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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >ULGS II: A High-Performance Field and Laboratory Spectrogoniometer for Measuring Hyperspectral Bidirectional Reflectance Characteristics
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ULGS II: A High-Performance Field and Laboratory Spectrogoniometer for Measuring Hyperspectral Bidirectional Reflectance Characteristics

机译：ULGS II：用于测量高光谱双向反射特性的高性能现场和实验室分光光度计

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摘要

The derivation of the bidirectional reflectance distribution function (BRDF) from Earth surface features provides vital data for improved remote estimation of Earth surface features and properties. The angular component of a reflectance signature represents a valuable source of information that has largely been ignored due to the lack of empirical data. BRDF data products are now readily available from a variety of remote sensing platforms, and these require extensive field validation to ensure data quality and validity. This paper presents a high-performance, low-cost, and computer-controlled goniometer system capable of sampling surface BRDF and demonstrates several example applications. The system introduces a number of technological advances, including real-time reflectance calibration, programmable sampling schemes, zero target interference structure, and ease of portability. Using this instrument, BRDF estimates were gathered from a variety of agricultural crops in field and laboratory settings, with performance gains of four times the speed of current designs. This system can provide very fast acquisition of a BRDF estimate, depending on the desired angular resolution. Initial experiments demonstrate that this new style of hyperspectral goniometer is a significant advance over previous designs, with respect to scan capabilities, angular resolution, calibration, and portability.
机译：地表特征的双向反射率分布函数（BRDF）的推导提供了重要的数据，可用于改进地表特征和特性的远程估计。反射特征的角度分量代表有价值的信息源，由于缺乏经验数据，该信息已被很大程度上忽略。 BRDF数据产品现在可以从各种遥感平台上轻松获得，这些产品需要进行广泛的现场验证，以确保数据质量和有效性。本文提出了一种高性能，低成本，计算机控制的测角仪系统，该系统能够对BRDF表面进行采样，并演示了一些示例应用。该系统引入了许多技术进步，包括实时反射率校准，可编程采样方案，零目标干扰结构以及易于携带。使用该工具，可以在田间和实验室环境中从各种农作物中收集BRDF估算值，其性能提升是当前设计速度的四倍。该系统可以根据所需的角分辨率非常快速地获取BRDF估计值。初步实验表明，在扫描能力，角分辨率，校准和便携性方面，这种新型的高光谱测角仪比以前的设计有了显着进步。

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