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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >The MODIS 2.1-/spl mu/m channel-correlation with visible reflectance for use in remote sensing of aerosol
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The MODIS 2.1-/spl mu/m channel-correlation with visible reflectance for use in remote sensing of aerosol

机译:MODIS 2.1- / spl mu / m通道相关性与可见反射率,用于气溶胶遥感

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摘要

A new technique for remote sensing of aerosol over the land and for atmospheric correction of Earth imagery is developed. It is based on detection of dark surface targets in the blue and red channels, as in previous methods, but uses the 2.1 /spl mu/m channel, instead of the 3.75 /spl mu/m for their detection. A 2.1-/spl mu/m channel is present on ADEOS OCTS and GLI and planned on EOS-MODIS and EOSP, and a similar 2.2-/spl mu/m channel is present on Landsat TM. The advantage of the 2.1-/spl mu/m channel over the 3.75-/spl mu/m channel is that it is not affected by emitted radiation. The 2.1-/spl mu/m channel is transparent to most aerosol types (except dust) and therefore can be used to detect dark surface targets. Correlation between the surface reflection in the blue (0.49 /spl mu/m), red (0.66 /spl mu/m), and 2.1 /spl mu/m is established using atmospherically corrected Landsat TM and AVIRIS aircraft images collected over the Eastern United States, Maine, and California and spectral data obtained from the ground and light aircraft near San Diego, CA. Results from a variety of surface covers show that the surface reflectance at 0.49 /spl mu/m (/spl rho//sub 0.49/) and 0.66 /spl mu/m (/spl rho//sub 0.66/) can be predicted from that at 2.2 /spl mu/m (/spl rho//sub 2.2/) within /spl Delta//spl rho/=/spl plusmn/0.06 for /spl rho//sub 2.2//spl les/0.10, using /spl rho//sub 0.49/=/spl rho//sub 2.2//4 and /spl rho//sub 0.66/=/spl rho//sub 2.2//2. Error in surface reflectance of 0.006 corresponds to an error in remote sensing of aerosol optical thickness, /spl tau/, of /spl Delta//spl tau//spl sim//spl plusmn/0.06. These relationships were validated using spectral data taken close to the surface over vegetated areas in a different biome. This method expends application of dark targets for remote sensing of aerosol to brighter, nonforested vegetation. The higher reflection of the surface at 2.2 /spl mu/m than that of 3.75 /spl mu/m may even enable remote sensing of dust above surfaces with reflectivity /spl rho//sub 2.2/=0.15/spl plusmn/0.05. For this reflectivity range the dust radiative effect at 2.2 /spl mu/m is small, and the surface reflectance in the blue and red channels can be retrieved.
机译:开发了一种用于陆地上的气溶胶遥感和地球图像的大气校正的新技术。与以前的方法一样,它基于检测蓝色和红色通道中的暗表面目标,但是使用2.1 / spl mu / m通道而不是3.75 / spl mu / m进行检测。 ADEOS OCTS和GLI上有一个2.1- / spl的mu / m通道,而EOS-MODIS和EOSP上已经计划了一个通道,而Landsat TM上也有一个2.2- / spl的mu / m通道。 2.1- / spl mu / m通道比3.75- / spl mu / m通道的优势在于它不受发射辐射的影响。 2.1- / spl mu / m通道对大多数气溶胶类型(灰尘除外)都是透明的,因此可用于检测深色表面目标。使用在美国联合航空上收集的经大气校正的Landsat TM和AVIRIS飞机图像,可以建立蓝色(0.49 / spl mu / m),红色(0.66 / spl mu / m)和2.1 / spl mu / m的表面反射之间的相关性。州,缅因州和加利福尼亚州以及从加利福尼亚圣地亚哥附近的地面和轻型飞机获得的光谱数据。各种表面覆盖物的结果表明,可以通过以下方法预测0.49 / spl mu / m(/ spl rho // sub 0.49 /)和0.66 / spl mu / m(/ spl rho // sub 0.66 /)的表面反射率在/ spl Delta // spl rho / = / spl plusmn / 0.06中以/ spl rho // sub 2.2 // spl les / 0.10为2.2 / spl mu / m(/ spl rho // sub 2.2 /),使用/ spl rho // sub 0.49 / = / spl rho // sub 2.2 // 4和/ spl rho // sub 0.66 / = / spl rho // sub 2.2 // 2。 0.006的表面反射误差对应于/ spl Delta // spl tau // spl sim // spl plusmn / 0.06的气溶胶光学厚度/ spl tau /的遥感误差。使用在不同生物群落的植被区域附近表面获取的光谱数据验证了这些关系。这种方法将黑暗目标的应用扩展到了对明亮,未森林植被的气溶胶遥感中。 2.2 / spl mu / m的表面反射比3.75 / spl mu / m的反射率更高,甚至可以以/ spl rho // sub 2.2 / = 0.15 / spl plusmn / 0.05的反射率遥测表面上方的灰尘。在此反射率范围内,粉尘的辐射效应在2.2 / spl mu / m处很小,并且可以获取蓝色和红色通道中的表面反射率。

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