干旱区生态环境知识资源中心(Arid): FY-3B卫星MERSI可见光近红外波段定标精度评估

Arid

	FY-3B卫星MERSI可见光近红外波段定标精度评估
其他题名	Calibration Accuracy Evaluation of Visible and Near-Infrared Bands of FY-3BMERIS
	何兴伟; 韩琦; 冯小虎; 康宁
来源期刊	光学学报
ISSN	0253-2239
出版年	2020
卷号	40 期号:18
中文摘要	FY-3B中分辨率光谱成像仪(MERSI)不能实现可见光近红外波段的星上绝对定标。为了提高MERSI高信噪比窄波段通道的辐射定标精度,针对国际通用的6个北非沙漠目标,利用高质量的SeaWiFS数据构建天顶双向反射分布函数(BRDF)模型,借助MODTRAN辐射传输模型和ERA-Interim再分析资料吸收气体数据构建光谱匹配因子,对FY-3BMERSI 5年的在轨运行数据进行交叉定标研究。所构建的天顶反射模型可以准确表达伪不变目标的天顶反射率,波段预测误差基本都在3%之内;考虑观测几何条件和吸收气体含量的参数化光谱匹配因子可以有效预测MERSI的天顶反射率;交叉定标结果的时间序列十分稳定且无明显趋势,与伪不变目标的天顶辐射信号长期稳定且规律性变化的特点一致。与MERSI L1业务化定标结果相比,第8~12波段的定标结果偏低,相对偏差小于0,而第13~16波段的定标结果偏高,相对偏差大于0。除了波段8以外的其他8个波段的偏差基本都在 -5%~5%以内。波长小于600nm的波段的月平均偏差较大,特别是三个蓝光波段(第8~10波段);第13~16波段的月平均偏差相对稳定,基本都在-5%~5%以内。
英文摘要	FY-3Bmedium resolution imaging spectrometer(MERIS)cannot achieve the absolute calibration for the visible and near-infrared bands.To improve the MERIS absolute calibration accuracy,the six widely used north African desert pseudo-invariant targets are adopted herein,taking the advantage of the high-quality SeaWiFS data to construct the bidirectional reflectance distribution function(BRDF)model and then using the MODTRAN radiative transfer model and ERA-Interim absorption gas reanalysis data to construct the spectral band adjustment factor (SBAF).Lastly,five years of FY-3BMERIS data are used for the cross-calibration.The constructed BRDF model in this study can accurately express the top of atmosphere(TOA)reflectance(rhoTOA)over the pseudo-invariant targets,and the prediction error is basically within 3%.The TOA reflectance of MERIS can be effectively predicted through the parameterized SBAF which considers the observation geometry and absorbed gas content.Crosscalibration results show that the time series are extremely stable and have no obvious trends,which are consistent with the characters of TOA reflectance over pseudo-invariant targets.Compared with the operational calibration results of MERIS L1,the cross-calibration results of bands 8--12are lower and the bias is less than zero,whereas for bands 13--16,the results are higher and the bias is greater than zero.Except for band 8,the biases of the other eight bands are within-5%--5%.The monthly mean deviation of bands with a wavelength less than 600nm are larger,particularly the three blue bands(bands 8--10).The monthly mean relative deviations of bands 13--16are relatively stable,and they are basically within-5%--5%.
中文关键词	遥感 ; 中分辨率光谱成像仪 ; 交叉定标 ; 光谱匹配因子 ; 双向反射分布函数
英文关键词	remote sensing medium resolution imaging spectrometer cross-calibration spectral band adjustment factor bidirectional reflectance distribution function
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Remote Sensing
CSCD记录号	CSCD:6819518
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336987
作者单位	何兴伟, 中国气象局国家卫星气象中心, 北京 100081, 中国.; 韩琦, 中国气象局国家卫星气象中心, 北京 100081, 中国.; 冯小虎, 中国气象局国家卫星气象中心, 北京 100081, 中国.; 康宁, 中国气象局国家卫星气象中心, 北京 100081, 中国.
推荐引用方式 GB/T 7714	何兴伟,韩琦,冯小虎,等. FY-3B卫星MERSI可见光近红外波段定标精度评估[J],2020,40(18).
APA	何兴伟,韩琦,冯小虎,&康宁.(2020).FY-3B卫星MERSI可见光近红外波段定标精度评估.光学学报,40(18).
MLA	何兴伟,et al."FY-3B卫星MERSI可见光近红外波段定标精度评估".光学学报 40.18(2020).