DSCOVR EPIC Level 1B Version 3

Description

Deep Space Climate Observatory (DSCOVR) Earth Polychromatic Imaging Camera (EPIC) is a 10-channel spectro-radiometer (317 – 780 nm) onboard National Oceanic and Atmospheric Administration's (NOAA) DSCOVR spacecraft located at the Earth-Sun Lagrange-1 (L-1) point giving EPIC a unique angular perspective that is used in science applications to measure ozone, aerosols, cloud reflectivity, cloud height, vegetation properties, and ultraviolet (UV) radiation estimates at Earth's surface. EPIC provides ten narrow-band spectral images of the entire sunlit face of the Earth using a 2048x2048 pixel Charge Coupled Device (CCD) detector coupled to a 30-cm aperture Cassegrain telescope. EPIC collects radiance data from the Earth and other sources through the Camera/Telescope Assembly. EPIC has a field of view (FOV) of 0.62 degrees, sufficient to image the entire Earth. Because of DSCOVR's tilted (Lissajous) orbit about the L‐1 point, the apparent angular size of the Earth varies from 0.45 to 0.53 degrees within its 6-month orbital period. Depending on the season, a complete set of per-band images is taken every 60 to 100 minutes. Accompanying instrument metadata and a series of calibrations and corrections are applied to convert the images to Level 1A format properly. The significant corrections are for flat‐fielding and stray light. Flat-fielding is based on measurements with a uniform light source to measure the differences in sensitivity for each of the 4 million pixels. The resulting correction map is applied to the estimated counts from the CCD. Stray light was measured in the laboratory using a series of small-diameter light sources entering the telescope and imaged on the CCD. A similar set of measurements has been performed on orbit using the moon. The illumination of pixels outside the primary diameter of the light source was measured to produce a detailed matrix map of the entire stray light function, and the resulting stray light correction was applied to every image. Other corrections are also used based on laboratory measurements. For wavelengths longer than 550 nm, there are back-to-front interference effects in the partially transparent CCD (etaloning) that must also be removed from measured radiance. The Level 1B products contain calibrated and geolocated EPIC images with ancillary metadata. These data products are in HDF5 format.

Resources

Name Format Description Link
5 https://asdc.larc.nasa.gov%2Fproject%2FDSCOVR
5 https://search.earthdata.nasa.gov%2Fsearch%2Fgranules%3Fp%3DC1667168435-LARC_ASDC
5 https://doi.org%2F10.5067%2FEPIC%2FDSCOVR%2FL1B.003
5 https://asdc.larc.nasa.gov%2Fciting-data
5 https://asdc.larc.nasa.gov%2Fdocuments%2Fdscovr%2FDSCOVR_EPIC_Calibration_Factors_V03.pdf
5 https://asdc.larc.nasa.gov%2Fdocuments%2Fdscovr%2FDSCOVR_EPIC_Data_Format_Control_Book_V03.pdf
5 https://asdc.larc.nasa.gov%2Fdocuments%2Fdscovr%2FDSCOVR_EPIC_Geolocation_Quality_V03.pdf
5 https://asdc.larc.nasa.gov%2Fdocuments%2Fdscovr%2FDSCOVR_EPIC_Geolocation_V03.pdf
5 https://asdc.larc.nasa.gov%2Fdocuments%2Fdscovr%2FDSCOVR_EPIC_L0_L1A_Processing_V03.pdf
5 https://epic.gsfc.nasa.gov%2F
5 https://asdc.larc.nasa.gov%2Fstatic%2Fimages%2Fproject_logos%2Fdscovr.png
5 https://asdc.larc.nasa.gov%2Fdata%2FDSCOVR%2FEPIC%2FL1B%2F
5 https://opendap.larc.nasa.gov%2Fopendap%2FDSCOVR%2FEPIC%2FL1B%2Fcontents.html
5 https://www.eoportal.org%2Fsatellite-missions%2Fdscovr
5 https://asdc.larc.nasa.gov/project/DSCOVR
5 https://www.eoportal.org/satellite-missions/dscovr
5 https://search.earthdata.nasa.gov/search/granules?p=C1667168435-LARC_ASDC
21 L1B.003 https://doi.org/10.5067/EPIC/DSCOVR/L1B.003
5 https://asdc.larc.nasa.gov/citing-data
33 DSCOVR_EPIC_Calibration_Factors_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_Calibration_Factors_V03.pdf
33 DSCOVR_EPIC_Data_Format_Control_Book_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_Data_Format_Control_Book_V03.pdf
33 DSCOVR_EPIC_Geolocation_Quality_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_Geolocation_Quality_V03.pdf
33 DSCOVR_EPIC_L0_L1A_Processing_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_L0_L1A_Processing_V03.pdf
5 https://asdc.larc.nasa.gov/data/DSCOVR/EPIC/L1B/
21 contents.html https://opendap.larc.nasa.gov/opendap/DSCOVR/EPIC/L1B/contents.html
5 https://epic.gsfc.nasa.gov/science/products/vis
33 EPICSO2_L2_summary_final.pdf https://asdc.larc.nasa.gov/documents/dscovr/EPICSO2_L2_summary_final.pdf
21 amt-11-177-2018-discussion.html https://www.atmos-meas-tech.net/11/177/2018/amt-11-177-2018-discussion.html
33 EPIC_Data_Format_Control_Book_2016-07-01.pdf https://asdc.larc.nasa.gov/documents/dscovr/EPIC_Data_Format_Control_Book_2016-07-01.pdf
5 https://www.nasa.gov/image-feature/nasa-captures-epic-earth-image
5 https://x.com/NASAGoddard/status/676462280469553154
5 https://blogs.nasa.gov/leadership/2015/07/20/dscovrs-first-light-on-the-future/
5 https://www.nasa.gov/press-release/nasa-studies-high-clouds-saharan-dust-from-epic-view
5 https://dotearth.blogs.nytimes.com/2015/07/21/from-a-million-miles-away-a-new-nasa-blue-marble-view-of-earth
5 https://www.theatlantic.com/technology/archive/2015/07/our-new-and-daily-view-of-the-blue-marble/399011/
5 https://earthobservatory.nasa.gov/images/85273/plumes-from-africas-volcanic-duo
5 https://earthobservatory.nasa.gov/images/86865/no-longer-just-for-astronauts
5 https://earthobservatory.nasa.gov/blogs/earthmatters/2016/04/
5 https://earthobservatory.nasa.gov/blogs/earthmatters/2016/04/05/2016-tournament-earth-champion-the-dark-side-of-the-moon/
5 page4.php https://earthobservatory.nasa.gov/features/IndonesianFires/page4.php
5 https://earthobservatory.nasa.gov/images/87167/keeping-on-the-sunny-side-of-earth
5 https://earthobservatory.nasa.gov/images/86353/the-dark-side-and-the-bright-side
5 https://earthobservatory.nasa.gov/images/86257/an-epic-new-view-of-earth
5 https://earthobservatory.nasa.gov/images/85288/up-up-and-away-for-dscovr
5 https://earthobservatory.nasa.gov/images/87675/an-epic-eclipse
5 https://www.ncdc.noaa.gov/wct/
5 https://www.noaa.gov/
33 DSCOVR_overview_2016-06-29.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_overview_2016-06-29.pdf
5 https://medium.com/@ObamaWhiteHouse/a-new-blue-marble-39c2fe1b5b3c?
5 https://search.earthdata.nasa.gov/search/granules?p=C1969999465-LARC_ASDC
21 L2_MAIAC.002 https://doi.org/10.5067/EPIC/DSCOVR/L2_MAIAC.002
5 https://asdc.larc.nasa.gov/data/DSCOVR/EPIC/L2_MAIAC_02/
21 contents.html https://opendap.larc.nasa.gov/opendap/DSCOVR/EPIC/L2_MAIAC_02/contents.html
5 https://search.earthdata.nasa.gov/search/granules?p=C1667168435-LARC_ASDC
5 L1B.003 https://doi.org/10.5067/EPIC/DSCOVR/L1B.003
33 DSCOVR_EPIC_Calibration_Factors_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_Calibration_Factors_V03.pdf
33 DSCOVR_EPIC_Data_Format_Control_Book_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_Data_Format_Control_Book_V03.pdf
33 DSCOVR_EPIC_Geolocation_Quality_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_Geolocation_Quality_V03.pdf
33 DSCOVR_EPIC_Geolocation_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_Geolocation_V03.pdf
33 DSCOVR_EPIC_L0_L1A_Processing_V03.pdf https://asdc.larc.nasa.gov/documents/dscovr/DSCOVR_EPIC_L0_L1A_Processing_V03.pdf
5 https://epic.gsfc.nasa.gov/
34 dscovr.png https://asdc.larc.nasa.gov/static/images/project_logos/dscovr.png
5 https://asdc.larc.nasa.gov/data/DSCOVR/EPIC/L1B/
21 contents.html https://opendap.larc.nasa.gov/opendap/DSCOVR/EPIC/L1B/contents.html
0 The metadata's original source. https://cmr.earthdata.nasa.gov/search/concepts/C1667168435-LARC_ASDC.iso19115

Tags

  • earth-science-solar-activity-sun-earth-interactions-solar-irradiance
  • earth-science-atmospheric-radiation-atmosphere-solar-irradiance
  • earth-science-atmospheric-radiation-atmosphere

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