 地球科学前沿， 6， 432-442. doi: 10.12677/AG.2016.65045
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