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  • 1
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    Subsetting Satellite Level 2 Data at NASA GES DISC (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Working with Level 2 satellite swath data can prove challenging for many users. The variety of metadata, high resolution, and orbit-based nature of such data makes it difficult to acquire and manage. The NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) has developed a general-purpose Level 2 Subsetting service that facilitates access to Level 2 data products. The Level 2 Subsetter enables users to sub-sample swath and gridded data in a variety of ways: by location (in a lat/lon box, within a circle of given radius, or at a specific point), by time (via swath segments or collections of granules), by any nonspatial dimension, or by selecting specific variables. The Level 2 Subsetting service also allows users to specify output data configuration and file format. In this presentation, we will detail and demonstrate the capabilities of this new service.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN64658 , American Geophysical Union (AGU) Fall Meeting; Dec 10, 2018 - Dec 14, 2018; Washington, DC; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Long-Term Model Assimilated Aerosols from MERRA-2: Data and Services at NASA GES DISC (2016)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2) is the atmospheric reanalysis conducted with NASA assimilation system GEOS-5. Alongside the meteorological data assimilation, MERRA-2 includes an interactive analysis of aerosols, land, ocean, and ice that feed back into circulation.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN32746 , LCULC Spring Science Team Meeting; Apr 18, 2016 - Apr 19, 2016; Bethesda, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Using GES DISC Data to Study Kilauea Volcano of 2018 (2019)
    In:  CASI
    Details
    Publication Date: 2019-12-31
    Description: Kilauea volcano in Hawaii which erupted in early May 2018 injected massive amount of SO2 and ash into the atmosphere. The lava flow during the eruption destroyed many home and neighborhoods. The SO2 plume during the eruption of Kilauea volcano is analyzed from May to August 2018 using multiple satellite products such as Level 2 TROPspheric Monitoring Instrument (TROPOMI) and Level 3 Ozone Monitoring Instrument (OMI) from the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). GES DISC hosts multi-disciplinary Earth science data sets that can be used to analyze natural disasters, such as the Kilauea volcano. Additionally, GES DISC's Giovanni tool can be used to visualize these data. We acquired OMI through the subsetting function, which is processed by the GES DISC in-house developed backend software Level3/4 Regrider and Subsetter (L34RS) and TROPOMI using OPeNDAP.Data from the OMI OMSO2e product showed elevated levels of SO2 amounts during the eruption between May to August 2018. Similarly, ground-based stations at Hawaii Volcanoes National Park recorded higher SO2 concentrations during the same time period. This study uses wind direction from Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2) to analyze the transport and dispersion of SO2 plume and map lava flows from the volcano using thermal images from Visible Infrared Imaging Radiometer Suite (VIIRS). Furthermore, satellite observations combined with socioeconomic and public health data are used to analyze its impact in public health.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN76459 , AGU 2019 Fall Meeting; Dec 09, 2019 - Dec 13, 2019; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Long Term Potential Evapotranspiration and Evapotranspiration Data and Services at NASA GES DISC (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-01
    Description: Recently, the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) has released global land 3-hourly Potential Evapotranspiration and Supporting Forcing Data Version-1 (PET_PU_3H025.001), at 0.25x0.25 degree spatial resolution, spanning the 23 year period from 1984 to 2006. The Version-2 will be released in the near future, covering longer time period. This dataset was generated by Professor Justin Sheffield through NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) project. Potential evapotranspiration (PET) is a representation of the environmental demand for evapotranspiration (ET). ET and PET are important part of the global water cycle estimation, and are also critical to advance our understanding of the climate system. NASA GES DISC archives and distributes various global and regional ET datasets from several projects, for example, Land Data Assimilation System (LDAS), Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2), other MEaSUREs Projects, such as Land Surface Atmospheric Boundary Interaction Product by William Rossow; and SRB/GEWEX evapotranspiration (Penman-Monteith) by Eric F. Wood. In this presentation, we will overview all available PET and ET datasets and services at GES DISC. As examples, climatology and some seasonal characteristics of PET and selected ET will be shown. The data can be accessed from NASA GES DISC (https://disc.gsfc.nasa.gov/) by searching keyword "evapotranspiration".
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN76453 , AGU Fall Meeting; Dec 09, 2019 - Dec 13, 2019; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Streamlining Access to Satellite Level 2 Data (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-03
    Description: Users wishing to work with Satellite Level 2 data often have to overcome many hurdles: various file format standards, large files containing hundreds of variables, inconsistent presentation of geospatial and temporal variables, inhomogeneous data structures, and nonlinear spatial geometry. The Level 2 Subsetting service at NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) has many options to streamline and simplify user access to this data. In this presentation, we will detail the capabilities of this service and demonstrate how users can incorporate it into their Level 2 data workflow.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN76813 , IN51A-03 , AGU 2019 Fall Meeting; Dec 09, 2019 - Dec 13, 2019; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Simplifying Satellite and Ground Data Validation with Level-2 Subsetting (2019)
    In:  CASI
    Details
    Publication Date: 2020-01-03
    Description: We demonstrate that scientists can simplify their satellite data validation workflow with the use of NASA Godddard Earth Sciences Data and Information Services Center (GES DISC) subsetting services. We perform a sample validation of Aura ozone products collocated with ground-based ozone measurements using subsetting services to trim satellite data to only the relevant user-defined variables and spatio-temporal region. Because the subsetting service automatically returns only relevant data granules that adhere to a set of user-defined coincidence criteria, user workload is greatly reduced. Moreover, the resultant data files are substantially smaller than full data granules due to the subsetting service further culling the data to the relevant geospatio-temporal coincidence criteria, user-defined variables, and user-defined dimensions of variables. This decreases data download throughput and file storage requirements. The validation presented here quantifies the time and file size savings that can be achieved by utilizing subsetting services within the satellite data validation workflow.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN76811 , A33L-2957 , AGU 2019 Fall Meeting; Dec 09, 2019 - Dec 13, 2019; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Satellite Level 3 & 4 Data Subsetting at NASA GES DISC (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Earth Science data are available in many file formats (NetCDF, HDF, GRB, etc.) and in a wide range of sizes, from kilobytes to gigabytes. These properties have become a challenge to users if they are not familiar with these formats or only want a small region of interest (ROI) from a specific dataset. At NASA Goddard Earth Sciences Data and Information Services Center (GES DISC), we have developed and implemented a multipurpose subset service to ease user access to Earth Science data. Our Level 3 & 4 Regridder is capable of subsetting across multiple parameters (spatially, temporally, by level, and by variable) as well as having additional beneficial features (temporal means, regridding to target grids, and file conversion to other data formats). In this presentation, we will demonstrate how users can use this service to better access only the data they need in the form they require.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN51386 , 2017 AGU Fall Meeting; Dec 11, 2017 - Dec 15, 2017; New Orleans, LA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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