Spectral Reflectance Measurements NIMS grid Imnavait, Alaska 2012

Spectral measurements were taken at each meter of the Networked Info-mechanical Systems (NIMS) grid in Imanvait, Alaska during the summer of 2012. Measurements were taken from the edge of each white board located at each meter aimed at the plots. The instrumentation used was a Unispec dual channel (DC) spectometer with fiber optics as sensors. A manfrotto tripod with an arm attachment was used to hold the fibers and sensors in place while taking the spectral measurements. The arm had 2 bubble levels to assist in keeping the sensors as level as possible. The calculated foot print cover is about 50-60 cm using a tripod height of 1.62 meters. The sensor angle for each scan is 20 degrees. Extra reference scans were taken on a 100% reflective white board surface.2012年夏季，在阿拉斯加州伊曼韦特（Imanvait）的网络化信息机械系统（Networked Info-mechanical Systems, NIMS）网格的每个测点处开展了光谱测量。本次测量的采样对象为每个测点处朝向野外样地的白板边缘。实验所用仪器为搭载光纤作为传感器的Unispec双通道（DC）光谱仪。开展光谱测量时，采用带有臂架附件的曼富图三脚架固定光纤与传感器，该臂架配备两个气泡水准仪，用于辅助维持传感器处于尽可能水平的状态。当三脚架高度设置为1.62米时，经计算，单次扫描的视场覆盖范围约为50至60厘米，单次扫描的传感器角度为20度。此外，还在100%反射率的白板表面开展了额外的参考扫描。