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Towards Better Utilization of NEXRAD Data in Hydrology: anOverview of Hydro-NEXRAD

机译：努力更好地利用NEXRAD数据在水文学中：Hydro-NEXRAD概述

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With a very modest investment in computer hardware and the open source local datamanger (LDM) software from UCAR's Unidata Program Center, an individual researchercan receive a variety of NEXRAD Level III gridded rainfall products, and theunprocessed Level II data in real-time from most NEXRAD radars. Additionally, theNational Climatic Data Center has vast archives of these products and Level II data.Still, significant obstacles remain in order to unlock the full potential of the data. One setof obstacles is related to effective management of multi-terrabyte data sets: storing,compressing, and backing up. A second set of obstacles, for hydrologists andhydrometeorologists in particular, is that the NEXRAD Level III products are not wellsuited for application in hydrology. There is a strong need for the generation of highqualityproducts directly from the Level II data with well-documented steps that includequality control, removal of false echoes, rainfall estimation algorithms with variety ofcorrections, coordinate conversion and georeferencing, conversion to a convenient dataformat(s), and integration with GIS. For hydrologists it is imperative that theseprocedures are basin-centered as opposed to radar-centered. Thirdly, the amount of datapresent in a multi-year, multi-radar dataset is such that simple cataloging and indexing ofthe data is not sufficient. Rather, sophisticated metadata extraction and managementtechniques are required. The authors describe and discuss the Hydro-NEXRAD softwaresystem that addresses the above three challenges. With support from the NationalScience Foundation through its ITR program, the authors are developing a basin-centeredframework for addressing all these issues in a comprehensive manner, tailoredspecifically for use of NEXRAD data in hydrology and hydrometeorology. Through aflexible web interface users can search a large metadata database base, managed by a relational database, for subsets of interest. Well-chosen and documented defaults areprovided for the flow from unprocessed NEXRAD data to basin-centered rainfallestimates at a desired space-time resolution. In addition to the web interface, there areweb services that provide access to scripts and compiled programs.
机译：只需对计算机硬件和开源本地数据进行少量投资 来自UCAR的Unidata计划中心的经理（LDM）软件，一名个人研究员 可以接收各种NEXRAD III级网格式降雨产品，并且 大多数NEXRAD雷达可实时处理未经处理的II级数据。此外， 国家气候数据中心拥有这些产品和II级数据的大量存档。 尽管如此，为了释放数据的全部潜力，仍然存在重大障碍。一套 障碍与有效管理多terrabyte数据集有关：存储， 压缩并备份。第二套障碍，对水文学家和 特别是水文气象学家，NEXRAD Level III产品并不理想 适用于水文学。产生高质量的需求非常强烈 直接从II级数据中获得产品，并有详细记录的步骤，其中包括 质量控制，消除误回波，各种降雨估计算法 校正，坐标转换和地理配准，转换为方便的数据 格式，并与GIS集成。对于水文学家来说，当务之急是 程序以盆地为中心，而不是以雷达为中心。第三，数据量 存在于多年的，多雷达的数据集中，这样就可以对 数据不足。而是进行复杂的元数据提取和管理 技术是必需的。作者描述并讨论了Hydro-NEXRAD软件 解决以上三个挑战的系统。在国家队的支持下 科学基金会通过其ITR计划，作者正在开发一个以盆地为中心的 量身定制的全面解决所有这些问题的框架 专门用于将NEXRAD数据用于水文学和水文气象学。通过一个 灵活的Web界面用户可以在由关系数据库管理的大型元数据数据库中搜索感兴趣的子集。精心选择和记录的默认值是 提供了从未处理的NEXRAD数据到以盆地为中心的降雨的流量 以所需的时空分辨率进行估算。除了网络界面外，还有 提供对脚本和编译程序的访问的Web服务。

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