Documentation

Data Product Catalog

This document mainly describes the caltrack product format and content.

Caltrack Data Product Guide v1.6 [en]

User Guide

This document describes the usage of the application, and the output product (its format, which variables it contains...)

Calxtract User Guide v1.6 [en]

Technical Guide

This document focuses more on how the application works. It describes mainly its architecture and how the variables are extracted : the way the coincidences are searched, the algorithms used...

Calxtract Technical Specifications v1.6 [fr]

Variables

Description

Name Description Unit Type
Common to all caltrack unit products
Latitude Latitude °north [-90,90] float32
Longitude Longitude °east [-180,180] float32
Time Time, using the TAI 93 convention seconds float64
CALIOP L1
CAL_LID_L1_Total_Attenuated_Backscatter_532 The Total Attenuated Backscatter signal at 532nm km-1.sr-1 float32[583]
CAL_LID_L1_Perpendicular_Attenuated_Backscatter_532 The perpendicular component of the attenuated backscatter at 532nm km-1.sr-1 float32[583]
CAL_LID_L1_Attenuated_Backscatter_1064 The Attenuated Backscatter signal at 1064nm km-1.sr-1 float32[583]
CAL_LID_L1_Molecular_Number_Density The Molecular Number Density molecules.m^-3 float32[33]
CAL_LID_L1_Temperature The Temperature for each meteo level °C float32[33]
CAL_LID_L1_Pressure The Pressure for each meteo level mb float32[33]
CAL_LID_L1_Ozone_Number_Density The Ozone Number Density molecules.m^-3 float32[33]
CAL_LID_L1_Relative_Humidity The relative humidity for each meteo level % float32[33]
CAL_LID_L1_Land_Water_Mask The Land Water Mask unitless int8
CAL_LID_L1_Tropopause_Height The height of the tropopause Km float32
CAL_LID_L1_Tropopause_Temperature The temperature of the tropopause °C float32
PARASOL L1
P3L1_Input_Index Index [i_row,icol] of the coincident Pixel in the input product. See in the file attribute to know which is this file unitless int16[2]
P3L1_Number_Available_Viewing_Direction Number of available viewing directions Ndir in the following 1<=id<=Ndir unitless uint8
P3L1_Solar_Azimuth_Angle Solar Azimuth Angle ° uint8
P3L1_Pixel_Quality_Index Pixel Data Quality Index for each direction. Also known as DQX unitless uint16
P3L1_Solar_Zenith_Angle Solar Zenith Angle for each direction ° uint16
P3L1_View_Zenith_Angle_670P2 View Zenith Angle for filter 670P2, for each direction ° uint16[16]
P3L1_Relative_Azimuth_Angle_670P2 Relative Azimuth Angle for filter 670P2, for each direction ° uint16[16]
P3L1_Delta_Thetav_Cosphi Relative variation of viewing geometry between the filters, for each direction. See the appendix C of the PARASOL Level-1 Product Data Format and User Manual for details ° int8[16]
P3L1_Delta_Thetav_Sinphi Relative variation of viewing geometry between the filters, for each direction. See the appendix C of the PARASOL Level-1 Product Data Format and User Manual for details ° int8[16]
P3L1_Normalized_Radiance_443NP Normalized Radiance for Channel 443NP, for each direction unitless int16[16]
P3L1_Normalized_Radiance_490P Normalized Radiance for Channel 490P, for each direction unitless int16[16]
P3L1_Normalized_Radiance_1020NP Normalized Radiance for Channel 1020NP, for each direction unitless int16[16]
P3L1_Normalized_Radiance_565NP Normalized Radiance for Channel 565NP, for each direction unitless int16[16]
P3L1_Normalized_Radiance_670P Normalized Radiance for Channel 670P, for each direction unitless int16[16]
P3L1_Normalized_Radiance_763NP Normalized Radiance for Channel 763NP, for each direction unitless int16[16]
P3L1_Normalized_Radiance_765NP Normalized Radiance for Channel 765NP, for each direction unitless int16[16]
P3L1_Normalized_Radiance_865P Normalized Radiance for Channel 865P, for each direction unitless int16[16]
P3L1_Normalized_Radiance_910NP Normalized Radiance for Channel 910NP, for each direction unitless int16[16]
P3L1_Q_Stokes_490P Second component of Stokes vector (Q) for Channel 490P, for each direction unitless int16[16]
P3L1_Q_Stokes_670P Second component of Stokes vector (Q) for Channel 670P, for each direction unitless int16[16]
P3L1_Q_Stokes_865P Second component of Stokes vector (Q) for Channel 865P, for each direction unitless int16[16]
P3L1_U_Stokes_490P Third component of Stokes vector (U) for Channel 490P, for each direction unitless int16[16]
P3L1_U_Stokes_670P Third component of Stokes vector (U) for Channel 670P, for each direction unitless int16[16]
P3L1_U_Stokes_865P Third component of Stokes vector (U) for Channel 865P, for each direction unitless int16[16]
MODIS MYD021KM
MYD021KM_Input_File_Index Index of the input file where the coincidence has been found. See in the file attributes to see the list of files unitless int16[2]
MYD021KM_Input_Pixel_Index Index [i_row,icol] of the coincident Pixel in the input granule unitless int16
MYD021KM_EV_250_Aggr1km_RefSB_Band1 Earth View 250M Aggregated 1km Reflective Solar Bands Scaled Integers of channel n°1 (0.645µm) W/m²/µm/sr uint16
MYD021KM_EV_250_Aggr1km_RefSB_Band2 Earth View 250M Aggregated 1km Reflective Solar Bands Scaled Integers of channel n°2 (0.865µm) W/m²/µm/sr uint16
MYD021KM_EV_500_Aggr1km_RefSB_Band3 Earth View 500M Aggregated 1km Reflective Solar Bands Scaled Integers of channel n°3 (0.469µm) W/m²/µm/sr uint16
MYD021KM_EV_500_Aggr1km_RefSB_Band4 Earth View 500M Aggregated 1km Reflective Solar Bands Scaled Integers of channel n°4 (0.555µm) W/m²/µm/sr uint16
MYD021KM_EV_500_Aggr1km_RefSB_Band5 Earth View 500M Aggregated 1km Reflective Solar Bands Scaled Integers of channel n°5 (1.240µm) W/m²/µm/sr uint16
MYD021KM_EV_500_Aggr1km_RefSB_Band6 Earth View 500M Aggregated 1km Reflective Solar Bands Scaled Integers of channel n°6 (1.640µm) W/m²/µm/sr uint16
MYD021KM_EV_500_Aggr1km_RefSB_Band7 Earth View 500M Aggregated 1km Reflective Solar Bands Scaled Integers of channel n°7 (2.130µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band8 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°8 (0.4125µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band9 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°9 (0.443µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band10 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°10 (0.488µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band11 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°11 (0.541µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band12 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°12 (0.551µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band13LO Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°13LO (0.667µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band13HI Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°13HI (0.667µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band14LO Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°14LO (0.678µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band14HI Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°14HI (0.678µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band15 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°15 (0.748µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band16 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°16 (1.3005µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band17 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°17 (0.905µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band18 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°18 (0.936µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band19 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°19 (0.940µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_RefSB_Band26 Earth View 1KM Reflective Solar Bands Scaled Integers of channel n°26 (1.375µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band20 Earth View 1KM Emissive Bands Scaled Integers of channel n°20 (3.750µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band21 Earth View 1KM Emissive Bands Scaled Integers of channel n°21 (3.959µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band22 Earth View 1KM Emissive Bands Scaled Integers of channel n°22 (3.959µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band23 Earth View 1KM Emissive Bands Scaled Integers of channel n°23 (4.050µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band24 Earth View 1KM Emissive Bands Scaled Integers of channel n°24 (4.465µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band25 Earth View 1KM Emissive Bands Scaled Integers of channel n°25 (4.515µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band27 Earth View 1KM Emissive Bands Scaled Integers of channel n°27 (6.715µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band28 Earth View 1KM Emissive Bands Scaled Integers of channel n°28 (7.325µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band29 Earth View 1KM Emissive Bands Scaled Integers of channel n°29 (8.550µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band30 Earth View 1KM Emissive Bands Scaled Integers of channel n°30 (9.730µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band31 Earth View 1KM Emissive Bands Scaled Integers of channel n°31 (11.030µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band32 Earth View 1KM Emissive Bands Scaled Integers of channel n°32 (12.020µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band33 Earth View 1KM Emissive Bands Scaled Integers of channel n°33 (13.335µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band34 Earth View 1KM Emissive Bands Scaled Integers of channel n°34 (13.635µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band35 Earth View 1KM Emissive Bands Scaled Integers of channel n°35 (13.935µm) W/m²/µm/sr uint16
MYD021KM_EV_1KM_Emissive_Band36 Earth View 1KM Emissive Bands Scaled Integers of channel n°36 (14.235µm) W/m²/µm/sr uint16
CLOUDSAT 1B-CPR
CS_1B_CPR_Input_File_Index Index of the input file where the coincidence has been found. See in the file attributes to see the list of files unitless int16
CS_1B_CPR_Input_Profile_Index Index of the coincident profile unitless int16
CS_1B_CPR_Range_to_intercept Range to the CPR boresight intercept with the geoid Km float32
CS_1B_CPR_Range_to_first_bin Range to first bin is the distance between the satellite and the starting bin number of the ray in meters m float32
CS_1B_CPR_ReceivedEchoPowers Echo Power is the calibrated range gate power in watts, made in-flight and averaged W float32[125]
CALIOP L2 05kmCLay
CAL_LID_L2_05KMCLAY_DEM_Surface_Elevation Surface Elevation read from the Digital Elevation Model (DEM) Km float32
CAL_LID_L2_05KMCLAY_Lidar_Surface_Elevation Lidar Echo Ground Elevation Km float32
CAL_LID_L2_05KMCLAY_Surface_Elevation_Detection_Frequency Lidar Echo Surface Detection Frequency unitless uint8
CAL_LID_L2_05KMCLAY_Number_Layers_Found Number of Cloud Layers Found Layer int8
CAL_LID_L2_05KMCLAY_Layer_Top_Altitude Cloud Layer Top Altitude Km float32[10]
CAL_LID_L2_05KMCLAY_Layer_Base_Altitude Cloud Layer Base Altitude Km float32[10]
CAL_LID_L2_05KMCLAY_Feature_Classification_Flags Cloud Layer feature classification flags unitless uint16[10]
CAL_LID_L2_05KMCLAY_Feature_Optical_Depth_532 Cloud Layer Optical Depth at 532nm unitless float32[10]
CAL_LID_L2_05KMCLAY_Phase Cloud Layer Thermodynamic Phase, as read in the feature classification flags
0=undefined
1=ice
2=water
3=mixed
unitless uint8
CALIOP L2 05kmALay
CAL_LID_L2_05KMALAY_Number_Layers_Found Number of Aerosol Layers Found Layer int8
CAL_LID_L2_05KMALAY_Layer_Top_Altitude Aerosol Layer Top Altitude Km float32[8]
CAL_LID_L2_05KMALAY_Layer_Base_Altitude Aerosol Layer Base Altitude Km float32[8]
CAL_LID_L2_05KMALAY_Feature_Classification_Flags Aerosol layer feature classification flags unitless uint16[8]
CAL_LID_L2_05KMALAY_Layer_Top_Temperature Aerosol Layer Top Temperature °C float32[8]
CAL_LID_L2_05KMALAY_Layer_Base_Temperature Aerosol Layer Base Temperature °C float32[8]
CAL_LID_L2_05KMALAY_Layer_Top_Pressure Aerosol Layer Top Pressure hPa float32[8]
CAL_LID_L2_05KMALAY_Layer_Base_Pressure Aerosol Layer Base Pressure hPa float32[8]
CAL_LID_L2_05KMALAY_Feature_Optical_Depth_532 Aerosol Layer Optical Depth at 532nm unitless float32[8]
CALIPSO IIR L2 Track
CAL_IIR_L2_Brightness_Temperature_12_05 Brightness Temperature at 12µm K float32
CAL_IIR_L2_Brightness_Temperature_10_60 Brightness Temperature at 10,6µm K float32
CAL_IIR_L2_Brightness_Temperature_08_65 Brightness Temperature at 8,65µm K float32
CAL_IIR_L2_Effective_Particle_Size Size of the Particles at 5km Resolution µm float32
CAL_IIR_L2_Particle_Shape_Index Particle Shape Index unitless int8
CAL_IIR_L2_Ice_Water_Path Ice Water Path % float32
PARASOL OC2
P3L2TOGC_Input_Index Index [i_row,icol] of the coincident Pixel in the input product. See in the file attribute to know which is this file unitless int16[2]
P3L2TOGC_Pixel_Confidence_Data Pixel confidence data indicator unitless uint32
P3L2TOGC_Fit_Quality Quality of the fit : IQ = (1 - DLmoy/2E-3) > 0 unitless uint8
P3L2TOGC_Solar_Zenith_Angle Solar Zenith Angle ° uint16
P3L2TOGC_Aerosol_OD_865 Aerosol Optical Thickness at 865nm unitless uint16
P3L2TOGC_Aerosol_OD_670 Aerosol Optical Thickness at 670nm unitless uint16
P3L2TOGC_Aerosol_Angstrom_Coefficient Aerosol Angström Coefficient unitless uint16
P3L2TOGC_Single_Scattering_Albedo_865 Single Scattering Albedo at 865nm unitless uint8
P3L2TOGC_Aerosol_Scattering_Asymmetry_Factor Aerosol Scattering Asymmetry Factor unitless uint8
P3L2TOGC_Aerosol_Index Aerosol Index unitless uint16
P3L2TOGC_Aerosol_Effective_Radius Aerosol Effective Radius µm uint8
P3L2TOGC_Fine_Mode_Effective_Radius Fine Mode Effective Radius µm uint8
P3L2TOGC_Large_Mode_Effective_Radius Large Mode Effective Radius µm uint8
P3L2TOGC_Fine_Mode_OD_865 Fine Mode Optical Thickness at 865nm unitless uint16
P3L2TOGC_Fine_Mode_OD_670 Fine Mode Optical Thickness at 670nm unitless uint16
P3L2TOGC_Fine_Mode_Angstrom_Exponent Fine Mode Angström Exponent unitless uint16
P3L2TOGC_Spherical_Coarse_Mode_OD_865 Optical Thickness of Spherical Coarse Mode at 865nm unitless uint16
P3L2TOGC_Non_Spherical_Coarse_Mode_OD_865 Optical Thickness of Non-Spherical Coarse Mode at 865nm unitless uint16
P3L2TOGC_Relative_Contrib_Non_Spherical_Part_Coarse_Mode Relative Contribution of Non-Spherical Particles in Coarse Mode unitless uint8
P3L2TOGC_Refractive_Index_Fine_Mode Refractive Index of Fine Mode, only for Fine Mode Optical Thickness at 865nm > 0.02 unitless uint8
P3L2TOGC_Refractive_Index_Coarse_Mode Refractive Index of Coarse Mode, only for Spherical Coarse Mode at 865nm > 0.02 unitless uint8
P3L2TOGC_Log_Backscattering_Coefficient_565 Logarithm of the Backscattering Coefficient at 565nm unitless uint16
P3L2TOGC_Log_Backscattering_Coefficient_1020 Logarithm of the Backscattering Coefficient at 1020nm unitless uint16
PARASOL LS2
P3L2TLGC_Input_Index Index [i_row,icol] of the coincident Pixel in the input product. See in the file attribute to know which is this file unitless int16[2]
P3L2TLGC_Land_Water_Indicator Land (100), Water (0) or Mixed (50) Indicator unitless uint8
P3L2TLGC_Pixel_Confidence_Data Pixel confidence data indicator unitless uint32
P3L2TLGC_Aerosol_OD_865 Aerosol Optical Thickness at 865nm unitless uint16
P3L2TLGC_Aerosol_Model_Refractive_Index Aerosol Model Refractive Index (Real Part) unitless uint8
P3L2TLGC_Aerosol_Model_Angstrom_Coefficient Aerosol Model Angström Coefficient unitless uint8
P3L2TLGC_Aerosol_Index Aerosol Index unitless uint16
P3L2TLGC_Fixed_Model_OD_865 Fixed Model Optical Thickness at 865nm unitless uint16
P3L2TLGC_Quality_Index_Viewing_Geometry Quality Index for Viewing Geometry (0:bad ; 1:excellent) unitless uint16
P3L2TLGC_Quality_Index_Polarized_Reflectance_Fit Quality Index for Polarized Reflectance Fit (0:bad ; 1:excellent) unitless uint8
PARASOL RB2
P3L2TRGB_Input_Index Index [i_row,icol] of the coincident Pixel in the input product. See in the file attribute to know which is this file unitless int16[2]
P3L2TRGB_Cloud_Cover cloud cover, defined as the number of cloudy pixels divided by the total number of pixels unitless uint8
P3L2TRGB_Directional_Cloud_Cover Directional Apparent Cloud Cover unitless uint8
P3L2TRGB_Cloud_Oxygen_Pressure mean cloud oxygen pressure (expected to be close of the cloud middle pressure) hPa uint8
P3L2TRGB_Cloud_Oxygen_Pressure_Angular_Stddev Angular Standard Deviation of the Cloud Oxygen Pressure hPa uint8
P3L2TRGB_Cloud_Rayleigh_Pressure mean cloud Rayleigh pressure (expected to be close of the cloud top pressure) hPa uint8
P3L2TRGB_Cloud_Rayleigh_Pressure_Angular_Stddev Angular Standard Deviation of the Cloud Rayleigh Pressure hPa uint8
P3L2TRGB_Cloud_Optical_Thickness linear mean cloud optical thickness (670 nm over land and 865 nm over ocean) unitless uint16
P3L2TRGB_Cloud_Optical_Thickness_Stddev Relative Spatial Standard Deviation of Cloud Optical Thickness % uint8
P3L2TRGB_Cloud_Phase Cloud Phase unitless uint8
P3L2TRGB_Water_Vapor_Column Water Vapor Column, based on clear pixel measurements g/cm² uint8
P3L2TRGB_Mean_Albedo Mean albedo at 670 nm over land and 865 nm over ocean, aka avis unitless uint16
P3L2TRGB_Albedo_Spatial_Stddev Relative spatial standard deviation of the albedos (based on the direction-means), aka rsd_avis % uint8
P3L2TRGB_Albedo_Angular_Stddev Relative angular standard deviation of the albedos (based on the spatial-means), aka rad_avis % uint8
P3L2TRGB_Surface_Type_Index Surface type indicator, aka tmc
[0] : 100% water
[10] : >90% water
[50] : mixed
[90] : >90% Land
[100] : 100% Land
% uint8
P3L2TRGB_Cos_Solar_Zenith_Angle Cosine of the Solar Zenith Angle for central pixel, aka mus unitless uint8
P3L2TRGB_Scene_Albedo_Angular_Stddev Relative Angular standard deviation of the Scene Albedo, aka rad_ascvis % uint8
P3L2TRGB_Optical_Thickness_Homegeneity_Coef Homogeneity coefficient of the optical thickness : Tau*/Tau where Tau is the scene mean optical thickness, and Tau* is the optical thickness derived from the scene mean reflectance, aka eps_tau unitless uint8
MODIS MYD04_L2
MYD04_Input_File_Index Index of the input file where the coincidence has been found. See in the file attributes to see the list of files unitless int16
MYD04_Input_Pixel_Index Index [i_row,icol] of the coincident Pixel in the input granule unitless int16
MYD04_Optical_Depth_Land_And_Ocean Aerosol Optical Thickness at 0.55 micron for both ocean (best) and land (corrected) with best quality data(Quality flag=3) unitless int16
MYD04_Optical_Depth_Ratio_Small_Land_And_Ocean Ratio of small mode optical depth at 0.55 micron unitless int16
MYD04_Effective_Optical_Depth_Best_Ocean Aerosol Optical Thickness at 7 bands for best solution for 0.47, 0.55, 0.66, 0.86, 1.24, 1.63, 2.13 um unitless int16[7]
MYD04_Angstrom_Exponent_1_Ocean Angstrom Exponent for 0.55 and 0.86 micron unitless int16[2]
MODIS MYD05_L2
MYD05_Input_File_Index Index of the input file where the coincidence has been found. See in the file attributes to see the list of files unitless int16[2]
MYD05_Input_Pixel_Index Index [i_row,icol] of the coincident Pixel in the input granule unitless int16
MYD05_Water_Vapor_Near_Infrared Total Column Precipitable Water Vapor - Near Infrared Retrieval cm int16
MYD05_Water_Vapor_Infrared Total Column Precipitable Water Vapor - Infrared Retrieval cm int16
MYD05_Water_Vapor_Correction_Factors Aerosol Correction Factor for Water Vapor - Near Infrared Retrieval unitless int16
MYD05_Quality_Assurance_Infrared Run time QA flags unitless int8[5]
MYD05_Quality_Assurance_Near_Infrared Run time QA flags unitless int8
MYD05_Cloud_Mask MODIS Cloud Mask, First Byte unitless int8
MODIS MYD06_L2
MYD06_Input_File_Index Index of the input file where the coincidence has been found. See in the file attributes to see the list of files unitless int16[2]
MYD06_Input_Pixel_Index Index [i_row,icol] of the coincident Pixel in the input granule unitless int16
MYD06_Brightness_Temperature_Band_29 Brightness Temperature of Channel n°29 (8.550µm) K int16
MYD06_Brightness_Temperature_Band_31 Brightness Temperature of Channel n°31 (11.030µm) K int16
MYD06_Brightness_Temperature_Band_32 Brightness Temperature of Channel n°32. (12.020µm) K int16
MYD06_Brightness_Temperature_Band_33 Brightness Temperature of Channel n°33 (13.335µm) K int16
MYD06_Brightness_Temperature_Band_34 Brightness Temperature of Channel n°34 (13.635µm) K int16
MYD06_Brightness_Temperature_Band_35 Brightness Temperature of Channel n°35 (13.935µm) K int16
MYD06_Brightness_Temperature_Band_36 Brightness Temperature of Channel n°36 (14.235µm) K int16
MYD06_Cloud_Optical_Thickness Cloud Optical Thickness two-channel retrieval using band 7 and either band 1, 2, or 5 unitless int16
MYD06_Cloud_Water_Path Column Water Path two-band retrieval using band 7 and either band 1, 2, or 5 g/m² int16
MYD06_Cloud_Top_Pressure Cloud Top Pressure hPa int16
MYD06_Number_Clear_Pixel Number of Clear Pixels (of 1km) at 5km resolution. Read in the Cloud_Mask_1km dataset nb_pixels int8
MYD06_Number_Cloudy_Pixel Number of Cloudy Pixels (of 1km) at 5km resolution. Read in the Cloud_Mask_1km dataset nb_pixels int8
MYD06_Number_Indetermined_Pixel Number of Indetermined Pixels (of 1km) at 5km resolution. Read in the Cloud_Mask_1km dataset nb_pixels int8
MYD06_Cloud_Effective_Radius Cloud Particle Effective Radius two-channel retrieval using band 7 and either band 1, 2, or 5 (specified in Quality_Assurance_1km) µm int8
MYD06_Cloud_Phase_Optical_Properties Cloud Phase Determination Used in Optical Thickness/Effective Radius Retrieval unitless int16
MYD06_Cloud_Multi_Layer_Flag Cloud Multi Layer Identification From MODIS Shortwave Observations unitless int16
MYD06_Cloud_Fraction Cloud Fraction unitless int8
MYD06_Cloud_Mask_5km MODIS Cloud Mask at 5km, First Byte unitless int8
MYD06_Cloud_Mask_1km MODIS Cloud Mask at 1km, L2 MOD06 QA Plan unitless int8
MYD06_Quality_Assurance_5km Quality Assurance at 5x5 Resolution unitless int8
MYD06_Quality_Assurance_1km Quality Assurance at 1x1 Resolution unitless int8
CLOUDSAT 2B-GEOPROF
CS_2B_GEOPROF_Input_File_Index Index of the input file where the coincidence has been found. See in the file attributes to see the list of files unitless int16
CS_2B_GEOPROF_Input_Profile_Index Index of the coincident profile unitless int16
CS_2B_GEOPROF_Height Height of range bin in Reflectivity/Cloud Mask above reference surface (~ mean sea level) m int16[125]
CS_2B_GEOPROF_CPR_Cloud_mask Each CPR resolution volume is assigned 1 bit mask value:
0 = No cloud detected
1 = likely bad data
5 = likely ground clutter
5-10 = week detection found using along track integration
20 to 40 = Cloud detected .. increasing values represents clouds with lower chance of a being a false detection
unitless int8[125]
CS_2B_GEOPROF_Gaseous_Attenuation Gaseous attenuation dBZe int16[125]
CS_2B_GEOPROF_Radar_Reflectivity Radar reflectivity factor Ze is calculated with the echo power and other input data as described in Li and Durden (2001) dBZe int16[125]
CLOUDSAT 2B-CLDCLASS
CS_2B_CLDCLASS_Input_File_Index Index of the input file where the coincidence has been found. See in the file attributes to see the list of files unitless int16
CS_2B_CLDCLASS_Input_Profile_Index Index of the coincident profile unitless int16
CS_2B_CLDCLASS_Height Height of range bin in Reflectivity/Cloud Mask above reference surface (~ mean sea level) m int16[125]
CS_2B_CLDCLASS_cloud_scenario Algorithm outputs (cloud type and different flags) are combined into a 16 bit cloud_scenario unitless int16[125]
OMI CLDO2
omi_cldo2_cloud_fraction Effective cloud fraction clipped between 0.0 and 1.0 unitless float32
omi_cldo2_cloud_pressure Effective cloud pressure hPa int16
OMI NO2
omi_no2_cloud_fraction Effective cloud fraction unitless int16
omi_no2_cloud_pressure Effective cloud pressure hPa int16
omi_no2_ColumnAmountNO2Trop NO2 tropospheric column density molec/cm^2 float32
omi_no2_ColumnAmountNO2TropStd Precision of the NO2 tropospheric column density molec/cm^2 float32
OMI CLDRR
omi_cldrr_cloud_fraction Cloud Fraction for O3 unitless float32
omi_cldrr_cloud_pressure Cloud Pressure for O3 hPa float32
omi_cldrr_rad_cloud_fraction Radiative Cloud Fraction unitless float32

Calibration

Some of the variables are calibrated to an integer format for saving disk space. For every Caltrack variables, you will find 2 standard SDS attributes called "scale_factor" and "add_offset". Most of time, the standard HDF formula for scaling file values to physical ones is used :

science_value = ( file_value - add_offset ) * scale_factor

PARASOL products :

There is an exception for those files. In this case, you must use :

science_value = data_file_value * scale_factor + add_offset

CLOUDSAT products :

People who are used to CLOUDSAT data should be adviced that the scaling factor set in caltrack files is the inverse of the one that can found in CLOUDSAT files (but the data are the same). The reason is that the scaling equation is different : for CLOUDSAT original data, you must divide by the scale factor instead of multiplying to obtain the science value.

MODIS MYD021KM products :

For those files, 2 calibrations are set for the reflective bands : one for the radiances (set as HDF default), and one for the reflectances. The reflectances scaling is stored in 2 specific SDS attributes : "reflectance_scale" and "reflectance_offset"

Fill Values

The values used to represents absent or dummy ones (also called Fill Values) are based on the type of the variable.

The general rule can be resumed as :

  • Signed Types : the fill value is the minimal possible value
  • Unsigned Types : the fill value is the maximal possible value
Type Fill Value
float32 -inf
float64 -inf
int8 -128
uint8 255
int16 -32768
uint16 65535
int32 -2147483648
uint32 4294967295