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根据理论和经验上已证明的地表温度与AVHRR窗区通道4、5的亮度温度存在线性或非线性关系, 通过对2818条全球晴空大气廓线做不同比辐射率地表的FY-1D窗区通道4、5辐射率的模拟计算, 推导出FY-1D极轨气象卫星的红外通道4、5亮温与地表温度的二次回归关系式。同时详细介绍了由这一回归关系式和FY-1D高分辨率图像传输 (HRPT) 遥测数据计算陆表温度的方法, 最后给出陆表温度计算结果的精度:用中国地面气象台站的0 cm地温观测数据与相同时刻的分辨率为0.01°×0.01°经纬度的卫星陆表温度相对比, 两者非常吻合, 绝大部分台站|ΔT|<3.0 K。 相似文献
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The NOAA is a special meteorological satellite. The first and second channels of the AVHRP (the sensor of NOAA) are much similar to the fifth and seventh channels of the resource satellite MSS, and their corresponding spectral response curves are much alike. The AVHRR'S first channel has a higher reflectivity from soil, and the second channel is highly reflected by vegetation. By virtue of its wide sensitivity range, multiple reception orbitals, economical and convenient, it has been used in the W.S.A. in the agricultural estimation.According to the characteristic spectra from the vegetation, and through the digital exchange of the measuraed values on the first and second channels of the NOAA/AVHRR, We established a servies of green models which can be need in making agricultural estimation satisfactorily.As expesimentally showed that these green models highly correlated to the yeild of crops. This has been presently becoming the main information sources for yield estiraatings. With the forecast of the 相似文献
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本文研究了FY-1BVHRSR的三个可见光通道和一个近红外通道监测1991年夏天中国江淮地区洪水的能力。分析该区域不同水体的各个通道的光谱状况表明,VHRSR第二通道区别水、陆(植被)边界十分显著,VHRSR第一通道有感应洪水泥沙含量信息的能力,VHRSR的第三、四通道(海洋通道)则可以获得水深信息。文中针对FY-1B的波段的特点设计了几种信息增强方法,从而有效地识别出水陆边界,计算了洪水深度及洪水浑浊度的相对等级,精确地统计出洪水的面积。结果表明FY-1B在洪水监测中大有潜力。 相似文献