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MODIS/Terra Clouds 5-Min L2 Swath 1km and 5km V006
Entry ID: MOD06_L2


Summary
Abstract: The level-2 MODIS cloud product consists of cloud optical and physical parameters. These parameters are derived using remotely sensed infrared, visible and near infrared solar reflected radiances. MODIS infrared channel radiances are used to derive cloud top temperature, cloud top height, effective emissivity, cloud phase (ice vs. water, opaque vs. non-opaque), and cloud fraction under both daytime and nighttime conditions. MODIS visible radiances are used to derive cloud optical thickness and effective particle radius and cloud shadow effects. Near infrared solar reflected radiance provides additional information in the retrieval of cloud particle phase (ice vs. water, clouds vs. snow). The shortname for this level-2 MODIS cloud product is MOD06_L2.

MOD06_L2 consists of parameters at a spatial resolution of either 1- km or 5-km (at nadir). Each MOD06_L2 product file covers a five-minute time interval. This means that for 5-km resolution parameters, the output grid is 270 pixels in width by 406 pixels in length. Every tenth granule has an output grid size of 270 by 408 pixels. For 1-km resolution parameters, the output grid is 1354 pixels in width by 2030 pixels in length and every tenth granule has an output grid size of 1354 by 2040 pixels.

MOD06_L2 product files are stored in Hierarchical Data Format (HDF-EOS). All gridded cloud parameters are stored as Scientific Data Sets (SDS) within the file, except two (band number and statistics). These are stored as Vdata(table arrays). Approximately 288 files are produced daily. Nighttime files are smaller than their daytime counterparts since only cloud top properties are retrieved at night.

The Collection 6 cloud-top property product changes include new 1 km SDSs in addition to the legacy 5 km SDSs, and a new physical cloud height dataset. New 1 km products include cloud top pressure, IR cloud emissivity, cloud height, overshooting cloud top flag, and cloud phase. The 1 km IR phase product is generated using an updated algorithm while the other 1 km products were designed to be as similar as possible to the 5 km version.

And, the Collection 6 Cloud optical/microphysical product changes include expanded/improved pixel-level retrieval uncertainty calculations that are intended to be used in lieu of retrieval QA assignments that are no longer assigned (legacy QA bits are now set to a value of 3 for all successful retrievals). Retrievals are now attempted on a pixel flagged as likely to have a partly cloudy field of view by the so-called clear sky restoral algorithm introduced in C5 processing. Successful retrievals from this pixel population have similar SDS names as the non-flagged pixel population but with “_PCL” (for Partly CLoudy) appended to the end of the parameter name; an exception is the uncertainty SDSs where both PCL and non-PCL retrieval uncertainties are kept. Metrics for unsuccessful retrievals (those outside the look-up table solution space) are now provided as well (Retrieval_Failure_Metric_*). Finally, absolute retrievals are provided for the other visible and near-infrared (VNIR) and shortwave infrared band pairs (VNIR and 1.6 μm, VNIR and 3.7 μm) instead of as differences relative to the VNIR/2.1 μm retrieval. For more details regarding dataset changes read the document at http://modis-atmos.gsfc.nasa.gov/products_C006update.html.

MOD06_L2 Data Category & Parameters

Spatial and Temporal Resolution:
latitude,longitude
scan start time

Solar and Sensor Viewing Geometry:
Solar_Azimuth(daytime,nighttime,all), Solar_Zenith(daytime,nighttime,all), Sensor_Azimuth(daytime,nighttime,all), Sensor_Zenith(daytime,nighttime,all)

Cloud Top Parameters (5km):

Cloud_Effective_Emissivity_(Day, Night, Nadir, Nadir_Day,Nadir_Night, All), Cloud_Fraction_(Day, Night, Nadir, Nadir_Day,Nadir_Night, All), Cloud_Height_Method, Cloud_Phase_Infrared_(day, night, all), Cloud_Top_Height_(Day, Night, Nadir, Nadir_Day,Nadir_Night, All), cloud_top_method_1km, Cloud_Top_Pressure_From_Ratios, Cloud_Top_Pressure_Infrared, Cloud_Top_Pressure_(Day, Night, Nadir, Nadir_Day,Nadir_Night, All), Cloud_Top_Temperature_(Day, Night, Nadir, Nadir_Day,Nadir_Night, All)

Cloud Top Parameters (1km):
cloud_top_height_1km, cloud_top_pressure_1km, cloud_top_temperature_1km, , cloud_emiss(11, 12, 13, 85, All)_1km, IRW_Low_Cloud_Temperature_From_COP


Cloud Optical Properties (1km):
Above_Cloud_Water_Vapor_094, Cloud_Effective_Radius_(PCL, 16, 16_PCL,1621, 1621_PCL,37,37_PCL, All) , Cloud_Optical_Thickness_(PCL, 16, 16_PCL,1621, 1621_PCL,37,37_PCL, All), Cloud_Phase_Infrared_1km, Cloud_Phase_Optical_Properties, Cloud_Water_Path_(PCL, 16, 16_PCL,1621, 1621_PCL,37,37_PCL, All)

Radiation Parameters:
Radiance_Variance, Brightness_Temperature, Spectral_Cloud_Forcing, Surface_Pressure, Surface_Temperature, surface_temperature_1km, Atm_Corr_Refl, Cirrus_Reflectance


Quality Assurance Parameters:
Processing flag for 5 km resolution, Cloud_Multi_Layer_Flag, cirrus reflectance flag for 1 km resolution, quality assurance flag for 1 and 5 km resolution, Retrieval_Failure_Metric_(16,1621,37, All), Cloud_Optical_Thickness_Uncertainty_(16,1621,37, All), Cloud_Water_Path_Uncertainty_(16,1621,37, All), Cloud_Effective_Radius_Uncertainty_(16,1621,37, All), cloud mask for 1km, 5km, and SPI, radiance variance for thermal bands, statistics for parameters at 1km resolution


The MODIS Cloud Product will be used to investigate seasonal and inter-annual changes in cirrus (semi-transparent) global cloud cover and cloud phase with multispectral observations at high spatial (1 kilometer) resolution.

For more information about the MOD06_L2 product, visit the MODIS-Atmosphere site at:
http://modis-atmos.gsfc.nasa.gov/MOD06_L2/
or
See the MODIS Science Team homepage for more data set
information at: http://modis.gsfc.nasa.gov/data/dataprod/


Purpose: Science Research

Related URL
Link: View Related Information
Description: Overview of MODIS Atmosphere Collection 6 Data Products


Link: View Related Information
Description: Overview of MOD06_L2


Link: View Related Information
Description: MODIS Atmosphere Data Availability Calendar and Validation Level


Link: View Related Information
Description: Known Data Issues


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Version: 6


Temporal Coverage
Start Date: 1999-12-18


Science Keywords
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD FREQUENCY    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD ASYMMETRY    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD CEILING    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD CONDENSATION NUCLEI    [Definition]
ATMOSPHERE >CLOUDS >CLOUD RADIATIVE TRANSFER >CLOUD EMISSIVITY    [Definition]
ATMOSPHERE >CLOUDS >CLOUD RADIATIVE TRANSFER >CLOUD RADIATIVE FORCING    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD HEIGHT    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD LIQUID WATER/ICE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD PRECIPITABLE WATER    [Definition]
ATMOSPHERE >CLOUDS >CLOUD RADIATIVE TRANSFER >CLOUD REFLECTANCE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD TOP PRESSURE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD TOP TEMPERATURE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD TYPES    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD VERTICAL DISTRIBUTION    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD DROPLET CONCENTRATION/SIZE    [Definition]
ATMOSPHERE >CLOUDS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >ATMOSPHERIC EMITTED RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >EMISSIVITY    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >RADIATIVE FLUX    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >REFLECTANCE    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >TRANSMITTANCE    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
HEALTH


Platform
Terra >Earth Observing System, TERRA (AM-1)    [Information]


Instrument
MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]


Data Set Progress
IN WORK



Creation and Review Dates
DIF Creation Date: 2012-07-02
Last DIF Revision Date: 2016-02-18



Link to Web Site