Spectral Reflectance Measurements ARCSS grid Barrow, Alaska 2011

Spectral measurements were taken on a 30 plot subset within the Arctic System Science (ARCSS) grid in Barrow, Alaska during the summer of 2011. Spectral measurements were taken from the north eastern most corner of each plot. The subset is located from D2-D7 & H2-H7 within the 1 km^2 ARCSS grid. 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 was 20 degrees. Extra reference scans were taken on a 100% reflective white board surface. Some plots contain crosshairs that are used for point framing purposes and might have an effect on the reflectivity of each scan. Therefore, an extra scan was taken adjacent to each plot on the west side.

2011年夏季，在阿拉斯加巴罗的北极系统科学（Arctic System Science, ARCSS）网格内的30个样方子集中开展了光谱测量。光谱测量于每个样方的最东北角进行。该子集位于1平方公里ARCSS网格内的D2-D7及H2-H7区域。所用仪器为Unispec双通道（DC）光谱仪，以光纤作为传感器。测量过程中，使用带臂附件的曼富图（Manfrotto）三脚架固定光纤与传感器。该臂配有2个气泡水平仪，以帮助传感器保持尽可能水平的状态。当三脚架高度为1.62米时，计算得出的测量覆盖范围约为50-60厘米。每次扫描的传感器角度为20度。额外的参考扫描在100%反射率的白板表面进行。部分样方包含用于点取景的十字线，可能影响扫描的反射率。因此，在每个样方西侧的相邻区域额外进行一次扫描。