Spectral Reflectance Measurements NIMS grid Atqasuk, Alaska 2011

Spectral measurements were taken at each meter of the Networked Info-mechanical Systems (NIMS) grid in Atqasuk, Alaska during the summer of 2011. The NIMS grid is situated about 50 meters to the south of the International Tundra Experiment (ITEX) dry sites. Measurements were taken from the edge of each white board located at each meter aimed at the plots. The instrumentation used was a Unispec DC (dual channel) spectometer with fiber optics as sensors. A manfrotto tri-pod 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 tri-pod 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.

2011年夏季，研究团队于美国阿拉斯加州阿特夸斯克（Atqasuk）的网络化信息机械系统（Networked Info-mechanical Systems，NIMS）网格的每一米点位处开展光谱测量。该NIMS网格坐落于国际冻原实验（International Tundra Experiment，ITEX）干旱样地以南约50米处。测量工作以各一米点位处布设的每块白板边缘为起点，对准对应样地进行。本次测量采用搭载光纤作为传感器的双通道Unispec DC光谱仪。光谱数据采集过程中，使用配备臂式附件的曼富图三脚架固定光纤与传感器；该臂式附件搭载两个水准泡，用于协助尽可能保持传感器处于水平状态。当三脚架高度设置为1.62米时，测算得到的传感器视场覆盖范围约为50至60厘米。每次扫描的传感器观测角度为20度。此外，研究团队还在100%反射率的白板表面开展了额外的参考扫描。