野外地物光谱测量技术及方法

The Technology and Method of Field Spectrometry

野外地物光谱测量在航天航空传感器定标、遥感数据解译、遥感应用潜力研究以及地质填图等方面得到广泛应用。野外采集准确的地物波谱需要熟知各种不同的光照条件、大气特性和稳定性(云、风)、仪器视场角、观测和光线照射的结合角度、仪器扫描速度以及目标特征的时空变化等,这些因素对目标波谱具有很大的影响。进行野外光谱测量的第一步是整个试验的总体设计,在设计中必须结合研究目标和研究对象的具体特性综合考虑数据采集的时间、野外测量的空间尺度、光线照射和观测的几何角度以及记录的野外描述数据等问题。此文详细讨论这些因素对地物光谱测量的影响。

The collection of accurate spectra in the field requires an awareness of the influences of the various sources of illumination, atmospheric characteristics and stability, winds, instrument field of view, target viewing and illumination geometry, instrument scanning time, and the spatial and temporal variability of the characteristics. The first step in the development of a field experiment is the definition of the overall experimental design. Issues such as the timing of the data collection, spatial scale of the field measurement, target viewing and illumination geometry, and the collection of ancillary data sets must be considered in light of the objective of the study. This paper discussed how these factors influence spectrum measure result.