EARTH SCIENCE>OCEANS
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

EARTH SCIENCE>OCEANS>SEA ICE>SEA ICE CONCENTRATION
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

GOSAT-GW/AMSR3 L3 High-resolution Sea Ice Concentration (1-Month,12.5km,EG)
type: Dataset
access rights: No constraints but users need to be registered with [the G-Portal User Registration system](https://gportal.jaxa.jp/gpr/user/regist1?lang=en) to download files.
description: GOSAT-GW/AMSR3 L3 High-resolution Sea Ice Concentration (EG, 12.5 km, 1-Month) dataset is obtained from the AMSR3 sensor onboard GOSAT-GW and produced by the Japan Aerospace Exploration Agency (JAXA).GOSAT-GW was launched by the H-IIA Launch Vehicle No. 50 (H-IIA 50) at 01:33 a.m. on Jun 29th, 2025 (Japan Standard Time, JST). GOSAT-GW equipped with AMSR3 takes measurements at multiple microwave frequencies and multiple polarizations of weak electromagnetic waves in the microwave band radiated from the Earthâs surface and the atmosphere. AMSR3 has swath of 1535 km and 11 microwave bands. The observation data will enable the creation of long-term trustworthy data sets of global physical amount.Level 3 products are gridded data. They store the brightness tempreture or physical parameters data converted using grid processing and temporally statical processing.This product includes monthly mean High-resolution Sea Ice Concentration (HSI). HSI product stores percentage of sea ice coverage within target ocean area. There is no sea ice within pixel area when sea ice concentration is 0%, and all pixel area is covered by sea ice when it shows 100%. Sea Ice Concentration (SIC) product also detects the ratio of the sea ice area in each pixel with 15 km spatial resolution. By the limitation of the spatial resolution, it is sometimes difficult for SIC product to monitor detail distribution of the sea ice. HSI product detects the ratio of the sea ice area in each pixel with 5 km spatial resolution mainly using the 89GHz vertical and horizontal polarization Brightness Temperature based on the characteristics of the Brightness Temperature and its polarization difference.The provided format is NetCDF4. The current version of the product is Version 01A. The physical quantity unit is [%]. The generation unit is global. The sampling resolution is 12.5 km. The projection method is EG.
language: EN
license: LicenseDocument
  label: The users are entitled to use, reprocess and redistribute G-Portal data including commercial use for free except for the condition about acknowledgement of data credit as stipulated in G-Portal terms of use 7.(2). Click [here](https://gportal.jaxa.jp/gpr/index/eula?lang=en) for detailed G-Portal data usage constrains.
modified: 2025-08-11T00:00:00Z
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subject: oceans
temporal: PeriodOfTime
  start date: 2025-08-11T00:00:00Z
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  creator: https://doi.org/
  notation: https://doi.org/10.57746/EO.01hmtc81ff2ej6x8rhka7h301w
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keyword: OCEANS
keyword: EARTH SCIENCE
keyword: SEA ICE
keyword: SEA ICE CONCENTRATION
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was generated by: Activity
  started at time: 2025-08-11T00:00:00Z
  used: GOSAT-GW

CatalogRecord
conforms to: https://joinup.ec.europa.eu/release/geodcat-ap/20
modified: 2026-06-30T00:00:00Z
source: https://fedeo.ceos.org/collections/series/items/GOSAT-GW_AMSR3_L3_HSI_1Month_12.5km_EG

https://fedeo.ceos.org/collections/series/items/GOSAT-GW_AMSR3_L3_HSI_1Month_12.5km_EG
type: CatalogRecord
conforms to: ISO19139-2

EARTH SCIENCE>CRYOSPHERE
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords

EARTH SCIENCE>CRYOSPHERE>SEA ICE
type: Concept
in scheme: https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords