Cloud flag/Classification (CLFG)

Introduction

CLFG Define Cloud discrimination flag including the classification of cloud type and phase (liquid/solid).
Unit none
ATBD Ver.1 (Jul. 2019)

Update contents of Ver2

  • None

Stored Physical quantity

Ver1,2
Cloud_flag

QA_flag information

  • None

Attribute information

Ver1,2 Attribute Remarks
Attribute of Image_data
Attribute of Image_data Grid_interval 0.00208333 250m: 0.00208333
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 4800 250m: 4800
1km: 1200
Number_of_pixels 4800
Upper_left_latitude 50 Variable
Upper_left_longitude 155.572
Upper_right_latitude 50
Upper_right_longitude 171.13
Cloud_flag
Cloud_flag Data_description Cloud flag Detail: Cloud_flag information
Error_DN 65535
Maximum_valid_DN 65533 Variable
Minimum_valid_DN 0 Variable
Offset 0 Variable
Spatial_resolution 0.00208333 250m: 0.00208333
1km: 0.00833333
Spatial_resolution_unit degree
Slope 1 Variable
Unit Dimensionless

How to use

  • ・Valid values are during Minimum_valid_DN~Maximum_valid_DN
  • ・Cloud_flag information
Bit Ver1,2 Description
0 Algorithm Execution 0 = Not executed, 1 = Executed
1 Clear Confidence Level 000 = 0.00 (Cloudy)
001 = 0.00 - 0.17
010 = 0.17 - 0.33
011 = 0.33 - 0.50
100 = 0.50 - 0.67
101 = 0.67 - 0.83
110 = 0.83 - 1.00
111 = 1.00 (Clear)
2
3
4 Day/Night 0 = Night , 1 = Day
5 Land/Water 0 = Water , 1 = Land
6 Snow/Ice 0 = Yes , 1 = No
7 Sun Glint Cone Angle 00 = 0 - 15 [deg.]
01 = 15 - 25
10 = 25 - 35
11 = 35
8
9 Heavy Aerosol 0 = Yes , 1 = No
10 Cirrus Probabilty 0 = Yes , 1 = No
11 Cloud Inhomogeneity 0 = Yes , 1 = No
12 Phase 00 = Uncertain
01 = Water
10 = Ice
11 = Mixed
13
14 Cloud Shadow 0 = Yes , 1 = No
15 VN Data Availability 0 = Not available, 1 = Available