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Dataset

 

MYD06_L2 - MODIS/Aqua Clouds 5-Min L2 Swath 1km and 5km

Update Frequency: As Needed
Latest Data Update: 2023-06-18
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2021-04-15
Download Stats: last 12 months
Dataset Size: 2.24M Files | 119TB
Abstract

These data are a copy of MODIS data from the NASA Level-1 and Atmosphere Archive & Distribution System (LAADS) Distributed Active Archive Center (DAAC). The copy is potentially only a subset. Below is the description from https://ladsweb.modaps.eosdis.nasa.gov/missions-and-measurements/products/MYD06_L2

The MODIS Level-2 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 for the retrieval of cloud particle phase (ice vs. water, clouds vs. snow). The shortname for this Level-2 MODIS cloud product is MYD06_L2. MYD06_L2 consists of parameters at a spatial resolution of either 1km or 5km (at nadir). Each MYD06_L2 product file covers a 5-minute time interval. This means that for 5km resolution parameters, the output grid is 270 pixels wide 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.

MYD06_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 the cloud top properties are retrieved at night.

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 1km spatial resolution.

For additional details see the MODIS Atmospheres web site page onCollection 6.1 Updates.

Shortname: MYD06_L2 , Platform: Aqua , Instrument: MODIS , Processing Level: Level-2 , Spatial Resolution: 1 km , Temporal Resolution: 5 minute , ArchiveSets: 61 , Collection: MODIS Collection 6.1 - Level 1, Atmosphere, Land (ArchiveSet 61) , PGE Number: PGE06 , File Naming Convention: MYD06_L2.AYYYYDDD.HHMM.CCC.YYYYDDDHHMMSS.hdf AYYYYDDD = Acqusition Year and Day of Year HHMM = Hour and Minute of acquisition CCC = Collection number YYYYDDDHHMMSS = Production Date and Time AYYYYDDD = Year and Day of Year of acquisition , Citation: Platnick, S., Ackerman, S., King, M., et al., 2015. MODIS Atmosphere L2 Cloud Product (06_L2). NASA MODIS Adaptive Processing System, Goddard Space Flight Center, USA: http://dx.doi.org/10.5067/MODIS/MYD06_L2.061 , Keywords: Water Vapor, Precipitable Water

Citable as:  National Aeronautics and Space Administration (2021): MYD06_L2 - MODIS/Aqua Clouds 5-Min L2 Swath 1km and 5km. National Aeronautics and Space Administration, date of citation. https://catalogue.ceda.ac.uk/uuid/b5e81b4a2be145b990ae3b8e198f9266
Abbreviation: MYD06_L2
Keywords: Water Vapor, Precipitable Water

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence: https://modaps.modaps.eosdis.nasa.gov/services/faq/LAADS_Data-Use_Citation_Policies.pdf. When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data were downloaded from https://ladsweb.modaps.eosdis.nasa.gov/archive/allData/ to support UK research groups, especially NCEO.
Data Quality:
Look on the data source site (https://ladsweb.modaps.eosdis.nasa.gov) for quality information
File Format:
HDF

Related Documents

 LAADS DAAC - Search for Product Files
 LAADS DAAC - Data Archive
 File Specification
 LAADS DAAC DOI: 10.5067/MODIS/MYD06_L2.061

Process overview

This dataset was generated by instruments deployed on platforms as listed below.

Mobile platform operations

Mobile Platform Operation 1 Aqua Satellite orbit details
Output Description

None
  • units: unitless
  • var_id: cloud_emiss11_1km
  • long_name: 11 micron Cloud Emissivity at 1-km resolution from LEOCAT for All Clouds
  • units: unitless
  • var_id: cloud_emiss12_1km
  • long_name: 12 micron Cloud Emissivity at 1-km resolution from LEOCAT for All Clouds
  • units: unitless
  • var_id: cloud_emiss13_1km
  • long_name: 13.3 micron Cloud Emissivity at 1-km resolution from LEOCAT for All Clouds
  • units: unitless
  • var_id: cloud_emiss85_1km
  • long_name: 8.5 micron Cloud Emissivity at 1-km resolution from LEOCAT for All Clouds
  • units: cm
  • var_id: Above_Cloud_Water_Vapor_094
  • long_name: Above-cloud water vapor amount from 0.94um channel, ocean only, tau > 5.
  • units: none
  • var_id: Atm_Corr_Refl
  • long_name: Atmospherically corrected reflectance used during cloud optical and microphysical properties retrieval
  • var_id: Radiance_Variance
  • long_name: Band 31 Radiance Standard Deviation
  • units: Watts/meter2/steradian/micron
  • units: none
  • var_id: Cirrus_Reflectance
  • long_name: Cirrus Reflectance
  • units: none
  • var_id: Cirrus_Reflectance_Flag
  • long_name: Cirrus Reflectance Flag
  • units: none
  • var_id: Cloud_Effective_Emissivity
  • long_name: Cloud Effective Emissivity from Cloud Top Pressure Retrieval
  • units: none
  • var_id: Cloud_Effective_Emissivity_Nadir
  • long_name: Cloud Effective Emissivity from Cloud Top Pressure Retrieval for Sensor Zenith (View) Angles <= 32 Degrees
  • units: none
  • var_id: Cloud_Effective_Emissivity_Nadir_Day
  • long_name: Cloud Effective Emissivity from Cloud Top Pressure Retrieval for Sensor Zenith (View) Angles <= 32 Degrees, Day Data Only
  • units: none
  • var_id: Cloud_Effective_Emissivity_Nadir_Night
  • long_name: Cloud Effective Emissivity from Cloud Top Pressure Retrieval for Sensor Zenith (View) Angles <= 32 Degrees, Night Data Only
  • units: none
  • var_id: Cloud_Effective_Emissivity_Day
  • long_name: Cloud Effective Emissivity from Cloud Top Pressure Retrieval, Day Only
  • units: none
  • var_id: Cloud_Effective_Emissivity_Night
  • long_name: Cloud Effective Emissivity from Cloud Top Pressure Retrieval, Night Only
  • units: unitless
  • var_id: cloud_emissivity_1km
  • long_name: Cloud Emissivity at 1-km resolution from LEOCAT Cloud Top Pressure Retrieval
  • units: none
  • var_id: Cloud_Fraction
  • long_name: Cloud Fraction in Retrieval Region (5x5 1-km Pixels) from 1-km Cloud Mask
  • units: none
  • var_id: Cloud_Fraction_Nadir
  • long_name: Cloud Fraction in Retrieval Region (5x5 1-km Pixels) from 1-km Cloud Mask for Sensor Zenith (View) Angles <= 32 Degrees
  • units: none
  • var_id: Cloud_Fraction_Nadir_Day
  • long_name: Cloud Fraction in Retrieval Region (5x5 1-km Pixels) from 1-km Cloud Mask for Sensor Zenith (View) Angles <= 32 Degrees, Day Data Only
  • units: none
  • var_id: Cloud_Fraction_Nadir_Night
  • long_name: Cloud Fraction in Retrieval Region (5x5 1-km Pixels) from 1-km Cloud Mask for Sensor Zenith (View) Angles <= 32 Degrees, Night Data Only
  • units: none
  • var_id: Cloud_Fraction_Day
  • long_name: Cloud Fraction in Retrieval Region (5x5 1-km Pixels) from 1-km Cloud Mask, Day Only
  • units: none
  • var_id: Cloud_Fraction_Night
  • long_name: Cloud Fraction in Retrieval Region (5x5 1-km Pixels) from 1-km Cloud Mask, Night Only
  • units: none
  • var_id: Cloud_Multi_Layer_Flag
  • long_name: Cloud Multi Layer Identification From MODIS Shortwave Observations
  • units: none
  • var_id: Cloud_Optical_Thickness_1621
  • long_name: Cloud Optical Thickness two-channel retrieval using band 7(2.1um) and band 6(1.6um)from best points: not failed in any way, not marked for clear sky restoral
  • units: none
  • var_id: Cloud_Optical_Thickness_1621_PCL
  • long_name: Cloud Optical Thickness two-channel retrieval using band 7(2.1um) and band 6(1.6um)from points identified as either partly cloudy from 250m cloud mask test or 1km cloud edges
  • units: micron
  • var_id: Cloud_Effective_Radius_1621
  • long_name: Cloud Particle Effective Radius two-channel retrieval using band 7(2.1um) and band 6(1.6um)from best points: not failed in any way, not marked for clear sky restoral
  • units: none
  • var_id: Cloud_Phase_Optical_Properties
  • long_name: Cloud Phase Determination Used in Optical Thickness/Effective Radius Retrieval
  • units: none
  • var_id: Cloud_Phase_Infrared_1km
  • long_name: Cloud Phase at 1-km resolution from 8.5- 11 um BTDs and cloud emissivity ratios (12/11, 8.5/11, and 7.2/11 um)
  • units: none
  • var_id: Cloud_Phase_Infrared
  • long_name: Cloud Phase from 8.5 and 11 um Bands
  • units: none
  • var_id: Cloud_Phase_Infrared_Day
  • long_name: Cloud Phase from 8.5 and 11 um Bands, Day Only
  • units: none
  • var_id: Cloud_Phase_Infrared_Night
  • long_name: Cloud Phase from 8.5 and 11 um Bands, Night Only
  • units: meters
  • var_id: cloud_top_height_1km
  • long_name: Cloud Top Height at 1-km resolution from LEOCAT, Geopotential Height at Retrieved Cloud Top Pressure Level rounded to nearest 50 m
  • units: hPa
  • var_id: Cloud_Top_Pressure
  • long_name: Cloud Top Pressure Level (rounded to nearest 5 mb)
  • units: hPa
  • var_id: Cloud_Top_Pressure_Nadir
  • long_name: Cloud Top Pressure Level for Sensor Zenith (View) Angles <= 32 Degrees (rounded to nearest 5 mb)
  • units: hPa
  • var_id: Cloud_Top_Pressure_Nadir_Day
  • long_name: Cloud Top Pressure Level for Sensor Zenith (View) Angles <= 32 Degrees (rounded to nearest 5 mb), Day Data Only
  • units: hPa
  • var_id: Cloud_Top_Pressure_Nadir_Night
  • long_name: Cloud Top Pressure Level for Sensor Zenith (View) Angles <= 32 Degrees (rounded to nearest 5 mb), Night Data Only
  • units: hPa
  • var_id: Cloud_Top_Pressure_Day
  • long_name: Cloud Top Pressure Level, Day Only (rounded to nearest 5 mb)
  • units: hPa
  • var_id: Cloud_Top_Pressure_Night
  • long_name: Cloud Top Pressure Level, Night Data Only (rounded to nearest 5 mb)
  • units: hPa
  • var_id: Cloud_Top_Pressure_From_Ratios
  • long_name: Cloud Top Pressure Levels from Ratios of Bands 36/35, 35/34, 35/33, 34/33 from the CO2-slicing Algorithm
  • units: hPa
  • var_id: cloud_top_pressure_1km
  • long_name: Cloud Top Pressure at 1-km resolution from LEOCAT, Cloud Top Pressure Level rounded to nearest 5 mb
  • units: hPa
  • var_id: Cloud_Top_Pressure_Infrared
  • long_name: Cloud Top Pressure from IR Window Retrieval
  • units: K
  • var_id: cloud_top_temperature_1km
  • long_name: Cloud Top Temperature at 1-km resolution from LEOCAT, Temperature from Ancillary Data at Retrieved Cloud Top Pressure Level
  • units: g/m^2
  • var_id: Cloud_Water_Path_1621
  • long_name: Column Water Path two-channel retrieval using band 7(2.1um) and band 6(1.6um)from best points: not failed in any way, not marked for clear sky restoral
  • units: g/m^2
  • var_id: Cloud_Water_Path_1621_PCL
  • long_name: Column Water Path two-channel retrieval using band 7(2.1um) and band 6(1.6um)from points identified as either partly cloudy from 250m cloud mask test or 1km cloud edges
  • units: percent
  • var_id: Cloud_Mask_SPI
  • long_name: Dispersion in bands 1 (plane 1) and 2 (plane 2) from 250m reflectance statistics of cloud mask
  • units: none
  • var_id: Cloud_Mask_5km
  • long_name: First Byte of MODIS Cloud Mask Plus Additional Stats for L3 (2nd Byte)
  • units: degrees_north
  • var_id: Latitude
  • long_name: Geodetic Latitude
  • units: degrees_east
  • var_id: Longitude
  • long_name: Geodetic Longitude
  • units: meters
  • var_id: Cloud_Top_Height
  • long_name: Geopotential Height at Retrieved Cloud Top Pressure Level (rounded to nearest 50 m)
  • units: meters
  • var_id: Cloud_Top_Height_Nadir
  • long_name: Geopotential Height at Retrieved Cloud Top Pressure Level for Sensor Zenith (View) Angles <=32 Degrees (rounded to nearest 50 m)
  • units: meters
  • var_id: Cloud_Top_Height_Nadir_Day
  • long_name: Geopotential Height at Retrieved Cloud Top Pressure Level for Sensor Zenith (View) Angles <=32 Degrees, Day Data Only (rounded to nearest 50 m)
  • units: meters
  • var_id: Cloud_Top_Height_Nadir_Night
  • long_name: Geopotential Height at Retrieved Cloud Top Pressure Level for Sensor Zenith (View) Angles <=32 Degrees, Night Data Only (rounded to nearest 50 m)
  • var_id: Statistics_1km_sds
  • long_name: Granule Statistics for parameters at 1x1 resolution
  • units: see description attribute
  • units: none
  • var_id: Asymmetry_Parameter_Ice
  • long_name: Ice Asymmetry Parameter from the phase functions used to generate the forward lookup tables
  • units: none
  • var_id: Extinction_Efficiency_Ice
  • long_name: Ice Extinction Efficiency from the phase functions used to generate the forward lookup tables
  • units: none
  • var_id: Single_Scatter_Albedo_Ice
  • long_name: Ice single scatter albedo from the phase functions used to generate the forward lookup tables
  • units: none
  • var_id: Cloud_Height_Method
  • long_name: Index Indicating MODIS Bands Used for Cloud Top Pressure Retrieval
  • units: unitless
  • var_id: cloud_top_method_1km
  • long_name: Index Indicating the MODIS Band(s) Used to Produce the Cloud Top Pressure Result
  • units: none
  • var_id: IRP_CTH_Consistency_Flag_1km
  • long_name: Indicates Cloud_Phase_Infrared_1km results changed to ice from water when cloud_top_method_1km reports valid band 36/35 CO2-slicing result (1=change)
  • units: none
  • var_id: Asymmetry_Parameter_Liq
  • long_name: Liquid Water Asymmetry Parameter from the phase functions used to generate the forward lookup tables
  • units: none
  • var_id: Extinction_Efficiency_Liq
  • long_name: Liquid Water CE from the phase functions used to generate the forward lookup tables
  • units: none
  • var_id: Single_Scatter_Albedo_Liq
  • long_name: Liquid Water single scatter albedo from the phase functions used to generate the forward lookup tables
  • units: K
  • var_id: IRW_Low_Cloud_Temperature_From_COP
  • long_name: Low Cloud Temperature from IR Window retrieval using cloud emissivity based on cloud optical thickness
  • units: none
  • var_id: Cloud_Mask_1km
  • long_name: MODIS Cloud Mask, L2 MOD06 QA Plan
  • units: K
  • var_id: Brightness_Temperature
  • long_name: Observed Brightness Temperature from Cloudy Averaged Radiances in a 5x5 1-km Pixel Region
  • units: none
  • var_id: Quality_Assurance_1km
  • long_name: Quality Assurance at 1x1 Resolution
  • units: none
  • var_id: Quality_Assurance_5km
  • long_name: Quality Assurance at 5x5 Resolution
  • var_id: Retrieval_Failure_Metric_1621
  • long_name: Retrievals and other information for points that failed to retrievevia standard solution logic for retrieval using band 6 and band 7
  • units: by plane in order: 1-none, 2-micron, 3-percent
  • units: degrees
  • var_id: Sensor_Azimuth
  • long_name: Sensor Azimuth Angle, Cell to Sensor
  • units: degrees
  • var_id: Sensor_Azimuth_Day
  • long_name: Sensor Azimuth Angle, Cell to Sensor, Day Data Only
  • units: degrees
  • var_id: Sensor_Azimuth_Night
  • long_name: Sensor Azimuth Angle, Cell to Sensor, Night Data Only
  • units: degrees
  • var_id: Sensor_Zenith
  • long_name: Sensor Zenith Angle, Cell to Sensor
  • units: degrees
  • var_id: Sensor_Zenith_Day
  • long_name: Sensor Zenith Angle, Cell to Sensor, Day Data Only
  • units: degrees
  • var_id: Sensor_Zenith_Night
  • long_name: Sensor Zenith Angle, Cell to Sensor, Night Data Only
  • units: degrees
  • var_id: Solar_Azimuth
  • long_name: Solar Azimuth Angle, Cell to Sun
  • units: degrees
  • var_id: Solar_Azimuth_Day
  • long_name: Solar Azimuth Angle, Cell to Sun, Day Data Only
  • units: degrees
  • var_id: Solar_Azimuth_Night
  • long_name: Solar Azimuth Angle, Cell to Sun, Night Data Only
  • units: degrees
  • var_id: Solar_Zenith
  • long_name: Solar Zenith Angle, Cell to Sun
  • units: degrees
  • var_id: Solar_Zenith_Day
  • long_name: Solar Zenith Angle, Cell to Sun, Day Data Only
  • units: none
  • var_id: Solar_Zenith_Night
  • long_name: Solar Zenith Angle, Cell to Sun, Night Data Only
  • units: Watts/meter2/steradian/micron
  • var_id: Spectral_Cloud_Forcing
  • long_name: Spectral Cloud Forcing (cloud minus clear radiance)
  • units: hPa
  • var_id: Surface_Pressure
  • long_name: Surface Pressure from Ancillary Data
  • units: K
  • var_id: surface_temperature_1km
  • long_name: Surface Temperature for Each 1-km MODIS Pixel Interplated from Ancillary Data
  • units: K
  • var_id: Surface_Temperature
  • long_name: Surface Temperature from Ancillary Data
  • units: seconds
  • var_id: Scan_Start_Time
  • long_name: TAI time at start of scan replicated across the swath
  • units: K
  • var_id: Cloud_Top_Temperature
  • long_name: Temperature from Ancillary Data at Retrieved Cloud Top Pressure Level
  • units: K
  • var_id: Cloud_Top_Temperature_Nadir
  • long_name: Temperature from Ancillary Data at Retrieved Cloud Top Pressure Level for Sensor Zenith (View) Angles <= 32 Degrees
  • units: K
  • var_id: Cloud_Top_Temperature_Nadir_Day
  • long_name: Temperature from Ancillary Data at Retrieved Cloud Top Pressure Level for Sensor Zenith (View) Angles <= 32 Degrees, Day Data Only
  • units: K
  • var_id: Cloud_Top_Temperature_Nadir_Night
  • long_name: Temperature from Ancillary Data at Retrieved Cloud Top Pressure Level for Sensor Zenith (View) Angles <= 32 Degrees, Night Data Only
  • units: K
  • var_id: Cloud_Top_Temperature_Day
  • long_name: Temperature from Ancillary Data at Retrieved Cloud Top Pressure Level, Day Only
  • units: K
  • var_id: Cloud_Top_Temperature_Night
  • long_name: Temperature from Ancillary Data at Retrieved Cloud Top Pressure Level, Night Only
  • units: hPa
  • var_id: Tropopause_Height
  • long_name: Tropopause Height from Ancillary Data
  • units: none
  • var_id: os_top_flag_1km
  • long_name: Upper Tropospheric/Lower Stratospheric (UTLS) Cloud Flag at 1-km resolution - valid from -50 to +50 Degrees Latitude

Co-ordinate Variables

Coverage
Temporal Range
Start time:
2002-07-03T23:55:00
End time:
Ongoing
Geographic Extent

 
90.0000°
  
-180.0000°
  
180.0000°
 
-90.0000°
  
Related parties
Authors (1)
Publishers (1)
Principal Investigators (1)