4.7 Article

An In-Flight Radiometric Calibration Method Considering Adjacency Effects for High-Resolution Optical Sensors Over Artificial Targets

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TGRS.2020.3040866

关键词

Adjacency effects; high-resolution; point spread function (PSF); vicarious radiometric calibration

资金

  1. National Key Research and Development Program of China [2016YFB0500400, 2018YFB0504800, 2018YFB0504604]
  2. Bureau of International Co-operation Chinese Academy of Sciences (CAS) [181811KYSB20160040]
  3. Dragon 4 ESA-MOST Cooperation Programme [32426_1]
  4. CAS Interdisciplinary Innovation Team
  5. MetEOC-3 Project through the European Metrology Programme for Innovation and Research (EMPIR) Programme [16ENV03]
  6. European Union

向作者/读者索取更多资源

This study developed a method to simulate the adjacency effects in the radiometric calibration of space-borne remote sensors by constructing a local atmospheric point spread function model and considering background reflectance spectral information. The proposed modeling method effectively accounts for the influence of adjacency effects, as demonstrated by tests on Sentinel-2A and Worldview-3 imagery. The uncertainty assessment results show that the method can achieve a total uncertainty of less than 7%.
When using a field calibration site to perform in-orbit radiometric calibration of a space-borne remote sensor, the measured signal by the sensor may contain radiation from adjacent pixels, due to scattering in the Earth's atmosphere and the sensor viewing characteristics. If this is not accounted for in the modeling, the accuracy of the radiometric calibration will be reduced. Nonuniformities of the ground target are more significant for the calibration of high-resolution sensors. In addition, if the brightness contrast of neighboring targets is not small, the impact of the adjacency effects will be more significant. It is important to quantitatively analyze and estimate the influence of this kind of adjacency effects, to reduce the uncertainty of in-orbit radiometric calibration. To evaluate the adjacency effects caused by atmospheric multiple scattering, this article constructed a local atmospheric point spread function model using long time-series satellite-ground synchronous observation data and developed an adjacency effects simulation method, which considers background reflectance spectral information. Tests on Sentinel-2A and Worldview-3 imagery overpassing the Baotou calibration and validation site (Baotou C&V site) (China) indicate that the proposed modeling method can effectively account for the influence of the adjacency effects in vicarious calibration. Uncertainties of relevant parameters and their contributions to the calibration result were also analyzed, and uncertainty assessment results show that the vicarious radiometric calibration scheme considering adjacency effects correction can bring about a total uncertainty less than 7%.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据