Cloud Properties (CLPR)

Introduction

CLOT_W, CLER_W Define Optical thickness and effective radius of water cloud droplets
Unit none for thickness, mm for radius
ATBD Ver.1 (Sep. 2011)
CLOT_I, CLER_I Define Optical thickness and effective radius of ice cloud droplets
Unit none for thickness, mm for radius
ATBD Ver.1 (Sep. 2011)
CLTT, CLTH Define Temperature and height of cloud top layer.
Unit Kelvin for temperature, km for height
ATBD Ver.1 (Sep. 2011)
CLTYPE Define Cloud discrimination flag including the classification of cloud type and phase (liquid/solid).
Unit none
ATBD Ver.1 (Sep. 2011)

Update contents of Ver2

  • None

Stored Physical quantity

Ver1,2 Description
CLER_I Ice Cloud Effective Radius
CLER_W Liquid Water Cloud Effective Radius
CLOT_I Ice Cloud Optical Thickness
CLOT_W Liquid Water Cloud Optical Thickness
CLTH Cloud Top Height of Both Liquid Water and Ice Clouds
CLTT Cloud Top Temperature of Both Liquid Water and Ice Clouds
CLTYPE Cloud Type under ISCCP Cloud Type Classification Definition
QA_flag

QA_flag information

Ver.1,2 Ver.1,2(Sample Image)

Bit ver1,2 Description CLER_I, W_L3_mask* CLOT_I, W_L3_mask* CLTH, CLTT_L3_mask* CLTYPE_L3_mask*
0 Data Availability 0=Available, 1=Not Available 0 0 0 0
1 Land / Water Flag 0=Water, 1=Land 0 0 0 0
2 Day / Night Flag 0=Day, 1=Night 0 0 0 0
3 Cloud Phase Flag 000=No Measurement
001=No Cloud Flag
010=Clear
011=Undetermined Phase Cloud
100=Liquied Water Cloud
101=Ice Cloud
110=Mixed Phase Cloud
111=TBD
0 0 0 0
4 0 0 0 0
5 0 0 0 0
6 Cloud Optical Thickness Confidence Flag 00=Very Good
01=Good
10=Marginal
11=No Condidence or Fill
0 0 0 0
7 0 1 0 0
8 Cloud Effective Radius Confidence Flag 00=Very Good
01=Good
10=Marginal
11=No Condidence or Fill
0 0 0 0
9 1 0 0 0
10 Cloud Top Temperature Confidence Flag 00=Very Good
01=Good
10=Marginal
11=No Condidence or Fill
0 0 0 0
11 0 0 1 0
12 Subpixel Inhomogeneity Flag 0=No, 1=Yes 0 0 0 0
13 Saturated Radiance Flag 0=No, 1=Yes 0 0 0 0
14 Sunglint Flag 0=No, 1=Yes 0 0 0 0
15 Spare 0=TBD, 1=TBD - - - -

* Bits masked by statistical processing are indicated by 1.

*Download:QA_flag(Ver1,2) Sample Image

Attribute information

Ver1,2 Attribute Remarks
Attribute of Image_data
Attribute of Image_data Grid_interval 0.00833333 1km: 0.00833333
Grid_interval_unit deg
Image_projection EQA (sinusoidal equal area) projection from 0-deg longitude
Lower_left_latitude 40 Variable
Lower_left_longitude 130.541
Lower_right_latitude 40
Lower_right_longitude 143.595
Number_of_lines 1200 1km: 1200
Number_of_pixels 1200
Upper_left_latitude 50 Variable
Upper_left_longitude 155.572
Upper_right_latitude 50
Upper_right_longitude 171.13
CLER_I
CLER_I Data_description Ice Cloud Effective Radius | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 15000 Variable
Minimum_valid_DN 0 Variable
Offset 0 Variable
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.01 Variable
Unit micro meter
Mask_for_statistics 512 Detail:QA_flag information(~L3_mask)
CLER_W
CLER_W Data_description Liquid Water Cloud Effective Radius | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 6200 Variable
Minimum_valid_DN 0 Variable
Offset 0 Variable
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.01 Variable
Unit micro meter
Mask_for_statistics 512 Detail:QA_flag information(~L3_mask)
CLOT_I
CLOT_I Data_description Ice Cloud Optical Thickness | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 15000 Variable
Minimum_valid_DN 0 Variable
Offset 0 Variable
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.01 Variable
Unit Dimensionless
Mask_for_statistics 128 Detail:QA_flag information(~L3_mask)
CLOT_W
CLOT_W Data_description Liquid Water Cloud Optical Thickness | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 10000 Variable
Minimum_valid_DN 0 Variable
Offset 0 Variable
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.01 Variable
Unit Dimensionless
Mask_for_statistics 128 Detail:QA_flag information(~L3_mask)
CLTH
CLTH Data_description Cloud Top Height of Both Liquid Water and Ice Clouds | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 20000 Variable
Minimum_valid_DN 0 Variable
Offset 0 Variable
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.001 Variable
Unit km
Mask_for_statistics 2048 Detail:QA_flag information(~L3_mask)
CLTT
CLTT Data_description Cloud Top Temperature of Both Liquid Water and Ice Clouds | VAL=DN*Slope+Offset
Error_DN 65535
Maximum_valid_DN 20000 Variable
Minimum_valid_DN 0 Variable
Offset 150 Variable
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 0.01 Variable
Unit K
Mask_for_statistics 2048 Detail:QA_flag information(~L3_mask)
CLTYPE
CLTYPE Data_description Cloud Type under ISCCP Cloud Type Classification Definition
0:Clear
1:Cirrus
2:Cirrostratus
3:Deep convection
4:Altocumulus
5:Altostratu
6:Nimbostratus
7:Cumulus
8:Stratocumulus
9:Stratoss
10:Unknown
11:High cloud
12:Middle cloud
13:Low cloud
14:Unknown
255:Error (1-10 for daytime, 11-14 for nighttime)
Error_DN 255
Maximum_valid_DN 14 Variable
Minimum_valid_DN 0 Variable
Offset 0 Variable
Spatial_resolution 0.00833333 1km: 0.00833333
Spatial_resolution_unit degree
Slope 1 Variable
Unit Dimensionless
Mask_for_statistics 0 Detail:QA_flag information(~L3_mask)

How to use

  • ・Physical quantity=DN*slope + offset