Level-2 Tile Statistics

Introduction

L2 Tile Statistics Define Temporal statistics of SGLI Level-2 (L2) Tile geophysical variable (GV) products for land and cryosphere.
Unit Same as the L2 variables
ATBD Ver.1 (Mar. 2017)

Update contents of Ver2

  • Bug fix

Stored Physical quantity

Ver1,2 Description
xxxx_AVE Average of parameter
xxxx_Date Dates of SGLI observation during 8-day or 1month
xxxx_MAX Maximum of parameter
xxxx_MIN Minimum of parameter
xxxx_Ninput The number of input data
xxxx_Nused The number of data used in the statistics
xxxx_QA_flag
xxxx_RMS Root Mean Square of parameter
xxxx: Product ID (Detail:How to use)

QA_flag information

Bit ver1,2 Description
0 water or land 00: water 11: land
1
2
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4
5
6
7
8
9
10
11
12
13
14
15

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
Number_of_lines 4800 250m: 4800
1km: 1200
Number_of_pixels 4800
Lower_left_latitude 30 Variable
Lower_left_longitude 127.017
Lower_right_latitude 30
Lower_right_longitude 138.564
Upper_left_latitude 40
Upper_left_longitude 143.595
Upper_right_latitude 40
Upper_right_longitude 156.649
AVE
AVE
16-bit unsigned integer
Error_DN 65535
Data_description Average of parameter
Maximum_valid_DN 20000 Variable accoring to physical quantity
Minimum_valid_DN 0
Offset -1
Slope 0.0001
Unit NA
Date
Date
8-bit unsigned integer
Data_description Dates of SGLI observation during 8-day 8-day or 1-month
Error_DN 255
Maximum_valid_DN 254 Variable
Minimum_valid_DN 0
Offset 0
Slope 1
Unit day in a 8-day or period in a month 8-day or 1-month
MAX
MAX
16-bit unsigned integer
Data_description Maximum of parameter
Error_DN 65535
Maximum_valid_DN 20000 Variable accoring to physical quantity
Minimum_valid_DN 0
Offset -1
Slope 0.0001
Unit NA
MIN
MIN
16-bit unsigned integer
Data_description Minimum of parameter
Error_DN 65535
Maximum_valid_DN 20000 Variable accoring to physical quantity
Minimum_valid_DN 0
Offset -1
Slope 0.0001
Unit NA
Ninput
Ninput
16-bit unsigned integer
Data_description The number of input data
Error_DN 65535
Maximum_valid_DN 65534 Variable
Minimum_valid_DN 0
Offset 0
Slope 1
Unit NA
Nused
Nused
16-bit unsigned integer
Data_description The number of data used in the statistics
Error_DN 65535
Maximum_valid_DN 65534 Variable
Minimum_valid_DN 0
Offset 0
Slope 1
Unit NA
RMS
RMS
16-bit unsigned integer
Data_description Root Mean Square of parameter
Error_DN 65535
Maximum_valid_DN 20000 Variable accoring to physical quantity
Minimum_valid_DN 0
Offset -1
Slope 0.0001
Unit NA

How to use

  • ・Physical quantity=DN*slope + offset
  • ・Valid values are during Minimum_valid_DN~Maximum_valid_DN
  • ・Product list
Area Physical quantity Product Spacial resolution
K: 1km
Q: 250m
Terrestrial Top-of-atmosphere (TOA) radiance LTOA Q
Normalized Difference Vegetation Index NDVI Q
Enhanced Vegetation Index EVI_ Q
Shadow Index SDI_ Q
Leaf Area Index LAI_ Q
Fraction of Absorbed Photosynthetically Active Radiation FPAR Q
Above Ground Biomass AGB_ Q
Vegetation Roughness Index VRI_ Q
Land Surface Temperature LST_ Q
Cryosphere Snow and Ice Covered area SICE K
Snow and Ice Surface Temperature SIST K
Snow Grain Size of shallow Layer SGSL K
  • *Region:Tile、Temporal resolution:8-day and 1-month