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Subject The 7th International Workshop for GPM Ground Validation

Dear Colleague,


The Global Precipitation Measurement (GPM) mission Core Observatory satellite was successfully launched from Tanegashima, Japan on February 28, 2014.  The GPM Core Observatory carries an advanced radar-radiometer system to unify and advance precipitation observations from a constellation of research and operational satellites provided by the United States, Japan, France, India, and the European community.  International science collaboration in GPM Ground Validation (GV) plays a vital role in assessing the quality and utility of satellite-based precipitation products in different climates and precipitation regimes, and in the testing and refining of precipitation remote sensing algorithms.  In a series of international planning workshops held in the United Kingdom, Taiwan, Brazil, Finland, Canada, and Italy GPM has established a framework for international GV science collaboration to support GPM pre-launch algorithm development and post-launch product evaluation.  In view of your expertise in precipitation science and measurements, we cordially invite you to participate in the 7th GPM International GV Workshop hosted by the Korean Meteorological Agency (KMA) in coordination with NASA’s Precipitation Measurement Missions Science Program. The workshop will be held 12 ~ 14 May, in Seoul, South Korea. 


The workshop will focus on the following themes:


  1. First-year post-launch assessments and future plans for assessment of satellite product and retrieval algorithms using GV measurements.

Radar and gauge network activities for GPM Level I-III product direct GV:

                                i.            Tier-1:  Research radar data collections

                              ii.            Tier-2:  Operational radar network products and application

                            iii.            Tier-3:  Gauge and other instrument network applications


  1. Physical validation and associated field campaign measurements including, but not limited to:

a.  Pre-Launch

    1. LPVEX: High latitude light rain and snow

    2. MC3E: Mid-latitude convective and stratiform rainfall

    3. GCPEX:  Falling snow

    4. CHUVA: Tropical rain systems, warm-rainfall

b.  Post-Launch

    1. IPHEx:  Warm-season mid-latitude precipitation in complex terrain

    2. OLYMPEX:  Mid-latitude cold season ocean and orographic


3.      Coordination of Integrated Validation Activities including, but not limited to:

a.    Regional Hydrologic Validation Activities

                                i.            HSAF

                              ii.            HyMEX

b.   Field Campaign overviews, status, results, and lessons learned:

                                i.            IFloodS: Mid-latitude warm-season rain and hydrology

                              ii.            IPHEX:  Mid-latitude warm-season orographic rain and hydrology

                            iii.            OLYMPEX: Cold-season ocean and coastal orographic precipitation, hydrology.

c.    Application of GPM and associated satellite data in integrated hydrologic modeling, prediction and water budget studies.



The sequence of International GV workshops has provided a working forum and programmatic framework to refine and coordinate international GV activities in support of the GPM mission. Participation in the workshops is by invitation only. Desired outcomes of the workshop include: (a) identification of primary datasets and methods to confirm GPM precipitation measurement requirements have been met at the end of the nominal three-year mission lifecycle (March, 2017); (b) Refined definitions, improved coordination, and implementation of GV measurement approaches for direct GV; (c) review and assessment of physical validation field efforts, lessons learned, and intrinsic value to algorithm development; (d) further definition and and prioritization of algorithm issues for future validation activities; (e) review of existing and new instrumentation, including measurement practices; (f) better understanding of methods to assess the uncertainty in and hydrologic utility of GPM satellite products, especially in the middle and high latitudes; (g) increased coordination of international field and measurement initiatives contributing to GPM GV objectives.


A workshop website will be established to provide online registration, updated logistic details, workshop agenda, and other related information as they become available.


We sincerely hope that we will have the benefit of your participation at this workshop and look forward to hearing from you at your earliest convenience.

Kind regards, 


7th International GPM Ground Validation Workshop Organizing Committee


Jinho Shin (KMA), Walter A. Petersen (NASA), Workshop Co-Chairs

Gail Skofronick-Jackson, NASA GPM Project Scientist

George Huffman, NASA GPM Deputy Project Scientist

Ramesh Kakar, NASA GPM Program Scientist