GPM_3IMERGHHL_04

GPM IMERG Late Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V04 (GPM_3IMERGHHL) at GES DISC

Version 04 eng
  • Abstract
    This is the Level 3 IMERG Late Half Hourly 10 x 10 km V04 (GPM_3IMERGHHL). The Integrated Multi-satelliE Retrievals for GPM (IMERG) is the unified U.S. algorithm that provides the Day-1 multi-satellite precipitation product for the U.S. GPM team. The precipitation estimates from the various precipitation-relevant satellite passive microwave (PMW) sensors comprising the GPM constellation are computed using the 2014 version of the Goddard Profiling Algorithm (GPROF2014), then gridded, intercalibrated to the GPM Combined Instrument product, and combined into half-hourly 10x10 km fields. These are provided to both the Climate Prediction Center (CPC) Morphing-Kalman Filter (CMORPH-KF) Lagrangian time interpolation scheme and the Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks Cloud Classification System (PERSIANN-CCS) re-calibration scheme. In parallel, CPC assembles the zenith-angle-corrected, intercalibrated "even-odd" geo- IR fields and forward them to PPS for use in the CMORPH-KF Lagrangian time interpolation scheme and the PERSIANN-CCS computation routines. The PERSIANN-CCS estimates are computed (supported by an asynchronous re-calibration cycle) and sent to the CMORPH-KF Lagrangian time interpolation scheme. The CMORPH-KF Lagrangian time interpolation (supported by an asynchronous KF weights updating cycle) uses the PMW and IR estimates to create half-hourly estimates. The IMERG system is run twice in near-real time "Early" multi-satellite product ~4 hr after observation time and "Late" multi-satellite product ~12 hr after observation time, and once after the monthly gauge analysis is received, "Final", satellite-gauge product ~2 months after the observation month. The baseline is for the (near-)real-time Early and Late half-hour estimates to be calibrated with climatological coefficients that vary by month and location, while in the Final post-real-time run the multi-satellite half-hour estimates are adjusted so that they sum to a monthly satellite-gauge combination. In all cases the output contains multiple fields that provide information on the input data, selected intermediate fields, and estimation quality. In brief, the input precipitation estimates computed from the various satellite passive microwave sensors are intercalibrated to the GPM Combined Instrument product (because it is presumed to be the best snapshot GPM estimate), then "morphed" and combined with microwave precipitation-calibrated geo-IR fields, and adjusted with monthly surface precipitation gauge analysis data (where available) to provide half-hourly and monthly precipitation estimates on a 10-km grid over the domain 60 deg N-S. Precipitation phase is diagnosed using analyses of surface temperature, humidity, and pressure. The current period of record is mid-March 2014 to the present (delayed by about 2 months).
  • Purpose
    The Integrated Multi-Satellite Retrievals for GPM (IMERG) algorithm is designed to leverage the international constellation of precipitation-relevant satellites to create a long record of uniformly time/space gridded precipitation estimates for the globe. The algorithm is focused on creating the best estimate at each time step, meaning that it is not a Climate Data Record, although the ideal is as homogenous a record as possible.
  • Version Description
    Not provided

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    3

    Quality
    Quality is discussed in detial in the Technical Documentation (IMERG_doc.pdf)
    Collection Progress

    In Work

    Use Constraints
    The *data access policy* is "freely available" with three common-sense caveats: 1. The data set source should be acknowledged when the data are used, in the form: "The IMERG data were provided by the NASA/Goddard Space Flight Center's Mesoscale Atmospheric Processes Laboratory and PPS, which develop and compute IMERG as a contribution to GPM, and archived at the NASA [enter PPS or GES DISC]." 2. New users are urged to obtain their own current, clean copy from an official archive, rather than taking a version from a third party that might be damaged or out of date. 3. Errors and difficulties in the original datasets should be reported to the dataset creators. Access and format issues at third-party sites should be directed to their contacts.
    Access Constraints

    None

    Publication References
    • Publication reference title not provided
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Related URLs
    Science Keywords
    • EARTH SCIENCE
    • ATMOSPHERE
    • PRECIPITATION
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC PHENOMENA
    • CYCLONES
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC PHENOMENA
    • DROUGHT
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC PHENOMENA
    • HURRICANES
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC PHENOMENA
    • MONSOONS
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC PHENOMENA
    • STORMS
    • EARTH SCIENCE
    • ATMOSPHERE
    • ATMOSPHERIC PHENOMENA
    • TYPHOONS
    • EARTH SCIENCE
    • ATMOSPHERE
    • PRECIPITATION
    • PRECIPITATION AMOUNT
    • EARTH SCIENCE
    • ATMOSPHERE
    • PRECIPITATION
    • PRECIPITATION RATE
    • EARTH SCIENCE
    • ATMOSPHERE
    • PRECIPITATION
    • SOLID PRECIPITATION
    • SNOW
    • EARTH SCIENCE
    • ATMOSPHERE
    • PRECIPITATION
    • LIQUID PRECIPITATION
    • RAIN
Other Descriptive Keywords
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Ancillary Keywords
  • Atmosphere, Precipitation, Hydrology
ISO Topic Categories
  • CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Additional Attributes
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Acquisition Information Fields:

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Platforms
  • GPM
    Instruments
    • GMI
    • DPR
    • PR
    • TMI
    • AMSR-E
    • AMSR2
    • ATMS
    • MHS
    • SAPHIR
    • SSM/I
Projects
Project Short Name Campaigns Project Dates
GPM No campaigns listed. No dates provided.
EOSDIS No campaigns listed. No dates provided.
ESIP No campaigns listed. No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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Location Keywords
    • GEOGRAPHIC REGION
    • GLOBAL
    • GEOGRAPHIC REGION
    • GLOBAL LAND
    • GEOGRAPHIC REGION
    • GLOBAL OCEAN

Data Centers

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  • NASA/GSFC/SED/ESD/GCDC/GESDISC
    ARCHIVER
    Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

Data Contacts

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  • GEORGE
    Investigator
    GEORGE HUFFMAN

    NASA Goddard Space Flight Center
    Mailstop 612
    Greenbelt, MD 20771

  • ANDREY
    Metadata Author
    ANDREY SAVTCHENKO

    Distributed Active Archive Center Global Change Data Center
    Code 610.2
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

  • Data Center Contact
    GES DISC HELP DESK SUPPORT GROUP

    NASA/GSFC/SED/ESD/GCDC/GESDISC

    Goddard Earth Sciences Data and Information Services Center
    Code 610.2
    NASA Goddard Space Flight Center
    Greenbelt, MD 20771

    • Email
    • 301-614-5224
    • 301-614-5268

Collection Citations Fields:

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