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遥感接收的信息反应了地物的电磁波特性。它的工作波段已远远超出了人眼有响应的可见光波段,而扩展至紫外、红外和微波等波段。因此要识别遥感图象必须依据各类地物在这些波段中的波谱特性。遥感中常用的扫描型传感器所记录的数值与地物的波谱值有定量的对应关系,因而准确地测定地物的波谱值,是定量遥感工作的基础。 由北京大学遥感技术应用研究所和物理学研制的RS-Ⅱ型四通道野外光谱仪,是为测定地物在可见光和近红外波段的反射率而设计的一种便携式野外光谱仪。它有四个光谱通道,这些通道的光谱范围与陆地卫星中的多光谱扫描仪(MSS)的四个波段的光谱范
The information received by remote sensing reflects the electromagnetic wave characteristics of the feature. Its operating band far beyond the visible eye of the human eye response, but extended to ultraviolet, infrared and microwave bands. Therefore, to identify remote sensing images must be based on various types of features in these bands of spectral characteristics. The commonly used scanning sensors in remote sensing record the values and the spectral values of ground objects have quantitative correspondence, so accurately measuring the spectral value of ground objects is the basis of quantitative remote sensing. The RS-II four-channel field spectrometer, developed by Peking University Institute of Remote Sensing Technology and Physics, is a portable field spectrometer designed to measure the reflectivity of objects in the visible and near-infrared wavelengths. It has four spectral channels, the spectral range of these channels and Terrestrial Satellite Multispectral Scanner (MSS) of the four bands spectral range