GPM GROUND VALIDATION DC-8 CAMERA NADIR GCPEX

The GPM Ground Validation DC-8 Camera Nadir GCPEx dataset contains geo-located, visible-wavelength imagery of the ground obtained from the nadir camera aboard the NASA DC-8 in Canada during the Cold-season Precipitation Experiment (GCPEx). GCPEx addressed shortcomings in the GPM snowfall retrieval algorithm by collecting microphysical properties, associated remote sensing observations, and coordinated model simulations of precipitating snow. These data sets were collected to aid in the achievement of the over arching goal of GCPEx which is to characterize the ability of multi-frequency active and passive microwave sensors to detect and estimate falling snow. The data is available only for February 20, 2012, a clear-air flight day. DC-8 Camera nadir data may be useful for determining snow cover and lake ice cover for emissivity studies. The dataset also includes, for convenience and reproducibility, aircraft navigation information and ground temperatures to aid in emissivity retrievals.

GPM 地面验证 DC-8 相机俯视 GCPEx 数据集收录了在加拿大进行冷季降水实验（GCPEx）期间，由搭载于美国国家航空航天局 DC-8 飞机上的俯视相机获取的地面可见光波段影像。GCPEx 通过收集微物理特性、相关的遥感观测数据以及降水雪的协调模型模拟，针对 GPM 雪量检索算法的不足进行了弥补。这些数据集的收集旨在协助实现 GCPEx 的总体目标，即表征多频段主动和被动微波传感器检测与估计降雪能力。数据仅提供于 2012 年 2 月 20 日，一个晴空飞行日。DC-8 相机俯视数据可能对确定雪覆盖和湖冰覆盖，进而有助于发射率研究具有重要意义。为便利性和可重复性起见，数据集还包括了飞机导航信息和地面温度，以辅助发射率的提取。