SE-590 REFLECTANCE & RADIANCES (FIFE)

The SE-590 Reflectance Factors and Radiances Measured from a Helicopter Data Set were collected using the helicopter-borne SE-590 during Intensive Field Campaign 5 (IFC-5) in 1989. These data were collected at 17 different grid locations within the FIFE study area. Data were collected on 6 days from July 28, 1989 through August 8, 1989, when sky conditions were clear. The helicopter missions were designed to provide a means of spectrally characterizing each FIFE site and provide an intermediate scale of sampling between that of the surface measurements and the higher altitude aircraft and spacecraft multispectral imaging devices. The SE-590 instrumentation was chosen to provide compatibility with surface-based radiometers and TM spacecraft sensors. Off-nadir measurements were made as a means of providing more accurate estimates of hemispherical reflectance and for use with bi-directional reflectance models.本数据集为1989年第5次密集野外作业（Intensive Field Campaign 5，简称IFC-5）期间，通过机载SE-590仪器采集的直升机载反射率因子与辐亮度数据。这些数据采集于FIFE研究区域内的17个不同网格测点，采集时段为1989年7月28日至8月8日，共6个晴朗天气日。本次直升机飞行任务旨在实现对每个FIFE测点的光谱特征刻画，并提供介于地表测量与高空航空器、航天器多光谱成像设备之间的中等尺度采样方案。选用SE-590仪器的初衷是使其与地面辐射计及TM航天器传感器具备兼容性。本次观测采用非天底观测模式，以更精准地估算半球反射率，并适配双向反射率模型的应用需求。