Array · collection · 2024
VIIRS/NOAA21 Cloud Mask and Spectral Test Results 6-Min L2 Swath 750 m
Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/viirs/cldmsk_l2_viirs_noaa21.001
The National Oceanic and Atmospheric Administration (NOAA-21) Visible Infrared Imaging Radiometer Suite (VIIRS) NASA Level-2 (L2) Cloud Mask is one of four continuity products designed to sustain the long-term records of both Moderate Resolution Imaging Spectroradiometer (MODIS) and VIIRS heritages.
Description
CLDMSK_L2_VIIRS_NOAA21 is the shortname for the NOAA-21 VIIRS incarnation of the Cloud Mask continuity product derived from the MODIS-VIIRS cloud mask (MVCM) algorithm, which itself is based on the MODIS (MOD35) algorithm.
MVCM describes a continuity algorithm that is central to both MODIS data (from Terra and Aqua missions) and VIIRS data (from Suomi National Polar-orbiting Partnership (SNPP) and Joint Polar Satellite System (JPSS) missions). Upon becoming operational, the JPSS missions are renamed with a “NOAA” moniker followed by a series number, e.g., “NOAA-21” as in the case of this product. Please bear in mind that the term MVCM does not appear as an attribute within the product's metadata.
Read the rest (2 more)
Implemented to consistently handle MODIS and VIIRS inputs, the NOAA-21 VIIRS v1.0 collection products use calibration-adjusted NASA VIIRS L1B as inputs. The nominal spatial resolution of the NOAA-21 VIIRS L2 Cloud mask is 750 meters. The L2 netCDF product, acquired and processed every 5 minutes, contains the following three data groups and Science Data Set (SDS) layers in each group: Geophysical data
- VIIRS Clear Sky Confidence
- VIIRS Cloud Mask and Spectral Test Results
- VIIRS Integer Cloud Mask
- Quality Assurance for VIIRS Cloud Mask Geolocation data
- Latitudes of pixel locations
- Longitudes of pixel locations
- Sensor azimuth angle at pixel locations
- Sensor zenith angle at pixel locations
- Solar azimuth angle at pixel locations
- Solar zenith angle at pixel locations Scanline attributes
- Scan start time (TAI93) Consult the MODIS-VIIRS Cloud Mask Product User Guide for additional information regarding the transition from the MODIS-MOD35 to the MVCM algorithm, inputs to MVCM, output files, file naming conventions, quality flags, and validation. Users are also encouraged to consult the MOD35 Algorithm Theoretical Basis Document (ATBD) and the MODIS Atmosphere QA Plan for relevant information that are applicable to the NOAA-21 VIIRS Cloud Mask product.
Links
Get the data
- Data product's landing page doi.org/10.5067/viirs/cldmsk_l2_viirs_noaa21.001 ↗
landing page · download · DOI / persistent id · from NASA CMR, data nasa gov
- Resource ladsweb.modaps.eosdis.nasa.gov/opendap/RemoteResources/laads/allData/5110/CLDMSK_L2_VIIRS_NOA… ↗
Direct access to CLDMSK_L2_VIIRS_NOAA21 OPeNDAP data set.
metadata API · download · from NASA CMR, data nasa gov
- Product User's Guide atmosphere-imager.gsfc.nasa.gov/sites/default/files/ModAtmo/MVCM_User_Guide_01Oct2020.pdf ↗
documentation · download · from NASA CMR, data nasa gov
- Original Metadata cmr.earthdata.nasa.gov/search/concepts/C3206162112-LAADS.iso19115 ↗
download · from data nasa gov
- Search and order products from LAADS website. ladsweb.modaps.eosdis.nasa.gov/search/order/1/CLDMSK_L2_VIIRS_NOAA21--5110 ↗
download · from NASA CMR
- search.earthdata.nasa.gov /search/granules?p=C3206162112-LAADS ↗
Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data.
download · from NASA CMR
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/viirs-noaa21-cloud-mask-and-spectral-test-results-6-mi… ↗
landing page · from data nasa gov
Catalogue records · 3
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C3206162112-LAADS.umm_json ↗
metadata API · from NASA CMR
- CKAN API data.nasa.gov/api/3/action/package_show?id=d384260b-f350-4eae-ac89-8aec40654… ↗
metadata API · from data nasa gov
- CMR record cmr.earthdata.nasa.gov/search/concepts/C3206162112-LAADS.html ↗
catalogue entry · from NASA CMR
Topics
- Stated by source
- Cloud Frequency · Cloud Properties · Clouds · Cloud Top Height · Infrared Radiance · Joint Polar Satellite System - 2 · Reflected Infrared · Visible-Infrared Imager-Radiometer Suite · Visible Radiance
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Engineering · Ocean & Atmospheric Science · Physics
- Inferred from text
- Imaging 75%
Provenance · 2 source records, 25 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C3206162112-LAADS | 8 d ago | JSON v1 |
| NASA Data Portal | d384260b-f350-4eae-ac89-8aec406542a3 | 5 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:engineering | 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:viirs | 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[measured_variable].gcmd:earth-science/atmosphere/clouds/cloud-properties | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/clouds/cloud-properties/cloud-frequency | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/atmosphere/clouds/cloud-properties/cloud-top-height | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/infrared-wavelengths/infrared-radiance | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/infrared-wavelengths/reflected-infrared | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/spectral-engineering/visible-wavelengths/visible-radiance | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[modality].local:modality:imaging | enrichment · NASA CMR | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[platform].gcmd_platform:noaa-21 | 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 · data nasa gov | connector:data_nasa_gov@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 · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |