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CALIPSO - Data User's Guide - IIR Level 2 Swath Product

Version 3 release (V3.01 and V3.02)
CALIPSO HOME → CALIPSO User’s Guide → HOME → IIR Level 2 Swath Product

Introduction

This document provides a description and preliminary quality assessment of the Level 2 IIR swath product DP2.2B, as described in Section 2.9 of the CALIPSO CALIPSO Data Products Catalog (Version 3.5) (PDF).

The IIR swath product DP2.2B contains brightness temperatures over the IIR swath for the three channels (8.65, 10.60 and 12.05 μm) directly derived from the Level 1 radiances, a scene classification, effective emissivity of the selected upper cloud or aerosols layers and ice cloud microphysics.

Don't forget to check out the detailed data quality summary for this data product. (At the end of page).

The main data quality summaries page may be found in this link: https://www-calipso.larc.nasa.gov/products/inventory.php.

Input Data Summary:

  • CALIPSO IIR Level 1B product DP1.2, version V1.10 until 19 Aug 08 and V1.11 afterwards
  • CALIPSO Lidar Level 2, 5-km Cloud and Aerosols layer product DP2.1A, version V3.01.
  • CALIPSO WFC Level 1B product DP1.3, 1-km registered science record, version V3.01.
  • GMAO GEOS 5 Met data: version 5.10 or 5.20 since August 2008, depending on availability.
  • IGBP surface type and NSIDC snow/ice index (1/6° resolution, same as in CALIOP products).

Output Summary:

IIR swath product, version V3.01 and V3.02.



Other documentations and references

IIR Level 2 Algorithm Theoretical Basis Document (ref PC-SCI-204), revised version in preparation.

Related Publications:

  • Chiriaco, M., H. Chepfer, P. Minnis, M. Haeffelin, S. Platnick, D. Baumgardner, P. Dubuisson, M. McGill, V. Noel, J. Pelon, D. Spangenberg, S. Sun-Mack, and G. Wind, 2007: "Comparison of CALIPSO-Like, LaRC, and MODIS Retrievals of Ice-Cloud Properties over SIRTA in France and Florida during CRYSTAL-FACE", J. Appl. Meteor. Climatol., 46, 249-272.
  • Chiriaco, M, H. Chepfer, V. Noel, A. Delaval, M. Haeffelin, P. Dubuisson, and P. Yang, 2004: "Improving Retrievals of Cirrus Cloud Particle Size Coupling Lidar and Three-Channel Radiometric Techniques", Mon. Wea. Rev., 132, 1684-1700.
  • Chomette, O., A. Garnier, J. Pelon, A. Lifermann, T. Bret-Dibat, S. Ackerman, H. Chepfer, P. Dubuisson, V. Giraud, Y. Hu, D. Kratz, V. Noel, C. M. R. Platt, F. Sirou, and C. Stubenrauch, 2003: "Retrieval of cloud emissivity and particle size frame of the CALIPSO mission", IEEE International Geoscience and Remote Sensing Symposium, Toulouse, France.
  • Dubuisson, P., V. Giraud, J. Pelon, B. Cadet, and P. Yang, 2008: "Sensitivity of Thermal Infrared Radiation at the Top of the Atmosphere and the Surface to Ice Cloud Microphysics", J. Appl. Meteor. Climatol., 47, 2545-2560.
  • Dubuisson P., V. Giraud, O. Chomette, H. Chepfer, J. Pelon, 2005: "Fast radiative transfer modeling for infrared imaging radiometry", J. Quant. Spectr. Rad. Tr.,Volume 95, 2, 201-220.
  • Garnier, A. J. Pelon, P. Dubuisson, M. Faivre, O. Chomette, N. Pascal, D. P. Kratz, 2012: &"Retrieval of cloud properties using CALIPSO Imaging Infrared Radiometer. Part I: effective emissivity and optical depth", accepted at J. Appl. Meteor. Climatol..
  • Josset, D., J. Pelon, A. Garnier, Y. Hu, M. Vaughan, P.-W. Zhai, R. Kuehn, and P. Lucker, 2012: "Cirrus optical depth and lidar ratio retrieval from combined CALIPSO-CloudSat observations using ocean surface echo", J. Geophys. Res., 117, D05207, doi:10.1029/2011/D016959.
  • Liu, Z., Liu, D., Huang, J., Vaughan, M., Uno, I., Sugimoto, N., Kittaka, C., Trepte, C., Wang, Z., Hostetler, C., and Winker, D., 2008: "Airborne dust distributions over the Tibetan Plateau and surrounding areas derived from the first year of CALIPSO lidar observations", Atmos. Chem. Phys., 8, 5045-5060.
  • Parol F., J. C. Buriez, G. Brogniez and Y. Fouquart, 1991: "Information content of AVHRR channels 4 and 5 with respect to the effective radius of cirrus cloud particles", J. Appl. Meteor., 30, pp. 973-984.
  • Scott, N., 2009: "Assessing Calipso IIR radiances accuracy via stand-alone validation and a GEO/LEO inter-calibration approach using MODIS/Aqua and SEVIRI/MSG", GSICS Quaterly, vol 3, n°3.
  • Sourdeval, O., G. Brogniez, J. Pelon, L. C.-Labonnote, P. Dubuisson, F. Parol, D. Josset, A. Garnier, M. Faivre, A. Minikin, 2012: "Validation of IIR/Calipso level 1 measurements by comparison with collocated airborne observations during ‘Circle-2’ and ‘Biscay 08’ campaigns", J. Atmos. Oceanic Technol., doi:10.1175/JTECH-D-11-00143.1, (in press).
  • Wilber, A.C., D.P. Kratz, S.K. Gupta, 1999: "Surface Emissivity Maps for Use of Satellite Retrievals of Longwave Radiation", NASA Tech. Pub., TP-99-209362, [Available at Wilber, et al 1999 (PDF)].
  • Yang P., H. Wei., H. L. Huang, B. A. Baum, Y. X. Hu, G. W. Kattawar, M. I. Mishchenko, and Q. Fu, 2005: "Scattering and absorption property database for nonspherical ice particles in the near-through far-infrared spectral region", Appl. Opt., 44, pp. 5512-5523.

Standard and Expedited Data Set Definitions

Standard Data Sets:

Standard data processing begins immediately upon delivery of all required ancillary data sets. The ancillary data sets used in standard processing (e.g., GMAO meteorological data from the National Snow and Ice Data Center) must be spatially and temporally matched to the CALIPSO data acquisition times, and thus the time lag latency between data onboard acquisition and the start of standard processing can be on the order of several days. The data in each data set are global, but are produced in files by half orbit, with the day portion of an orbit in one file and the night portion of the orbit in another.

Expedited Data Sets:

Expedited data are processed as soon as possible after following downlink from the satellite and delivery to Langley Research Center (LaRC). Latency between onboard acquisition and analysis expedited processing is typically on the order or 6 to 28 hours. Expedited processing uses the most recently current available set of ancillary data (e.g., GMAO meteorological profiles) and calibration coefficients available, which may lag the CALIPSO data acquisition time/date by several days.

Expedited data files contain at the most, 90 minutes of data. Therefore, each file may contain both day and night data.

NOTE: Users are strongly cautioned against using Expedited data products as the basis for research findings or journal publications. Standard data sets only should be used for these purposes.

The differences between expedited processing and standard processing are explained in more detail in Adapting CALIPSO Climate Measurements for Near Real Time Analyses and Forecasting (PDF).


Data Descriptions

In the text below we provide brief descriptions of individual data fields reported in the CALIPSO IIR/Lidar Level 2 Track products. Where appropriate, we also provide an assessment of the quality and accuracy of the data in the current release. The data descriptions are as follows:

Additionally all the science data sets (SDSs) are listed in the table to the right, click on the SDS name to go directly to the description.

Science Data Set (SDS) Data Maturity Product
Profile_ID NA All
Latitude NA All
Longitude NA All
LIDAR_Shot_Time NA All
IIR_Image_Time_12_05 NA All
Brightness_Temperature_08_65, Brightness_Temperature_12_05, Brightness_Temperature_10_60 Beta All
LIDAR_DayNight_Flag Beta All
Brightness_Temperature_08_65, Brightness_Temperature_12_05, Brightness_Temperature_10_60 Beta All
Calibrated_WFC_Reflectance Beta All
Surface_Emissivity_08_65, Surface_Emissivity_12_05, Surface_Emissivity_10_60 Beta All
Effective_Emissivity_08_65, Effective_Emissivity_12_05, Effective_Emissivity_10_60 Beta All
Effective_Emissivity_Uncertainty_08_65, Effective_Emissivity_Uncertainty_12_05, Effective_Emissivity_Uncertainty_10_60 Beta All
Emissivity_08_65, Emissivity_12_05, Emissivity_10_60 Beta All
Emissivity_Uncertainty_08_65, Emissivity_Uncertainty_12_05, Emissivity_Uncertainty_10_60 Beta All
Homogeneity_Index_BT_08_65, Homogeneity_Index_BT_12_05, Homogeneity_Index_BT_10_60 Beta All
Homogeneity_Index_Surface_e_08_65, Homogeneity_Index_Surface_e_12_05, Homogeneity_Index_Surface_e_10_60 Beta All
Homogeneity_Index_Reflectance Beta All
Homogeneity_Index_Surface_Temperature Beta All
Homogeneity_Index_Humidity_Profile Beta All
Particle_Shape_Index Beta All
Particle_Shape_Index_Confidence Beta All
Effective_Particle_Size Beta All
Optical_Depth_12_05 Beta All
Optical_Depth_12_05_Uncertainty Beta All
Ice_Water_Path Beta All
Ice_Water_Path_Confidence Beta All
Scene_Flag Beta All
IIR_Data_Quality_Flag Beta All

Science Data Parameters

Latitude
This parameter is a replicate of the parameter “Latitude” in Level 1B IIR product. It gives the geodetic latitude at the center of the pixel.

Longitude
This parameter is a replicate of the parameter “Longitude” in Level 1B IIR product. It gives the geodetic longitude at the center of the pixel.

LIDAR_Shot_Time
This parameter is a replicate of the parameter “Lidar_Shot_Time” in Level 1B IIR product.
Time expressed in International Atomic Time (Temps Atomique International, TAI). Units are in seconds, starting from January 1, 1993.

IIR_Image_Time_12_05
This parameter is a replicate of the parameter “Image_Time_12.05” in Level 1B IIR product.
Time expressed in International Atomic Time (Temps Atomique International, TAI). Units are in seconds, starting from January 1, 1993.

LIDAR_DayNight_Flag
This parameter is a replicate of the parameter "Day_night_flag" from CALIOP Lidar Level 2 5-km Cloud and Aerosols layers product.
Value Interpretation
0 day
1 night

Brightness_Temperature_08_65, Brightness_Temperature_12_05, Brightness_Temperature_10_60
These parameters give the brightness temperatures expressed in Kelvin of IIR channel 1 centered on 8.65 μm, IIR channel 3 centered on 12.05 μm and IIR channel 2 centered on 10.60 μm respectively. It is calculated from the corresponding IIR Level 1 calibrated radiance (Calibrated_Radiances_8.65, Calibrated_Radiances_12.05 and Calibrated_Radiances_10.60), expressed in W.m-2.sr-1.μm-1 assuming spectral blackbody radiances centered respectively on 8.65 μm, 12.05 μm and 10.60 μm.

Calibrated_WFC_Reflectance
This parameter is a replicate of the parameter Reflectance from the WFC-IIR Level 1B product, 1-km registered science record.

Surface_Emissivity_08_65
Surface_Emissivity_12_05
Surface_Emissivity_10_60
These parameters are the surface emissivities respectively for channels centered on 08.65, 12.05 and 10.60 μm.

Only the surface emissivities under the track are accurate for this release. The values outside the track are not representative of the values which would be retrieved from the IGBP/NSIDC geotype map (they are an extension of the ones on the track). This will be modified in a future release.


Effective_Emissivity_08_65, Effective_Emissivity_12_05, Effective_Emissivity_10_60
These parameters give the effective emissivity at 8.65 μm, 12.05 μm and 10.60 μm of the single or upper cloud or aerosols layer(s), defined as the upper level of the scene (see Scene_Flag).

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km in V3 instead of +/- 34 km in V2) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for information about the track effective emissivities.


Effective_Emissivity_Uncertainty_08_65, Effective_Emissivity_Uncertainty_12_05, Effective_Emissivity_Uncertainty_10_60
This parameter gives the uncertainty Δε on the effective emissivity, ε, at 08.65 μm, 12.05 μm and 10.60 μm.

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for information about the track effective emissivity uncertainties.


Emissivity_08_65, Emissivity_12_05, Emissivity_10_60
These parameters correspond to the emissivities, they are not computed for this release.

Emissivity_Uncertainty_08_65, Emissivity_Uncertainty_12_05, Emissivity_Uncertainty_10_60
Not computed for this release.

Homogeneity_Index_BT_08_65
Homogeneity_Index_BT_12_05
Homogeneity_Index_BT_10_60
For each IIR channel, this parameter gives the absolute difference between the pixel brightness temperature (BT) and the brightness temperature of the most similar neighboring track pixel (within +/- 50 km) selected by the algorithm. It varies between 0 (identical temperatures) and 1 corresponding to a maximum acceptable difference of 1K for this release.

Homogeneity_Index_Surface_e_08_65
Homogeneity_Index_Surface_e_12_05
Homogeneity_Index_Surface_e_10_60
Not computed for this release.

Homogeneity_Index_Reflectance
Not computed for this release.

Homogeneity_Index_Surface_Temperature
Not computed for this release.

Homogeneity_Index_Humidity_Profile
Not computed for this release.

Particle_Shape_Index
This parameter is a number corresponding to the crystal microphysical model retrieved from the algorithm.
Value Interpretation
7 Aggregates
8 Plates
9 Solid columns

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for information about the track particle shape index.


Particle_Shape_Index_Confidence
This parameter is the confidence in the particle shape retrieval.
Value Interpretation
1 good
2 medium

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for information about the track particle shape index.


Effective_Particle_Size
This parameter is the effective particle diameter (in μm) retrieved from the algorithm.

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for information about the track effective particle size.


Effective_Particle_Size_Uncertainty
This parameter reflects the confidence in the effective particle size retrieval both in nominal (value < 100) and degraded conditions.
Value Interpretation Shape index provided
< 100. = 0.5 x [Size from (12.05; 8.65) + Size from (12.05; 10.60] (microns) Yes
100. Particle_Size from (12.05; 8.65) only
medium confidence
No
200. Particle_Size from (12.05;10.60) only
medium confidence
No
300. size < Particle_size from (12.05;10.6) and (12.05; 8.65)
low confidence
No
310. size < Particle_Size (12.05;10.60) questionable
very low confidence
No
320. size < Particle_Size (12.05; 8.65) questionable
very low confidence
No
400. size > Particle_Size from (12.05;10.6) and (12.05; 8.65)
low confidence
No
410. size > Particle_Size (12.05;10.60) questionable
very low confidence
No
420. size > Particle_Size (12.05; 8.65) questionable
very low confidence
No

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for more information about the track effective particle size uncertainty.


Optical_Depth_12_05
This parameter is the effective absorption optical depth at 12.05 μm derived from the effective emissivity at 12.05 μm.

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for more information about the track optical depth at 12.05 μm.

>

Optical_Depth_12_05_Uncertainty
This parameter if the Optical_Depth_12_05 uncertainty derived from the effective emissivity uncertainty at 12.05 μm.

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for information about the track IR optical depth uncertainty.


Ice_Water_Path
This parameter is an estimate for the ice water path (in g.m-2) derived from the effective particle size and the optical depth at 12.05 μm.

Pixels outside the track take the value calculated for the most similar neighboring track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

Please refer to “IIR/Lidar track product” for information about track ice water path.


Ice_Water_Path_Confidence
Not computed for this release. Please refer to “IIR/Lidar track product” for information about the track ice water path confidence.

Scene_Flag
The Scene_Flag parameter is a composite of two parameters:
  • Type_of_Scene as defined in IIR/Lidar track product and
  • the geotype index defined according to the IGBP classification.
Digits Interpretation
Tens-Units Type_of_Scene
Thousands-Hundreds IGBP index

Pixels outside the track take the value calculated for the most similar neighbour track pixel (within +/- 50 km) according to the homogeneity indices. If no similar pixel is found, this parameter is set to invalid.

This approach is obviously not accurate for the “geotype” which should not be used for scientific analysis. It does not impact the swath effective emissivities as they are not computed over the swath but extrapolated from the track emissivities.


IIR_Data_Quality_Flag
This parameter is an indicator of the IIR calibrated radiance quality and is extracted from the "Pixel_Quality_Index" parameter of the IIR Level 1b product.

If not zero, corresponding to nominal quality:

  • either one channel has poor quality or is missing, most of the time at the edge of the swath, or
  • the radiances in the 3 channels are not all part of the same image measurement sequences which, for scenes with high broken clouds, could lead to some errors at the edge of the images for geometrical reasons.

Bit Bit value Interpretation
1 0 IIR calibrated radiances in the 3 channels are of nominal quality
1 At least one of the channels has poor quality or is missing
2 0 Channels 08.65 and 10.60 derived from the same sequence of acquisition
1 Channels 08.65 and 10.60 not derived from the same sequence of acquisition
3 0 Channels 08.65 and 12.05 derived from the same sequence of acquisition
1 Channels 08.65 and 12.05 not derived from the same sequence of acquisition
4 0 Channels 10.60 and 12.05 derived from the same sequence of acquisition
1 Channels 10.60 and 12.05 not derived from the same sequence of acquisition
5-8 0 N/A

Metadata Parameters

Product_ID
An 80-byte (max) character string specifying the data product name. For the IIR Level 2 swath products, the value of this string is "CAL_IIR_L2_Swath".

Date_Time_at_Granule_Start
A 27-byte character string that reports the date and time at the start of the file orbit segment (i.e., granule). The format is yyyy-mm-ddThh:mm:ss.ffffffZ.

Date_Time_at_Granule_End
A 27-byte character string that reports the date and time at the end of the file orbit segment (i.e., granule). The format is yyyy-mm-ddThh:mm:ss.ffffffZ.

Date_Time_at_Granule_Production
This is a 27-byte character string that defines the date at granule production. The format is yyyy-mm-ddThh:mm:ss.ffffffZ.

Initial_IIR_Scan_Center_Latitude
This field reports the first subsatellite latitude of the granule.

Initial_IIR_Scan_Center_Longitude
This field reports the first subsatellite longitude of the granule.

Ending_IIR_Scan_Center_Latitude
This field reports the last subsatellite latitude of the granule.

Ending_IIR_Scan_Center_Longitude
This field reports the last subsatellite longitude of the granule.

Orbit_Number_at_Granule_Start
This field reports the orbit number at the granule start time.

Orbit_Number_at_Granule_End
This field reports the orbit number at the granule stop time.

Orbit_Number_Change_Time
This field reports the time at which the orbit number changes in the granule.

Path_Number_at_Granule_Start
This field reports the path number at the start time.

Path_Number_at_Granule_End
This field reports the path number at the granule stop time.

Path_Number_Change_Time
This field reports the time at which the path number changes in the granule.

Number_of_IIR_Records_in_File
This field reports the number of IIR records in the file.

Number_of_Valid_08_65_Pixels
This field reports the number of IIR pixels in the file with valid and good quality radiance in channel 08_65.

Number_of_Valid_12_05_Pixels
This field reports the number of IIR pixels in the file with valid and good quality radiance in channel 12_05.

Number_of_Valid_10_60_Pixels
This field reports the number of IIR pixels in the file with valid and good quality radiance in channel 10_60.

Number_of_Invalid_08_65_Pixels
This field reports the number of IIR pixels in the file with invalid or poor quality radiance in channel 08_65.

Number_of_Invalid_12_05_Pixels
This field reports the number of IIR pixels in the file with invalid or poor quality radiance in channel 12_05.

Number_of_Invalid_10_60_Pixels
This field reports the number of IIR pixels in the file with invalid or poor quality radiance in channel 10_60.

Number_of_Rejected_08_65_Pixels
This field reports the number of IIR pixels in the file in channel 08_65 rejected by the algorithm.

Number_of_Rejected_12_05_Pixels
This field reports the number of IIR pixels in the file in channel 12_05 rejected by the algorithm.

Number_of_Rejected_10_60_Pixels
This field reports the number of IIR pixels in the file in channel 10_60 rejected by the algorithm.

Number_of_Rejected_08_65_Pixels_Loc
This field is set to -9999.

Number_of_Rejected_12_05_Pixels_Loc
This field is set to -9999.

Number_of_Rejected_10_60_Pixels_Loc
This field is set to -9999.

Number_of_Rejected_08_65_Pixels_Rad
This field is set to -9999.

Number_of_Rejected_12_05_Pixels_Rad
This field is set to -9999.

Number_of_Rejected_10_60_Pixels_Rad
This field is set to -9999.

Mean_08_65_Radiance_All
This field reports the mean radiance (in W.m-2.sr-1. μm-1) in the file in channel 08_65.

Mean_12_05_Radiance_All
This field reports the mean radiance (in W.m-2.sr-1. μm-1) in the file in channel 12_05.

Mean_10_60_Radiance_All
This field reports the mean radiance (in W.m-2.sr-1. μm-1) in the file in channel 10_60.

Mean_08_65_Radiance_Selected_Cases
This field is set to -9999.

Mean_12_05_Radiance_Selected_Cases
This field is set to -9999.

Mean_10_60_Radiance_Selected_Cases
This field is set to -9999.

Mean_08_65_Brightness_Temp_All
This field reports the mean brightness temperature (in Kelvin) in the file in channel 08_65.

Mean_12_05_Brightness_Temp_All
This field reports the mean brightness temperature (in Kelvin) in the file in channel 12_05.

Mean_10_60_Brightness_Temp_All
This field reports the mean brightness temperature (in Kelvin) in the file in channel 10_60.

Mean_08_65_Brightness_Temp_Selected_Cases
This field is set to -9999.

Mean_12_05_Brightness_Temp_Selected_Cases
This field is set to -9999.

Mean_10_60_Brightness_Temp_Selected_Cases
This field is set to -9999.

GEOS_Version
This is a 64-byte character that reports the version of the GEOS data product provided by the GMAO.


Data Release Versions

IIR Level 2 Swath
Half orbit (Night and Day) emissivity and cloud particle data related to pixels that have been co-located to the Lidar track
Release Date Version Data Date Range Maturity Level
December 2011 3.02 November 1, 2011 to present Beta
May 2011 3.01 June 13, 2006 to October 31, 2011 Beta

Data Quality Statement for the release of the CALIPSO IIR Level 2 Swath Product Version 3.02, December 2011

The CALIPSO Team is releasing Version 3.02 which represents a transition of the Lidar, IIR, WFC processing and browse code to a new cluster computing system. No algorithm changes were introduced and very minor changes were observed between V 3.01 an dV 3.02 as a result of the compiler and computer architecture differences. Version 3.02 is being released in a forward processing mode beginning November 1, 2011.


Data Quality Statement for the release of the CALIPSO IIR Level 2 Swath Product Version 3.01, May 2011

Version 3.01 includes microphysical parameters which were not available in Version 2: effective particle size and uncertainty, particle shape and confidence, and ice-water path. The optical depth derived from the effective emissivity at 12.05 μm has been added.

Version 3.01 IIR scene classification algorithm has been updated with respect to Version 2 (cf Type of Scene, IIR/Lidar track product). Also, Version 3.01 IIR products use Version 3.01 CALIOP Level 2 products (instead of Version 2 for the previous release). Overall, changes in the IIR scene classification are significant in Version 3.01 compared to Version 2.




NASA
Last Updated: November 22, 2021
Curator: Charles R. Trepte
NASA Official: Charles R. Trepte

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