6SV参数输入.doc

参考源码中的 “main.f” 介绍 6S可以用来预测0.25~4.0μm间无云大气条件下传感器接收到的辐射。考虑了water vapor, carbon dioxyde, oxygen and ozone的吸收作用，molecules and aerosols的散射作用。不均匀地表、二向反射影响也得到了考虑。 总体需要以下参数输入： 几何关系 大气模型用于描述大气成分 气溶胶类型 光谱条件 地表反射（类型与光谱差异） 用户可以选择标准类型，也可以自定义数据。 参数有效范围 geometrical parameters atmospheric model aerosol model the visibility must be better than 5.0km for smaller values alculations might be no more valid. Spectral conditions the gaseous transmittance and the scattering funtions are valid from 0.25 to 4.0 micron. but the treatment of interaction between absorption and scattering is correct for not too large absorption. if you want too compute signal within absorption bands, this interaction ought to be reconsidered ground reflectance (type) you can consider a patchy structure:that is a circular target of radius rad and of reflectance roc, within an environment of reflectance roe. For uniform surface conditions only, you may consider directional reflectance as boundary conditions. Some analytical model are proposed, the user can specify his own values. The code assumes that the brdf is spectrally independent ground reflectance (spectral variation) Four typical reflectances are proposed, defined within given spectral range. this range differs according to the selected case. the reflectance is set to 0 outside this range,due to the deficiency of data. user must verify these limits. that is obviously irrelevant for brdf 1.输入几何条件 igeom 取值0 , 1-7 0：用户输入 太阳天顶角 太阳方位角 卫星天顶角 卫星方位角 月 天 以上参数按顺序用空格隔开 1：meteosat observation 用户需要再输入 月 天 十进制的小时（universal time）列 行 （full scal 5000*2500）2：goes east observation 用户需要再输入 月 天 十进制的小时（universal time）列 行 （full scal 17000*12000） 3：goes west observation 用户需要再输入 月 天 十进制的小时（universal time）列 行 （full scal 17000*12000） 4：avhrr ( PM noaa ) 用户需要再输入 月 天 十进制的小时（universal time）列（1-2048）xlonan hna 5：avhrr ( AM noaa ) 用户需要再输入 月 天 十进制的小时（universal time）列（1-2048）xlonan hna long.(xlonan) and overpass hour (hna) at the ascendant node at e