GPM/DPR/KuPR L2 Precipitation

GPM/DPR/KuPR L2 Precipitation dataset is obtained from the DPR sensor onboard GPM and produced by the Japan Aerospace Exploration Agency (JAXA). GPM Core Satellite carries Dual-frequency Precipitation Radar (DPR) and a microwave radiometer.Main purposes of the GPM are "Comprehension of horizontal and vertical structure of precipitation systems", "Acquisition of precipitation particles information" and "Improvement of accuracy of precipitation by constellation satellites". GPM Core Satellite can observe the range from the south latitude about 65 degrees to the north latitude about 65 degrees, and flies Non-Sun-synchronous Circular Orbit at about the 407 km altitude. To keep the altitude, the Core Satellite does the orbit maintenance maneuver. The interval is about 7-10 days. The swaths of DPR instrument are 125 and 245 km (78 and 152 mile) (245 km since May 21, 2018) for a Ka-band precipitation radar (KaPR) and a Ku-band precipitation radar (KuPR) respectively. In addition, simultaneous measurements are done at the overlapping of Ka/Ku-bands of the DPR. The GMI instrument is a conical-scanning multi-channel microwave radiometer covering a swath of 904 km (565 miles). The level 2 processing algorithm of the dual frequency precipitation radar additionally uses received power value profiles observed by KuPR and KaPR to estimate a precipitation intensity profile. It also estimates precipitation type, precipitation top height, and bright band height. Level 2 algorithm input data is a level 1 DPR product (calibrated radar echo power value profile), and level 2 algorithm output data is a level 2 product (precipitation intensity profile).The provided format is HDF5. The Sampling resolution are 5km(horizontal) and 125m/250m(vertical). The current version of the product is Version 7. The Version 6 is also available. The generation unit is one orbit.

GPM/DPR/KuPR L2级降水数据集取自搭载于全球降水测量（Global Precipitation Measurement, GPM）卫星的DPR传感器，由日本宇宙航空研究开发机构（Japan Aerospace Exploration Agency, JAXA）生成。GPM核心卫星搭载双频降水雷达（Dual-frequency Precipitation Radar, DPR）与微波辐射计。该任务的核心目标包括「解析降水系统的水平与垂直结构」「获取降水粒子信息」以及「通过卫星星座提升降水反演精度」。GPM核心卫星的观测覆盖范围为南纬约65度至北纬约65度，运行于高度约407公里的非太阳同步圆轨道。为维持轨道高度，该卫星需开展轨道维持机动，机动间隔约为7至10天。DPR仪器包含Ka波段降水雷达（Ka-band precipitation radar, KaPR）与Ku波段降水雷达（Ku-band precipitation radar, KuPR），二者的观测幅宽分别为125公里与245公里（对应78英里与152英里）；自2018年5月21日起，KuPR的观测幅宽统一调整为245公里。此外，DPR的Ka、Ku波段重叠区域可实现同步观测。锥形扫描多通道微波辐射计（conical-scanning multi-channel microwave radiometer, GMI）的观测幅宽达904公里（565英里）。双频降水雷达的L2级处理算法额外融合KuPR与KaPR获取的接收功率廓线，以估算降水强度廓线，同时还可反演降水类型、降水云顶高度与亮带高度。L2级算法的输入数据为L1级DPR产品（经校准的雷达回波功率廓线），输出数据为L2级产品（降水强度廓线）。本次提供的数据格式为HDF5。采样分辨率为水平5公里，垂直分辨率为125米/250米。当前产品版本为第7版（Version 7），同时也可获取第6版（Version 6）数据。数据集以单轨道为单位进行生成。