Okhotsk sea-ice distriction（OKID）

Introduction

OKID Define The extent of sea ice in Okhotsk Sea.
Unit none
ATBD Ver.1 (Mar. 2016)
Ver.2 (May. 2020)

Update contents of Ver2

  • ・Improved algorithm of cloud identification

Stored Physical quantity

Ver1,2 Description
Line_tai93 TAI93 at each line
OKID

QA_flag information

  • None

Attribute information

Ver1,2 Attribute Remarks
Attribute of Image_data
Attribute of Image_data Number_of_lines 1955 Variable
Number_of_pixels 1250
Grid_interval 1000 250m or 1000m
Grid_interval_unit meter
Image_projection L1B reference grid
Lower_left_latitude 59.1973 Variable
Lower_left_longitude 165.564
Lower_right_latitude 55.2182
Lower_right_longitude -168.536
Upper_left_latitude 76.0432
Upper_left_longitude 170.881
Upper_right_latitude 68.885
Upper_right_longitude -145.343
Line_tai93
Line_tai93
64-bit floating-point		 Data_description TAI93 at each line
Error_value -1
Maximum_valid_value 999999999
Minimum_valid_value 0
Unit second
OKID
OKID
16-bit unsigned integer		 Data_description Detail：OKID_Bit information
Error_DN 65535
Mask_for_statistics 0 Detail：OKID_Bit information（OKID_L3_mask）

How to use

  • ・Valid values are during Minimum_valid_DN～Maximum_valid_DN
  • ・OKID_Bit information
Bit Ver1,2 Description OKID_L3_mask*
0 C1 algorithm process 0
1 cloudy/clear flag 0
2 0
3 0
4 day/night flag 0
5 land/water flag 0
6 snow/ice flag 0
7 0
8 0
9 cloud shadow flag 0
10 radiance saturation 0
11 sun-glint 0
12 missing channel (VN,SW,IR) 0
13 0
14 0
15 error 0
  • * Bits masked by statistical processing are indicated by 1.