Spectral Reflectance Measurements NIMS grid Atqasuk, Alaska 2010

Spectral measurements were taken at each meter of the Networked Info-mechanical system (NIMS) grid in Atqasuk, Alaska during the summer of 2010. 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 dual channel (DC) spectrometer 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.2010年夏季，研究人员于美国阿拉斯加州阿特夸萨克（Atqasuk）的网络化信息机械系统（Networked Info-mechanical system, NIMS）网格的各一米测点处开展光谱测量工作。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。本次测量以设置于各测点处的白色白板边缘为观测起点，瞄准对应样地采集数据。所用仪器为搭载光纤传感器的Unispec双通道（DC）光谱仪。光谱测量过程中，搭载悬臂附件的曼富图（Manfrotto）三脚架用于固定光纤与传感设备。该悬臂配备两个气泡水平仪，用于协助将传感器维持在尽可能水平的状态。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。每次扫描的传感器视角为20度。