雲フラグ（CLFG）

[DOI: 10.57746/EO.01gs73b3a5wggdxqa0f3wc93zr]
[DOI: 10.57746/EO.01gs73b3b6qd5rbv9jmsgdfdwc]

概要

CLFG 定義 雲タイプ及び雲相(水滴・氷晶)の分類を含む雲識別フラグ
単位 無次元
ATBD Ver.1 (Jul. 2019)
Ver.3 (Oct. 2021)

Ver.2での変更点

  • 無し

Ver.3での変更点

  • ・機械学習を用いた雲、雪氷、エアロゾルフラグ精度の改善
  • ・Error_DN, Maximum_valid_DN, Minimum_valid_DNの変更

サンプル画像

ファイル形式 Ver.1 Ver.2 Ver.3
hdf5 To be uploaded
 CLFGQ(250m)
 CLFGQ(250m)
CLFGF(1/24deg)
JPEG To be uploaded
 Cloud_flag(250m)
 Cloud_flag(250m)
Cloud_flag(1/24deg)

格納物理量

Ver.1,2,3
Cloud_flag

QA_flag情報

  • 無し

Attribute情報

Ver.1,2 Ver.3

Ver.1,2 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 詳細: 雲フラグ情報
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
Ver.3 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 詳細: 雲フラグ情報
Error_DN 0
Maximum_valid_DN 65535 Variable
Minimum_valid_DN 1 Variable
Offset 0 Variable
Spatial_resolution 0.00208333 250m: 0.00208333
1km: 0.00833333
Spatial_resolution_unit degree
Slope 1 Variable
Unit Dimensionless

使い方

  • ・有効値はMinimum_valid_DN～Maximum_valid_DN
  • ・Cloud_flagのBit情報
Bit Ver.1,2,3 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