Progress in field spectroscopy
Progress in field spectroscopy
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DOI：
10.1016/j.rse.2007.08.001
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发表时间：
2009-09-01
影响因子：
13.5
通讯作者：
Fox, Nigel
中科院分区：
文献类型：
--
作者：
Milton, Edward J.;Schaepman, Michael E.;Fox, Nigel
本文回顾了野外光谱学的发展，尤其着重于过去的二十年。在此期间，野外光谱学已成为一种重要的技术，用于原位表征自然表面的反射率，支持航空和卫星传感器的替代校准，并提供一种将从小面积（如树叶、岩石）到复合场景（如植被冠层），最终到像元的测量进行放大的方法。本文描述了该学科的物理基础，并评估了在一系列研究中所采用的不同方法和仪器。描述了野外测角仪的发展和使用，并与从野外定向反射率测量中估算双向反射分布函数（BRDF）的方法相关联。本文还考虑了野外光谱学的实际方面，并确定了影响野外光谱辐射计可用性的若干因素，包括仪器的重量和成本、一些常用方法的局限性以及诸如显示屏清晰度和电池续航能力有限等实际问题。结合野外光谱数据将对基于地球观测（EO）的全球测量和监测系统做出日益重要的贡献，特别是通过将其同化到数值模型中，对野外光谱学的未来前景进行了思考。然而，要实现这一点，至关重要的是数据具有高质量，有明确的准确度和不确定度水平，并且制定并维护通用协议以确保野外光谱数据的长期价值。强调了在描述测量几何配置时采用精确术语对于重复性和再现性问题的重要性。通过方法上的这些改进，野外光谱学将确立其作为一种可靠的环境测量方法的地位，支撑定量地球观测及其在环境和地球科学中的应用。（C）2007爱思唯尔公司。保留所有权利。
This paper reviews developments in the science of field spectroscopy, focusing on the last twenty years in particular. During this period field spectroscopy has become established as an important technique for characterising the reflectance of natural surfaces in situ, for supporting the vicarious calibration of airborne and satellite sensors, and for providing a means of scaling-up measurements from small areas (e.g. leaves, rocks) to composite scenes (e.g. vegetation canopies), and ultimately to pixels. This paper describes the physical basis of the subject and evaluates the different methods and instruments which have been employed across a range of studies. ne development and use of field goniometers is described, and related to methods for estimating the bidirectional reflectance distribution function (BRDF) from directional reflectance measurements in the field. The paper also considers the practical aspects of field spectroscopy, and identifies a number of factors affecting the useability of field spectroradiometers, including the weight and cost of the instruments, limitations of some commonly used methodologies and practical issues such as the legibility of displays and limited battery life. The prospects for the future of field spectroscopy are considered in relation to the increasingly important contribution that field spectral data will make to EO-based global measurement and monitoring systems, specifically through their assimilation into numerical models. However, for this to be achieved it is essential that the data are of high quality, with stated levels of accuracy and uncertainty, and that common protocols are developed and maintained to ensure the long-term value of field spectroscopic data. The importance of employing a precise terminology for describing the geometric configuration of measurements is highlighted in relation to issues of repeatability and reproducibility. Through such refinements in methodology, field spectroscopy will establish its credentials as a reliable method of environmental measurement, underpinning quantitative Earth observation and its applications in the environmental and Earth sciences. (C) 2007 Elsevier Inc. All rights reserved.