GCOM-W/AMSR2 L3 Brightness Temperature (36Ghz) (1-Month,0.25 deg)

  • DOI: 10.57746/EO.01gs73b2bpp5znbgfxzs0vsv0e
  • Last Updated: 2023-02-14
Data Progress: In Work
G-Portal

Product Summary

GCOM-W/AMSR2 L3 Brightness Temperature (36Ghz) (1-Month,0.25 deg) dataset is obtained from the AMSR2 sensor onboard GCOM-W and produced by the Japan Aerospace Exploration Agency (JAXA).
GCOM-W was launched by the H-IIA Launch Vehicle No. 21 (H-IIA F21) at 1:39 a.m. on May 18th, 2012 (Japan Standard Time, JST) and inserted into a planned position on the "A-Train" orbit. GCOM-W equipped with AMSR2 takes measurements at multiple microwave frequencies and multiple polarizations of weak electromagnetic waves in the microwave band radiated from the Earth’s surface and the atmosphere. AMSR2 has swath of 1450 km and 7 microwave bands. The observation data will enable the creation of long-term trustworthy data sets of global physical amount.
The Level 3 process uses as its inputs one day's worth of Level 1B data and Level 2 data and calculates, by taking a simple arithmetic mean, the daily statistical mean value at each grid point in the specified mapping projection method (either equi-rectangular or polar stereo). Furthermore, Level 3 processing takes one month's worth of each geophysical parameter's Level 3 daily statistical mean values and calculates the monthly statistical mean value at each grid point using a simple arithmetic mean in the same way as the daily statistical mean calculation. The statistical means are calculated separately for observations along the satellite's ascending and descending tracks.
This product includes averaged Brightness Temperature at 36GHz (Brightness_Temperature_(H), Brightness_Temperature_(H)), Standard Deviation (Standard_Deviation), Average Number (Average_Number) and Total Number (Total_Number).
Brightness Temperature is calculated from sensor counts and is proportional to the power of observed electromagnetic wave. They are expressed by the physical temperature of blackbody, which can emit the electromagnetic wave with the same power, and unit is Kelvin. Horizontal polarized wave and vertical polarized wave are stored separately. Missing value is 65535. When there is no geophysical data within observation swath, this value is set up when computing neither the case where the amount of geophysics is incomputable, nor the amount of geophysics. Error values are 65531 to 65534. It is outside observation swath data.
Standard_Deviation is standard deviation value for each pixel. This item is only stored in monthly product.
Average_Number is the number of valid physical quantity data (except error and missing) which was used to determine "Geophysical Data".
Total_Number is the number of physical quantity data included in the grid (include valid and invalid).
The provided format is HDF5. The Sampling resolution is 0.25degree grid. The statistical period is 1 month. The current version of the product is Version 2. The Version 1 is also available. The projection method is EQR and PS. The generation unit is global.

Platform
GCOM-W
Sensor
AMSR2

Coverage

Temporal Coverage

2012-07-02 to Present

Spatial Coverage

Bounding Rectangle
(90.0°, -180.0°, -90.0°, 180.0°)

Resolution

0.25 deg

Location

  • GEOGRAPHIC REGION > GLOBAL
Dataset Short Name
GCOM-W_AMSR2_L3_T36_1month_0.25deg
Platform / Sensor
GCOM-W / AMSR2
Coverage
Spatial Coverage
Bounding Rectangle
(90.0°, -180.0°, -90.0°, 180.0°)
Temporal Coverage
2012-07-02 to Present
Product Level ID
L3
Version Description

Version 1, 2013-03-01, Available
Version 2, 2016-08-23, Available

File Format
HDF5
Dataset Type
1month / Global
Resolution
Spatial Resolution
0.25 deg
Temporal Resolution
1month
Dataset Progress
In Work
Projection
EQR and PS
Collection Data Type
SCIENCE_QUALITY
Get Data
https://gportal.jaxa.jp/gpr/?lang=en
Dataset Title
GCOM-W/AMSR2 L3 Brightness Temperature (36Ghz) (1-Month,0.25 deg)
Distribution Format
HDF5
Fees
Free
Citation
Japan Aerospace Exploration Agency. 2012. GCOM-W/AMSR2 L3 Brightness Temperature (36Ghz) (1-Month,0.25 deg). https://doi.org/10.57746/EO.01gs73b2bpp5znbgfxzs0vsv0e
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Use Constraints

The user is entitled to use G-Portal data free of charge without any restrictions (including commercial use) except for the condition about acknowledgement of data credit as stipulated in G-portal terms of use 7.(2).Click here for detailed G-Portal data usage constrains.

G-Portal Terms of service
https://gportal.jaxa.jp/gpr/index/eula?lang=en
ISO Topic Categories
  • IMAGERY/BASE MAPS/EARTH COVER
Science Keywords
  • EARTH SCIENCE > SPECTRAL/ENGINEERING > MICROWAVE > BRIGHTNESS TEMPERATURE
Location Keywords
  • GEOGRAPHIC REGION > GLOBAL

ISO Topic Categories is the keywords in the ISO 19115 - Geographic Information Metadata.

Science Keywords hosts Global Change Master Directory (GCMD) Keywords which are a hierarchical set of controlled Earth Science vocabularies that help ensure Earth science data, services, and variables are described in a consistent and comprehensive manner and allow for the precise searching of metadata and subsequent retrieval of data, services, and variables.