用气象卫星资料监测积雪的计算方法
（1） 观测数据的定标与订正：
定标公式：
订正公式：
式中，
为各光谱通道观测的物理量；
，
为个各通道的定标系数即斜率与截距；
为
个通道观测的计数值；E为订正后的反射率，
为定标后的反射率；
为观测点的太阳天顶角。
（2） 几何校正公式：
式中，
和
分别为北半球投影图中心点坐标；
为投影图中单位长度可存放的像素点数；
，
和
可根据投影图的分辨率任取；D为投影图中从极点到赤道的距离；
为投影图的主经度；
和
分别为卫星观测点N的地理经纬度。
（3） 积雪阈值：
式中，
和
分别为积雪反射率和亮度温度阈值；
和
为通用阈值；
和
为修正阈值。
参考文献
刘玉洁，袁秀卿，张红：用气象卫星资料监测积雪。环境遥感，1992，7（1）
Satellite positioning system that global positioning system (Global Positioning System), is the use of satellite to accurately locate the technology. Can guarantee at any time, any point on the earth can also observe four satellites in order to achieve navigation, positioning, timing and other functions. Can be used to guide aircraft, ships, vehicles, and individuals, safe and accurate along the selected route, arrived at the destination on time, but also can be applied to mobile phones and other pursuit.
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