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    • GPM DPR Ka Precipitation Profile 2A 1.5 hours 5 km V07 (GPM_2AKa) at GES DISC

    Metadata Updated: December 6, 2023

    Version 07 is the current version of the data set. Older versions will no longer be available and have been superseded by Version 07.

    The 2AKa algorithm provides precipitation estimates from the Ka radar of the Dual-Frequency Precipitation Radar on the core GPM spacecraft. The product contains two swaths of data corresponding to the scans of the Ka radar. The first swath contains matched scans (MS), which are intended to be co-aligned with the Ku-band instantaneous fields of view (IFOV). The second swath contains the high-sensitivity scans (HS), which are interleaved between the Ku/Ka-MS swaths. Both swaths are narrow and centered within the interior of the Ku swath. This is a single-frequency retrieval of precipitation; no information from the Ku radar is used. The retrievals are performed at each radar range bin along the slant path of the radar IFOV for each swath.

    This is a single-frequency retrieval that relies on Ka-band data only. While the dual-frequency retrieval should give better overall estimates, that algorithm requires co-aligned Ku-band data. This 2AKa product will be produced independently and would not be impacted by any operational issues with the Ku-band radar. The high sensitivity to smaller hydrometeors should result in precipitation estimates in lighter precipitation then the Ku-only data.

    It is important to note the difference between the single- and the dual-frequency (DF) algorithms. While this 2AKa dataset is a single-frequency retrieval, the DF algorithm employs both KuPR and KaPR L1B standard products as inputs. The DF algorithm cannot be executed unless both L1B products are available. Pixels observed by DPR can be categorized into three types: pixels in the inner swath of normal scans (observed both by KuPR and KaPR), pixels in the outer swath of normal scans (observed only by KuPR), and pixels in the interleaved scans (observed only by KaPR in the high-sensitivity mode). The KuPR algorithm is executed for pixels in both inner and outer swaths of normal scans. The KaPR algorithm is executed for pixels in the inner swath of normal scans and in the interleaved scans. The DF algorithm is executed for pixels of all the three kinds.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date December 1, 2022
    Metadata Updated Date December 6, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Graphic Preview

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date December 1, 2022
    Metadata Updated Date December 6, 2023
    Publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
    Maintainer
    Identifier C2179081525-GES_DISC
    Data First Published 2021-12-06
    Language en-US
    Data Last Modified 2021-12-06
    Category GPM, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation Toshio Iguchi, Robert Meneghini. 2021-12-10. GPM_2AKa. Version 07. GPM DPR Ka Precipitation Profile 2A 1.5 hours 5 km V07. Greenbelt, MD. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://doi.org/10.5067/GPM/DPR/Ka/2A/07. https://disc.gsfc.nasa.gov/datacollection/GPM_2AKa_07.html. Digital Science Data.
    Creator Toshio Iguchi, Robert Meneghini
    Data Presentation Form Digital Science Data
    Graphic Preview File https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/browse/GPM_2AKa.png
    Harvest Object Id ca25d857-3397-4ac5-8ef0-f781acfb30b3
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/GPM/DPR/Ka/2A/07
    Metadata Type geospatial
    Old Spatial -180.0 -70.0 180.0 70.0
    Program Code 026:001
    Release Place Greenbelt, MD
    Series Name GPM_2AKa
    Source Datajson Identifier True
    Source Hash ffca160992902312ce350864f519d4ebb1e370b7059faa01c7b7732be6eeb001
    Source Schema Version 1.1
    Spatial
    Temporal 2014-03-08T00:00:00Z/2023-03-01T00:00:00Z

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