Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Skip to content
  • Feedback

    • OMPS-N20 NM PCA SO2 Step 1 Total Column 1-Orbit L2 Swath 17x13km

    Metadata Updated: April 24, 2025

    The OMPS-N20_NM_PCA_SO2 Step1 Total Column 1-Orbit L2 Swath 17x13km collection 1 product contains the retrieved sulfur dioxide (SO2) measured by the Ozone Mapping and Profiling Suite (OMPS) Nadir-Mapper (NM) sensor on the NOAA-20 (JPSS-1) satellite. The product is based on the NASA Goddard Space Flight Center principal component analysis (PCA) spectral fitting algorithm (Li et al., 2013, 2017) used to retrieve the SO2 total column amounts assuming different SO2 plume heights, including the boundary layer (lowest 1 km of the atmosphere), the lower (centered at 3 km), middle (centered at 8 km) and upper (centered at 13 km) troposphere, as well as the lower stratosphere (centered at 18 km).

    Each granule contains data from the daylight portion for a single orbit or about 50 minutes. Spatial coverage is global (-90 to 90 degrees latitude), and there are about 14 orbits per day each with a swath width of 2600 km. There are 104 pixels in the cross-track direction before February 13, 2019 with a pixel resolution of about 17 km x 17 km at nadir. Since then, the pixel resolution has been enhanced to 17 km x 13 km at nadir, with 140 pixels in the cross-track direction. The files are written using netCDF version 4.

    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

    References

    https://doi.org/10.5194/amt-10-1495-2017
    https://doi.org/10.5194/amt-10-445-2017
    https://doi.org/10.1002/2013GL058134
    https://doi.org/10.5194/amt-2020-186

    Dates

    Metadata Created Date December 13, 2023
    Metadata Updated Date April 24, 2025

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date December 13, 2023
    Metadata Updated Date April 24, 2025
    Publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
    Maintainer
    Identifier C2808692512-GES_DISC
    Data First Published 2023-10-25
    Language en-US
    Data Last Modified 2025-04-23
    Category NPP-JPSS, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 54b3431e-61ad-4ea0-a686-f173c308f55e
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/OMPS/OMPS_N20_NMSO2_PCA_L2_Step1.1
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 180.0 90.0
    Program Code 026:001
    Related Documents https://doi.org/10.5194/amt-10-1495-2017, https://doi.org/10.5194/amt-10-445-2017, https://doi.org/10.1002/2013GL058134, https://doi.org/10.5194/amt-2020-186
    Source Datajson Identifier True
    Source Hash a7788abbebc94c29bf80cb3b95babdfb21d1d640c115c8aa34e5ca1ea2490eda
    Source Schema Version 1.1
    Spatial
    Temporal 2018-01-16T00:00:00Z/2023-12-18T00:00:00Z

    Didn't find what you're looking for? Suggest a dataset here.