HY-1C卫星COCTS近海水体遥感反射率产品真实性检验
Validations of the HY-1C COCTS remote sensing reflectance products in coastal waters
- 2023年27卷第1期 页码：14-25
纸质出版日期： 2023-01-07
DOI： 10.11834/jrs.20235004
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摘要
中国HY-1C卫星水色水温扫描仪（COCTS）从2018年9月发射至今已积累了大量的全球观测数据，本文利用AERONET-OC实测数据集对COCTS近海水体遥感反射率（
R
rs）产品进行了真实性检验。本文对实测光谱数据集进行归一化处理，按光谱特征分为A（清洁）、B（比较清洁）、C（轻微浑浊）、D（比较浑浊）这4种光学水体类型，对COCTS
R
rs产品在这4类水体的精度进行评价。结果表明：COCTS反演
R
rs在A、B两种水体类型中存在轻微高估（平均绝对百分比误差APD（Average absolute Percent Difference）分别为38.79%、44.44%），在C类水体轻微低估（APD=40.85%），而在D类水体显著低估（APD=47.14%）。COCTS不同波段
R
rs产品在4类水体的精度亦存在差异，其中412 nm、443 nm波段在A类水体中和实测数据一致性相对较好（APD均小于30%）；520 nm、565 nm波段在C、D两类水体中和实测数据一致性相对较好（APD均小于30%）；670 nm波段在4种水体均呈现显著低估。由于AERONET-OC波段和COCTS存在差异，可能会导致评估误差存在高估，未来需要使用连续光谱的实测数据进一步评价COCTS产品精度。
Abstract
A large number of global observation data was obtained by HY-1C COCTS since its launch in September 2018. The comprehensive evaluation of the HY-1C/COCTS products is important for further applications. In this study
we used the global in-situ data from AERONET-OC to evaluate the performance of the remote sensing reflectance (
R
rs) products of the HY-1C COCTS. Firstly
the AERONET-OC dataset were divided into four optical water types (A
clean water; B
relatively clean water; C
slightly turbid water; D
turbid water) based on a spectral normalization method. Secondly
the AERONET-OC
R
rs data and HY-1C/COCTS retrieved
R
rs data were matched according to the defined spatial-temporal windows (5×5 box and 1 hour). Finally
the performances of the HY-1C/COCTS
R
rs products were quantitatively evaluated in the four optical water types. As a result
good correlation between satellite and in-situ
R
rs data was indicated as R values among four types water ranged from 0.680 to 0.879. In type A water
the relatively good consistency between satellite and in-situ
R
rs data was observed as average percent difference (PD) at 6.79%
and the average absolute percent difference (APD) at 38.79%. In type B water
slight overestimation of satellite data occurred with PD at 18.73% and APD less than 45%. Underestimation of satellite data was reported in type C water
as negative remote sensing
R
rs data in 412 nm and 443 nm bands were with PD at -14.38% and APD at 47.14%. Similarly
in type D water
negative
R
rs in 412 nm and 443 nm bands were with PD at -32.35%
and APD at 47.14%
indicating significant underestimation from the satellite data. In addition
difference of accuracy performance of
R
rs products in different bands of COCTS for four water types was also observed.
R
rs presented good consistency between in situ and COCTS data in band 412 nm and 443 nm for type A water. Better consistency in band 520 nm and 565 nm was observed for type C
D water than type A water while significant underestimation of COCTS
R
rs were reported in all four types of water compared to in situ data. Overall
COCTS and in situ
R
rs data showed good consistency in clean water
but remained relatively inconsistent in turbid water. Our results also reported that the COCTS inversed
R
rs products are slightly overestimated compared with the AERONET-OC in situ data in type A and B water. In contrast
COCTS products slightly underestimated
R
rs for type C water but significantly underestimated for type D water. Attention should also be paid to enlarge the evaluated errors
as the AERONET-OC in-situ spectral data was linearly interpolated to match COCTS band. In the future
the hyperspectral in-situ
R
rs data should be used to further evaluate the performance of COCTS.
关键词
HY-1C卫星水色水温扫描仪遥感反射率AERONET-OC真实性检验
Keywords
HY-1CCOCTSremote sensing reflectanceAERONET-OCvalidation
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中国科学院空天信息创新研究院
中国科学院空天信息创新研究院 遥感科学国家重点实验室
国家海洋技术中心
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