野外地物光谱仪和水体光谱仪测量水体光谱差异研究  

Research on Water Spectral Differences Based on Field Object Spectrometer and Water Spectrometer

作　　者：曹晓艺 崔建勇[1] 董文 许明明 万剑华[1] CAO Xiao-yi;CUI Jian-yong;DONG Wen;XU Ming-ming;WAN Jian-hua(College of Oceanography and Space Informatics,China University of Petroleum(East China),Oingdao 266580,China;Academy of Aerospace Information Innovation,Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [2]中国科学院空天信息创新研究院,北京100094

出　　处：《光谱学与光谱分析》2025年第3期753-760,共8页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(U1906217,62071491);中央高校基础研究基金项目(22CX01004A-5,22CX01004A-4);国家民用空间基础设施陆地观测卫星共性应用支撑平台(2017-000052-73-01-001735)资助。

摘　　要：现场实测水体光谱数据是遥感反演的基础,通常采用野外地物光谱仪采集水体光谱数据,但野外地物光谱仪对于水上测量的可用性难以评估。对使用野外地物光谱仪和水体光谱仪水上实验测量的数据,从抗噪能力、测量结果、影响两类仪器的外界环境、水质参数反演几个方面进行差异分析。在对比两类光谱仪用于水体光谱测量的差异前,对两种仪器抗噪声能力的对比发现,水体光谱仪的抗噪声能力较强,因此将水体光谱仪的数据作为参照标准进行分析。首先在太阳辐照度差异上,两类仪器测得太阳辐照度的关联系数在0.5~0.75范围内变化,两种仪器太阳辐照度存在关联;其次,在361、411、461、511和561 nm五个波长对比天空光辐亮度变化发现水体光谱仪获得的太阳辐亮度变化范围小,数据获取比野外地物光谱仪稳定,对比不同时间海面总辐亮度变化,发现水体光谱仪在不同时间所得到的辐亮度存在差异,两者变化曲线不同,野外地物光谱仪在太阳光照弱时信噪比降低,导致各波段观测值波动剧烈,计算所得反射率差值,上午10点前和下午4点后这种现象明显。最后,对比发现不同风速条件下外界环境对两种仪器处理过程中气-水界面反射率会有影响,需要按照风速对气-水界面反射率的值进行数据修正,这样得到的遥感反射率才更加准确。光谱仪获取水体反射光谱曲线后,通常用于水质参数定量反演,为了对比分析两种光谱仪观测结果对水质参数反演精度的影响,使用两个仪器观测的水体反射光谱曲线,对悬浮物浓度进行反演,分别与对应位置采集水样的实验检测结果对比,发现两个结果差异较大,水体光谱仪精度比野外地物光谱高。此外两种仪器不能混合使用,这样会使结果误差更大。通过对两种光谱仪获取数据的处理和分析以及水质参数的反演,对野外地物光谱仪进行水体测�In-site measured water spectral data is the basis of remote sensing inversion.Field object spectrometers are usually used to measure water spectral data.However,the usability of field object spectrometers for water measurements is difficult to evaluate.This article uses the data from the water measurement experiments of the field object spectrometer and the water spectrometer to conduct a difference analysis in terms of noise immunity,measurement results,external environment affecting the two types of instruments,and water quality parameter inversion.Before comparing the differences between the two types of spectrometers for water spectrum measurement,a comparison of the anti-noise capabilities of the two instruments found that the water spectrometer has a stronger anti-noise ability,so the data of the water spectrometer is used as a reference standard for analysis.First of all,regarding the difference in solar irradiance,the correlation coefficient of the solar irradiance measured by the two types of instruments varies in the range of 0.5~0.75,and there is a correlation between the solar irradiance of the two instruments;Secondly,by comparing the changes in skylight radiance at the five wavelengths of 361,411,461,511,and 561 nm,we found that the range of changes in solar radiance obtained by the water spectrometer is smaller.The data acquisition is more stable than the field object spectrometer.By comparing the changes in the total radiance of the sea surface at different times,it is found that there are differences in the radiance obtained by the water spectrometer at different times,and the two change curves are different.The signal-to-noise ratio of the field object spectrometer decreases when the sunlight is weak,resulting in drastic fluctuations in the observed values of each band.The calculated reflectivity difference is obvious before 10 am and after 4 pm.Finally,the comparison shows that the external environment under different wind speed conditions impacts the air-water interface reflectance during the

关 键 词：光谱仪 水体光谱测量 遥感反射率 差异分析 

分 类 号：P715.4[天文地球—海洋科学]