GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V07

This dataset contains Version 07 of the Integrated Multi-satellitE Retrievals for GPM (IMERG) IMERG Level 3 "Final Run" precipitation analysis at 0.1 degree, half-hour resolution. From the official GPM IMERG site at NASA GES DISC [https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGHH_07/summary]: The Integrated Multi-satellitE Retrievals for GPM (IMERG) IMERG is a NASA product estimating global surface precipitation rates at a high resolution of 0.1 degree every half-hour beginning June 2000. It is part of the joint NASA/JAXA Global Precipitation Measurement (GPM) mission, using the GPM Core Observatory satellite (for June 2014 to the present) and the Tropical Rainfall Measuring Mission (TRMM) satellite (for June 2000 to May 2014) as the standard to combine precipitation observations from an international constellation of satellites using advanced techniques. IMERG can be used for global-scale applications, including over regions with sparse or no reliable surface observations. The fine spatial and temporal resolution of IMERG data allows them to be accumulated to the scale of a user's application for increased skill. IMERG has three Runs with varying latencies in response to a range of application needs: rapid-response applications (Early Run, 4-hour latency), same/next-day applications (Late Run, 14-hour latency), and post-real-time research (Final Run, 3.5-month latency). While IMERG strives for consistency and accuracy, satellite estimates of precipitation are expected to have lower skill over frozen surfaces, complex terrain, and coastal zones. As well, the changing GPM satellite constellation over time may introduce artifacts that affect studies focusing on multi-year changes. This dataset is the GPM Level 3 IMERG Final Half-Hourly 0.1 degree x 0.1 degree (GPM_3IMERGHH). The dataset represents the Final Run estimate of the native half-hourly precipitation rate in millimeters per hour. The complete global "precipitation" data field is complete except for a few grid boxes at the poles. However, missing values are very common in the microwave-only "MWprecipitation" data field. See the official GPM IMERG site at NASA GES DISC [https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGHH_07/summary] for the complete dataset abstract and more information.

本数据集包含全球降水测量计划（Global Precipitation Measurement, GPM）集成多卫星反演产品（Integrated Multi-satellitE Retrievals for GPM, IMERG）第7版的3级“最终运行版”降水分析数据，其空间分辨率为0.1度，时间分辨率为半小时。数据源自NASA地球科学数据信息中心（NASA GES DISC）官方GPM IMERG站点[https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGHH_07/summary]：

GPM集成多卫星反演产品（IMERG）是NASA研发的官方产品，可估算全球地表降水率，自2000年6月起，以0.1度空间分辨率、每半小时一次的时间分辨率输出数据。该产品是NASA与日本宇宙航空研究开发机构（Japan Aerospace Exploration Agency, JAXA）联合实施的全球降水测量任务（GPM）的组成部分，以GPM核心观测卫星（2014年6月至今）和热带降雨测量任务（Tropical Rainfall Measuring Mission, TRMM）卫星（2000年6月至2014年5月）为基准，通过先进技术整合国际卫星星座的降水观测数据。

IMERG可应用于全球尺度的各类研究场景，尤其适用于地表观测稀疏或无可靠观测数据的区域。其精细的时空分辨率支持用户根据自身应用场景进行累加计算，从而提升分析精度。IMERG针对不同应用需求推出了三种延迟时长各异的运行版本：面向快速响应场景的“早期运行版”（延迟4小时）、面向当日/次日应用的“延迟运行版”（延迟14小时），以及面向事后实时研究的“最终运行版”（延迟3.5个月）。

尽管IMERG力求保障结果的一致性与准确性，但卫星降水估算在冰冻地表、复杂地形及沿海区域的估算精度仍相对偏低。此外，随时间推移发生变化的GPM卫星星座可能引入观测伪影，对关注多年变化的研究造成干扰。

本数据集为GPM 3级IMERG最终运行版半小时降水数据（空间分辨率0.1°×0.1°，数据集编号GPM_3IMERGHH），以毫米每小时为单位，呈现原生半小时分辨率的降水率最终估算结果。完整的全球“降水”数据场除极地少数网格单元外均覆盖完全，但仅使用微波观测的“微波降水”数据场中缺失值较为普遍。

如需获取完整的数据集摘要与更多信息，请参见NASA地球科学数据信息中心（NASA GES DISC）的官方GPM IMERG站点[https://disc.gsfc.nasa.gov/datasets/GPM_3IMERGHH_07/summary]。

搜集汇总

背景与挑战

背景概述

该数据集是NASA GPM任务的Level 3 IMERG Final Run降水分析数据，提供0.1度空间分辨率和半小时时间分辨率的全球降水率估计。数据覆盖2000年6月至2025年9月，适用于全球尺度的降水研究，尤其适用于缺乏地面观测数据的地区。