Table · collection · 2019
MODIS/Terra+Aqua BRDF/Albedo Gap-Filled Snow-Free Daily L3 Global 30ArcSec CMG V006
Listed in NASA Earthdata CMR and NASA Data Portal — shown once because both records carry DOI 10.5067/modis/mcd43gf.006
Description
The Daily Moderate Resolution Imaging Spectroradiometer (MODIS) Bidirectional Reflectance Distribution Function and Albedo (BRDF/Albedo) 30 arc second, Global Gap-Filled, Snow-Free, (MCD43GF) Version 6 is derived from the 30 arc second Climate Modeling Grid (CMG) MCD43D Version 6 product suite, with additional processing to provide a gap-filled, snow-free product. The highest quality full inversion values were used for the temporal fitting effort and supplemented with lower quality pixels, spatial fitting, and spatial smoothing as needed.
The status of each pixel can be found in the quality layer for each band. To generate a snow-free product, pixels with ephemeral snow were removed using the MCD43D41 snow flags. The underlying MCD43D utilizes a BRDF model derived from all available high quality cloud clear reflectance data over a 16 day moving window centered on and emphasizing the daily day of interest (the ninth day of each retrieval period as reflected in the Julian date in the filename).
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This 30 arc second BRDF model is then used to produce the Albedo and NBAR products (MCD43D). These BRDF model parameters are computed for MODIS spectral bands 1 through 7 (0.47 um, 0.55 um, 0.67 um, 0.86 um, 1.24 um, 1.64 um, 2.1 um), as well as the shortwave infrared band (0.3-5.0 um), visible band (0.3-0.7 um), and near-infrared (0.7-5.0 um) broad bands. The MCD43GF product includes 67 layers containing black-sky albedo (BSA) at local solar noon, isotropic model parameter (ISO), volumetric model parameter (VOL), geometric model parameter (GEO), quality (QA), Nadir BRDF-Adjusted Reflectance (NBAR) at local solar noon, and white-sky albedo (WSA).
Due to the large file size, each data layer is distributed as a separate HDF file. Users are encouraged to download the quality layers for each of the 10 bands to check quality assessment information before using the BRDF/Albedo data. The MCD43 product is not recommended for solar zenith angles beyond 70 degrees.
Users are urged to use the band specific quality flags to isolate the highest quality full inversion results for their own science applications as described in the User Guide.
Known Issues
* There is an error in the DataFieldName value in the metadata. This affects bands 2-7 for the years 2000-2004 and 2013.
- The incorrect representation of the aerosol quantities (low average high) in the C6 MYD09 and MOD09 surface reflectance products may have impacted downstream products particularly over arid bright surfaces. This (and a few other issues) have been corrected for C6.1. Therefore users should avoid substantive use of the C6 MCD43 products and wait for the C6.1 products. In any event, users are always strongly encouraged to download and use the extensive QA data provided in MCD43A2, in addition to the briefer mandatory QAs provided as part of the MCD43A1, 3, and 4 products.
- For complete information about the MCD43GF known issues refer to the MODIS Land Quality Assessment website.
Links
Get the data
- Resource doi.org/10.5067/modis/mcd43gf.006 ↗
The LP DAAC product page provides information on Science Data Set layers and links for user guides, ATBDs, data access, tools, customer support, etc.
landing page · download · DOI / persistent id · from NASA CMR, data nasa gov
- PDF lpdaac.usgs.gov/documents/97/MCD43_ATBD.pdf ↗
The ATBD provides physical theory and mathematical procedures for the calculations used to produce the data products.
documentation · download · from NASA CMR, data nasa gov
- Resource landweb.modaps.eosdis.nasa.gov ↗
The LDOPE Land Product Quality Assessment website provides known issues, maneuvers, and product quality of the land products.
documentation · download · from NASA CMR, data nasa gov
- Resource umb.edu/spectralmass/modis-user-guide-v006-and-v0061/mcd43gf-cmg-gap-f… ↗
The technical information in the User's Guide enables users to interpret and use the data products.
documentation · download · from NASA CMR, data nasa gov
- Original Metadata cmr.earthdata.nasa.gov/search/concepts/C2763297158-LPCLOUD.iso19115 ↗
download · from data nasa gov
- search.earthdata.nasa.gov /search?q=C2763297158-LPCLOUD ↗
Earthdata Search allows users to search, discover, visualize, refine, and access NASA Earth Observation data.
download · from NASA CMR
- Resource earthdata.nasa.gov/centers/lp-daac ↗
The LP DAAC website provides detailed information on discovery, distribution, access, and support of land data products.
download · project · from data nasa gov, NASA CMR
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/modis-terraaqua-brdf-albedo-gap-filled-snow-free-daily… ↗
landing page · from data nasa gov
Catalogue records · 3
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C2763297158-LPCLOUD.umm_json ↗
metadata API · from NASA CMR
- CKAN API data.nasa.gov/api/3/action/package_show?id=7c7ab822-bd11-47f2-8e7c-976ce588a… ↗
metadata API · from data nasa gov
- CMR record cmr.earthdata.nasa.gov/search/concepts/C2763297158-LPCLOUD.html ↗
catalogue entry · from NASA CMR
Topics
- Stated by source
- Albedo · Anisotropy · Earth Observing System, Aqua · Earth Observing System, Terra (AM-1) · Moderate-Resolution Imaging Spectroradiometer · Reflectance
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
- Inferred from text
- Imaging 75%
Provenance · 2 source records, 21 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C2763297158-LPCLOUD | 12 d ago | JSON v1 |
| NASA Data Portal | 7c7ab822-bd11-47f2-8e7c-976ce588a869 | 9 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:modis | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/surface-radiative-properties/albedo | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/surface-radiative-properties/anisotropy | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/surface-radiative-properties/reflectance | 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:aqua | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:terra | 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 · NASA CMR | connector:nasa_cmr@1.0.0 | |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |