Imaging · collection · 2021
DSCOVR EPIC Level 2 GLINT
Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/epic/dscovr/l2_glint.001
DSCOVR_EPIC_L2_GLINT_01 is Version 1 of the Deep Space Climate Observatory (DSCOVR) Earth Polychromatic Imaging Camera (EPIC) Level 2 glint data product.
Description
This product indicates the presence of glint caused by the single scattering specular reflection of sunlight either from horizontally oriented ice crystals floating in clouds or from smooth, highly reflective water surfaces. Such glints can prevent accurate retrievals of atmospheric and surface properties using existing algorithms but can also be used to learn more about the glint-causing objects.
The glint detection algorithm relies on EPIC taking images at different wavelengths at slightly different times. For example, red images are taken about 4 minutes after blue images. During these few minutes, the Earth's rotation changes the scene's orientation by one degree, affecting whether EPIC observations at a specific wavelength will capture or miss the narrowly focused specular reflection from ice clouds or smooth water surfaces.
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As a result, sharp brightness differences between EPIC images taken a few minutes apart can identify glint signals. The glint product includes three parameters for each pixel in the part of EPIC images where the alignment of solar and viewing directions is suitable for sun glint observations: (1) The surface type flag shows whether the area of a pixel is covered mainly by water, desert, or non-desert land; (2) The glint angle—the angle between the actual EPIC view direction and the direction of looking straight into the specular reflection from a perfectly horizontal surface—tells how favorable the EPIC view direction is for glint detection and can help in estimating the distribution of ice crystal orientation; (3) The glint mask indicates whether or not glint has been detected.
Links
Get the data
- Resource doi.org/10.5067/epic/dscovr/l2_glint.001 ↗
DOI data set landing page for DSCOVR_EPIC_L2_GLINT_01
landing page · download · DOI / persistent id · from NASA CMR, data nasa gov
- How to cite ASDC data asdc.larc.nasa.gov/citing-data ↗
documentation · download · from NASA CMR, data nasa gov
- PDF asdc.larc.nasa.gov/documents/dscovr/guides/UserGuide_glintProduct_01.pdf ↗
VERSION 1 LEVEL 2 EPIC SUN GLINT PRODUCT: USER GUIDE
documentation · download · from NASA CMR, data nasa gov
- Original Metadata cmr.earthdata.nasa.gov/search/concepts/C3860110080-LARC_CLOUD.iso19115 ↗
download · from data nasa gov
- search.earthdata.nasa.gov /search/granules?p=C3860110080-LARC_CLOUD ↗
Earthdata Search for DSCOVR_EPIC_L2_GLINT_01 (NASA Application to search, discover, visualize, refine, and access NASA Earth Observation data)
download · from NASA CMR
- Virtual Directory for DSCOVR_EPIC_L2_GLINT_01 cmr.earthdata.nasa.gov/virtual-directory/collections/C3860110080-LARC_CLOUD ↗
download · from NASA CMR
- Resource epic.gsfc.nasa.gov ↗
download · project · from data nasa gov, NASA CMR
- PNG asdc.larc.nasa.gov/static/images/project_logos/dscovr.png ↗
download · preview image · from data nasa gov, NASA CMR
- Resource asdc.larc.nasa.gov/project/DSCOVR ↗
download · project · from data nasa gov, NASA CMR
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/dscovr-epic-level-2-glint-7313a ↗
landing page · from data nasa gov
Catalogue records · 3
- CKAN API data.nasa.gov/api/3/action/package_show?id=b1f6cb7a-8f23-4442-9263-2a686d8ec… ↗
metadata API · from data nasa gov
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C3860110080-LARC_CLOUD.umm_json ↗
metadata API · from NASA CMR
- CMR record cmr.earthdata.nasa.gov/search/concepts/C3860110080-LARC_CLOUD.html ↗
catalogue entry · from NASA CMR
Topics
- Stated by source
- Clouds · Deep Space Climate Observatory · Energetic Particle and Ion Composition (Geotail)
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
Provenance · 2 source records, 19 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C3860110080-LARC_CLOUD | 9 d ago | JSON v1 |
| NASA Data Portal | b1f6cb7a-8f23-4442-9263-2a686d8ec6a4 | 6 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:physics | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[instrument].gcmd_instrument:epic | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/clouds | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:image | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (65%) |
| concepts[modality].local:modality:imaging | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[platform].gcmd_platform:dscovr | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| created_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| publication_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| updated_date | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |