DSCOVR Level 2
Entry Title: EPIC-view satellite composites for DSCOVR, Version 1
Entry ID: DSCOVR_EPIC_L2_COMPOSITE_01
Clouds Radiation Budget
Description
In DSCOVR_EPIC_L2_composite_01, cloud property retrievals from multiple imagers on low Earth orbit (LEO) satellites (including MODIS, VIIRS, and AVHRR) and geostationary (GEO) satellites (including GOES-13 and -15, METEOSAT-7 and -10, MTSAT-2, and Himawari-8) are used to generate the composite. All cloud properties were determined using a common set of algorithms, the Satellite ClOud and Radiation Property retrieval System (SatCORPS), based on the CERES cloud detection and retrieval system. Cloud properties from these LEO/GEO imagers are optimally merged together to provide a seamless global composite product at 5-km resolution by using an aggregated rating that considers five parameters (nominal satellite resolution, pixel time relative to the EPIC observation time, viewing zenith angle, distance from day/night terminator, and sun glint factor) and selects the best observation at the time nearest to the EPIC measurements. About 72% of the LEO/GEO satellite overpass times are within one hour of the EPIC measurements, while 92% are within two hours of the EPIC measurements. The global composite data are then remapped into the EPIC FOV by convolving the high-resolution cloud properties with the EPIC point spread function (PSF) defined with a half-pixel accuracy to produce the EPIC composite. PSF-weighted averages of radiances and cloud properties are computed separately for each cloud phase. Ancillary data (i.e. surface type, snow and ice map, skin temperature, precipitable water, etc.) needed for anisotropic factor selections are also included in the composite. These composite images are produced for each observation time of the EPIC instrument (typically 300 to 600 composites per month).
Resources and Documentation
DOWNLOAD SOFTWARE
NOAA's Weather and Climate Toolkit
GOTO WEB TOOL
DSCOVR EPIC Visualization Tool
PROFESSIONAL HOME PAGE
NOAA - National Climatic Data Center (NCDC)
VIEW RELATED INFORMATION
- Description of the DSCOVR/EPIC volcanic SO2 Level 2 Algorithm
ALGORITHM DOCUMENTATION
- ASDC Data and Information for DSCOVR
- Earth Observation Portal Page for DSCOVR Mission Information
GENERAL DOCUMENTATION
- EPIC level 1 A & B Calibration factors table
INSTRUMENT/SENSOR CALIBRATION DOCUMENTATION
- NASA Captures "EPIC" Earth Image Article from July 20, 2015
- NASA Studies High Clouds, Saharan Dust from EPIC View
- New York Times Blog "From a Million Miles Away, a New NASA ‘Blue Marble’ View of Earth" By Andrew C. Revkin
MICRO ARTICLE
- EPIC Data Format Control Book Specification July 1, 2016
PROCESSING HISTORY
PUBLICATIONS
- DSCOVR Earth Science Instrument Overview
REQUIREMENTS AND DESIGN
- NASA Goddard Twitter Page
USER FEEDBACK PAGE
Keywords
From GCMD Science Keywords:
- ATMOSPHERIC RADIATION
- CLOUD PROPERTIES
- CLOUD MICROPHYSICS
- SHORTWAVE RADIATION
- LONGWAVE RADIATION
- CLOUD DROPLET CONCENTRATION/SIZE > CLOUD MICROPHYSICS
- CLOUD HEIGHT > CLOUD PROPERTIES
- CLOUDS
- CLOUD TOP HEIGHT > CLOUD PROPERTIES
- CLOUD OPTICAL DEPTH/THICKNESS > CLOUD MICROPHYSICS
- Cloud Droplet Concentration
- Cloud Droplet Size
- Cloud Optical Depth
- Cloud Optical Thickness
- Longwave (LW) Radiation
- OLR (Outgoing Longwave Radiation)
- Shortwave (SW) Radiation
Data Distribution
File Format(s):
NetCDF-4
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Spatial Information

Spatial Coverage Type: Not provided
Horizontal Resolution Range: 500 km - < 1000 km or approximately 5 degrees - < 10 degrees
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian
Temporal Information
Temporal Coverage: 2015-06-12 - 2017-12-31