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首页> 外文学位 >Evaluation of a CCD camera system for BRDF retrieval for remote sensing applications for vicarious calibration.
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Evaluation of a CCD camera system for BRDF retrieval for remote sensing applications for vicarious calibration.

机译：评估用于BRDF检索的CCD摄像头系统，以用于替代应用的遥感应用。

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摘要

A CCD-camera based system for the retreival of bidirectional reflectance distribution function (BRDF) data has been evaluated for vicarious calibration applications. This evaluation is done by assessing the calibration requirements necessary to retrieve BRDF data for the improvement of the vicarious calibration approach, and then by examining the calibration problem itself. A sensitivity analysis shows that for a top of the atmosphere (TOA) radiance accurate to 0.1%, instrumental biases must be under 5% while pixel-to-pixel gain variations may be as great as 10%. A method for achieving the calibration requirements using a CCD-based BRDF camera system constructed by the Remote Sensing Group (RSG) at the University of Arizona Optical Sciences Center is presented. A relative calibration level of approximately 1% across the camera array is found to be achievable given the laboratory facilities of the RSG. Software designed to extract BRDF data from the BRDF camera system output and convert the data into a form usable in the RSG's radiative transfer code are described and demonstrated on example data sets. A diffuse-light correction algorithm and software to perform the correction on BRDF camera data are described, and the software is tested against several example data sets to evaluate the retrieval accuracy of the code. Retrieval accuracies of better than 0.5% in phase and better than 0.01% in radiance have been achieved with this code using modeled data and at a 45-degree solar zenith angle. Based on these results, CCD-camera based systems can be used to improve the level of accuracy of TOA radiance calculations for vicarious calibration.
机译：已经评估了用于双向反射率分布函数（BRDF）数据恢复的基于CCD相机的系统，用于替代校准应用。评估是通过评估获取BRDF数据以改进替代校准方法所必需的校准要求，然后通过检查校准问题本身来完成的。灵敏度分析表明，对于精确到0.1％的大气（TOA）辐射，仪器偏差必须低于5％，而像素间的增益变化可能高达10％。提出了一种使用由亚利桑那大学光学科学中心的遥感小组（RSG）构建的基于CCD的BRDF相机系统达到校准要求的方法。鉴于RSG的实验室设施，发现整个摄像机阵列的相对校准水平约为1％。在示例数据集上描述并演示了旨在从BRDF相机系统输出中提取BRDF数据并将数据转换为RSG辐射传输代码可用形式的软件。描述了一种对BRDF相机数据进行校正的漫射光校正算法和软件，并针对几个示例数据集对该软件进行了测试，以评估代码的检索准确性。使用此代码使用建模数据并在45度太阳天顶角下，已实现了相位精度优于0.5％且辐射亮度优于0.01％的检索精度。基于这些结果，基于CCD相机的系统可用于提高用于替代校准的TOA辐射度计算的准确性。

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  • 作者

    Nandy, Prabal.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Engineering Electronics and Electrical.;Physics Optics.
  • 学位 Ph.D.
  • 年度 2000
  • 页码 125 p.
  • 总页数 125
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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