MODIS/Aqua Aerosol 5-Min L2 Swath 3km V006

Metadata Updated: August 9, 2018

The MODIS/Aqua Aerosol 5-Min L2 Swath 3km (MYD04_3K) product provides retrieved ambient aerosol optical properties (e.g., optical thickness and size distribution), mass concentration, look-up table derived reflected and transmitted fluxes, as well as quality assurance and other ancillary parameters, globally over ocean and near globally over land. In Collection 5 (C5), and earlier collections, there was only one aerosol product (MYD04_L2) at 10km at nadir spatial resolution. For Collection 6 (C6), the Dark Target (DT) Aerosol algorithm team now provides a new 3 km spatial resolution product intended for the air quality community. The Shortname for this product is MYD04_3K.

The MYD04_3K product is based on the same algorithm and using the same Look Up Tables as the standard Dark Target aerosol product. Because of finer resolution, subtle differences are made in selecting pixels for retrieval and in determining QA. The only differences between the existing 10km algorithm and the new 3km algorithm are: 1) the size of the pixel-arrays defining each retrieval box (used 6x6 retrieval boxes of 36 pixels at 0.5km resolution for 3km algorithm as oppose to 20x20 retrieval boxes of 400 pixels at 0.5km resolution used for 10km product); 2) the minimum percentage of "good" pixels required for a retrieval (required a minimum of 5 pixels over ocean and 6 pixels over land instead of a minimum of 10 pixels over ocean or 12 pixels over land for (more for high quality) 10km product retrieval); 3) the 10km algorithm attempts a "poor quality" retrieval while 3km algorithm does not. Everything else is the same between both products.

Recommendations:

Global studies should continue to make use of the more robust and well-studied 10 km product. The 3 km product's use should be restricted to obvious situations that require finer resolution.

Only the AOD at 550 nm has been studied in depth at this point. Difference in AOD at wavelengths, and differences in the size parameters over ocean are possible. More validation will be forthcoming.

Aerosol-cloud studies with the 3 km product should proceed cautiously. At this time, we do not specifically know how the 3 km product is affected in the proximity of clouds.

While the air quality community will be eager to apply the 3 km product across an urban landscape, this must proceed cautiously because of known artifacts in the product over urban surfaces.

The power of the 3 km product is on local, not global, scales.

See the MODIS Science Team homepage for more data set information:

https://modis-atmos.gsfc.nasa.gov/Webinar2014/MODIS_Atmos_Webinar-2_Munchak_3kmaerosol.pdf

or, visit the MODIS Atmosphere Team homepage for 10km product information:

https://modis-atmos.gsfc.nasa.gov/products/aerosol

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

References

https://modis-atmos.gsfc.nasa.gov/sites/default/files/ModAtmo/ATBD_MOD04_C005_rev2.pdf
https://ladsweb.modaps.eosdis.nasa.gov
https://ladsweb.modaps.eosdis.nasa.gov/archive/allData/6/MYD04_3K/

Dates

Metadata Created Date August 9, 2018
Metadata Updated Date August 9, 2018

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 9, 2018
Metadata Updated Date August 9, 2018
Publisher Not provided
Unique Identifier C204690560-LAADS
Maintainer
ASAD ULLAH
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id 91c0a3bd-255a-42dd-bcbe-4027c250173c
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2014-01-01T00:00:00.000Z
Language en-US
Metadata Type geospatial
Data Last Modified 2018-04-04T00:00:00Z
Program Code 026:001
Publisher Hierarchy U.S. Government > National Aeronautics and Space Administration > Not provided
Related Documents https://modis-atmos.gsfc.nasa.gov/sites/default/files/ModAtmo/ATBD_MOD04_C005_rev2.pdf, https://ladsweb.modaps.eosdis.nasa.gov, https://ladsweb.modaps.eosdis.nasa.gov/archive/allData/6/MYD04_3K/
Source Datajson Identifier True
Source Hash d38ac2d6ecd51e051b4cd768d87a22b3bdd9c01e
Source Schema Version 1.1
Spatial -180.0 -90.0 180.0 90.0
Temporal 2002-07-04T00:00:00Z/2018-04-04T00:00:00Z
Category AQUA, geospatial

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