MODIS/Terra Aerosol 5-Min L2 Swath 10km (Collection 004 and 005)
MODIS was launched aboard the Terra satellite on December 18, 1999
(10:30 am equator crossing time) as part of NASA's Earth Observing
System (EOS) mission. MODIS with its 2330 km viewing swath width
provides almost daily global coverage. It acquires data in 36 high
spectral resolution bands between ... 0.415 to 14.235 micron with spatial
resolutions of 250m(2 bands), 500m(5 bands),and 1000m (29
bands). MODIS sensor counts, calibrated radiances, geolocation
products and all derived geophysical atmospheric and ocean products
are archived at NASA Goddard DAAC and has been made available to
public since April 2000.
The MODIS level-2 atmospheric aerosol 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.
The shortname for this level-2 MODIS aerosol product is MOD04_L2 and
the principal investigators for this product are MODIS scientists:
Dr. Yoram Kaufman for aerosol retrieval over land, and Dr. Didier
Tanre (firstname.lastname@example.org) for aerosol retrieval over ocean.
The MODIS aerosol product (MOD04_L2) contains global data that has a
spatial resolution of 10-km (at nadir). Each MOD04_L2 product file
covers a five-minute time interval. The output grid is 135 pixels in
width by 203 pixels in length. Every tenth file has an output grid
size of 135 by 204 pixels. MOD04_L2 product files are stored in
Hierarchical Data Format (HDF-EOS). The file consists of 53 pixel
level gridded aerosol parameters. These pixel level gridded aerosol
parameters are stored as Scientific Data Sets(SDS) within the
file. Each file is roughly 10.46 MB in size, and the total data volume
is approximately 1.44 GB/day.
MODIS Data Category & Parameters
Spatial & Temporal Resolution:
scan start time
Solar and Sensor Viewing Geometry:
solar zenith angle, solar azimuth angle
sensor zenith angle, sensor azimuth angle
Aerosol Parameters for Land & Ocean (Combined)
aerosol optical depth (0.55 micron) over land and ocean
Aerosol Parameters from Ocean Retrieval Algorithm (best/average
Aerosol Particle Properties:
effective optical depth at 7 bands (0.47,0.55,0.66,0.87,1.24,1.64,2.13
effective radius (based on 0.55 micron)
optical depth for small & large particles
ratio of small mode optical depth relative to total for 0.55 micron
mass concentration & cloud condensation nuclei (based on 0.55 micron)
Angstrom exponents 1 (based on 0.55 and 0.865 micron)
Angstrom exponent 2 (based on 0.865 and 2.13 micron)
asymmetry factor & back scattering ratio at 7 bands
solution indices for small & large modes
Aerosol Parameters from Land Retrieval Algorithm:
aerosol type, continental optical depth
corrected optical depth, mass concentration;
Angstrom exponent and dust weighting factor
Aerosol Derived Radiation Parameters from both Algorithms (Land & Ocean):
reflected flux, transmitted flux
mean reflectance & uncertainty
Quality Assurance & Statistical Parameters from both Algorithms(land &
quality assurance flag, cloud mask, cloud fraction,
number of pixels used, least square error
These aerosol parameters will be used to study aerosol climatology,
sources and sinks of specific aerosol types (e.g. sulfates and biomass
burning aerosol), interaction of aerosols with clouds, and atmospheric
corrections of remotely sensed surface reflectance over the land. This
product will also be used to monitor aerosol mass concentration,
aerosol optical properties, and radiative forcing on a global scale.
See the MODIS Science Team homepage for more data set
visit the MODIS Atmosphere Team homepage:
Access Collection 4 MOD04_L2 directly though the LAADS FTP site
Horizontal Resolution Range:
10 km - < 50 km or approximately .09 degree - < .5 degree
Temporal Resolution Range:
1 minute - < 1 hour
The 'version 004' or 'collection 004' product is better than 'version
003' and earlier versions. The quality of this version 004 product is
... established as 'Validated' . This means its accuracy has been
assessed over a widely distributed set of locations and time periods
via several ground-truth and validation efforts. Results are peer-reviewed
and published at scientific conferences and workshops.For the latest
information please see:
Available to public to gain familiarity with the data format and
This Data set (version 004/collection 004) is of 'Validated'
Quality. This data is appropriate for use in scientific publications.
... Before using it in any publication please the contact science team
representative for the known problems and updates.
gang.ye at sigmaspace.com
301-731-2917, 1-866-506-6347 (toll-free - US only)
modapsuso at sigmaspace.com
LAADS User Support Team
4801 Forbes Boulevard
Province or State:
33 (0) 320337033
33 (0)3 20 43 43 42
tanre at loa.univ-lille1.fr
Laboratorie d'Optique Atmospherique
Bat. P5, U.S.T. deLille
Villeneuve d'Ascq Cedex
Chu, D. A., K. Strabala, S. Platnick, E. Moody, M. King, S. Mattoo,
R. Hucek, and B. Ridgway, 2000: MODIS Atmosphere QA Plan. Version 2.2
,NASA Goddard Space Flight Center, 46 pp.
Chu, D. A., Y. J. Kaufman, L. A. Remer, and B. N. Holben,1998: Remote
sensing of smoke from MODIS ... Airborne Simulator during SCAR-B
experiment. Journal of Geophysical Research, 103, 31979-31988.
Gao, B.-C., and Y. J. Kaufman, 1995: Selection of the 1.375-m
MODIS channelfor remote sensing of cirrus clouds and stratospheric
aerosols from space, J. Atm. Sci., 52, 4231-4237.
Kaufman, Y. J., and D. Tanre,1998: Algorithm For Remote Sensing of
Tropospheric Aerosol from MODIS,Algorithm Theoretical Basis Document,
ATBD-MOD-02, NASA Goddard Space Flight Center,85 pp.
Kaufman, Y. J., and D. Tanre,1997: MODIS Aerosol Product, in MTPE EOS
Data Products Handbook,107-108.
Kaufman, Y. J., and R. S. Fraser, 1997: The effect of smoke particles
on cloudsand climate forcing. Science, 277, 1636-1639.
Kaufman, Y. J., D. Tanre, L. Remer, E. F.Vermote, A. Chu, &
B. N. Holben, 1997: Operational remote sensing of tropospheric aerosol
over the land from EOS-MODIS. Journal of Geophysical Research,
King, M., Y. Kaufman, P. Menzel, D.Tanre, B. Gao, 1999: MODIS
Atmosphere Validation Plan, NASA Goddard Space Flight Center, 48 pp.
King, M. D., W. P. Menzel, P. S. Grant, J. S. Myers, G. T. Arnold,
S. E. Platnick, L. E.Gumley, S. C. Tsay, C. C. Moeller,
M. Fitzgerald, K. S. Brown and F. G.Osterwisch, 1996: Airborne
scanning spectrometer for remote sensing of cloud, aerosol, water
vapor and surface properties. J. Atmos. Oceanic Technol.,13,
Remer, L. A., Y. J. Kaufman, and B. N. Holben, 1996: The size
distribution of ambient aerosol particles: Smoke vs. urban/industrial
aerosol. Global biomass burning. Cambridge MA: MIT Press.
Tanre, D., Y. J. Kaufman, M. Herman, and S. Mattoo, 1997: Remote
sensing of aerosol properties over oceans using the MODIS/EOS spectral
radiances. Journal of Geophysical Research, 102, 16971-16988.
Tanre, D., M. Herman, and Y. J. Kaufman, 1996: Information on aerosol
size distribution contained in solar reflected radiances. Journal of
Geophysical Research-Atmospheres, 101, 19043-19060.
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