论文部分内容阅读
WHI(Wide field-of-view Hyperspectral Imager)是具有5nm光谱分辨率的航空成像光谱仪,光谱范围从406nm到985nm。为评价该传感器在二类水体水质监测的性能,2006年1月9日在太湖地区进行航空飞行,并利用ASD和CE318同步测量水面光谱和大气参数。为比较准确的反演水质参数,对该传感器进行场地定标和替代定标,场地定标是对实验室定标后的辐亮度进行再次定标,替代定标利用同步点水面光谱计算的遥感反射率对图像计算的遥感反射率进行标定。最后对WHI进行大气纠正得到太湖的遥感反射率,并利用其他的准同步点进行精度检验,在532nm到750nm之间的大气纠正误差不超过5%。
WHI (Wide field-of-view Hyperspectral Imager) is an aerial imaging spectrometer with a spectral resolution of 5 nm, ranging from 406 nm to 985 nm. To evaluate the performance of this sensor in water quality monitoring of the second type of water bodies, air flight was conducted in the Taihu Lake area on January 9, 2006, and simultaneous measurement of water surface spectra and atmospheric parameters was carried out by using ASD and CE318. In order to compare the accuracy of water quality parameters inversion, the site calibration and alternative calibration of the sensor, site calibration is to re-calibrate the radiometer calibration laboratory, alternative calibration using the synchronization point surface water spectrum of remote sensing Reflectance The remote sensing reflectance calculated for the image is calibrated. Finally, atmospheric correction of WHI was performed to obtain the remote sensing reflectance of Taihu Lake. The accuracy of the test was verified by using other quasi-synchronous points. The error of atmospheric correction between 532nm and 750nm was no more than 5%.