Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance Validation
Geo-Kompsat-2A (Geostationary-Korean Multi-Purpose SATtellite-2A, GK2A), a new generation of Korean geostationary meteorological satellite, carry state-of-the-art optical sensors with significantly higher radiometric, spectral, and spatial resolution than the Communication, Ocean, and Meteorological...
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doaj-930447741262471eae4695210f6587812021-03-29T23:05:39ZengMDPI AGRemote Sensing2072-42922021-03-01131303130310.3390/rs13071303Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance ValidationDohyeong Kim0Minju Gu1Tae-Hyeong Oh2Eun-Kyu Kim3Hye-Ji Yang4National Meteorological Satellite Center, Korea Meteorological Administration, Jincheon 27803, KoreaNational Meteorological Satellite Center, Korea Meteorological Administration, Jincheon 27803, KoreaNational Meteorological Satellite Center, Korea Meteorological Administration, Jincheon 27803, KoreaNational Meteorological Satellite Center, Korea Meteorological Administration, Jincheon 27803, KoreaNational Air Emission Inventory and Research Center, Ministry of Environment, Cheongju 28166, KoreaGeo-Kompsat-2A (Geostationary-Korean Multi-Purpose SATtellite-2A, GK2A), a new generation of Korean geostationary meteorological satellite, carry state-of-the-art optical sensors with significantly higher radiometric, spectral, and spatial resolution than the Communication, Ocean, and Meteorological Satellite (COMS) previously available in the geostationary orbit. The new Advanced Meteorological Imager (AMI) on GK2A has 16 observation channels, and its spatial resolution is 0.5 or 1 km for visible channels and 2 km for near-infrared and infrared channels. These advantages, when combined with shortened revisit times (around 10 min for full disk and 2 min for sectored regions), provide new levels of capacity for the identification and tracking of rapidly changing weather phenomena and for the derivation of quantitative products. These improvements will bring about unprecedented levels of performance in nowcasting services and short-range weather forecasting systems. Imagery from the satellites is distributed and disseminated to users via multiple paths, including internet services and satellite broadcasting services. In post-launch performance validation, infrared channel calibration is accurate to within 0.2 K with no significant diurnal variation using an approach developed under the Global Space-based Inter-Calibration System framework. Visible and near infrared channels showed unexpected seasonal variations of approximately 5 to 10% using the ray matching method and lunar calibration. Image navigation was accurate to within requirements, 42 µrad (1.5 km), and channel-to-channel registration was also validated. This paper describes the features of the GK2A AMI, GK2A ground segment, and data distribution. Early performance results of AMI during the commissioning period are presented to demonstrate the capabilities and applications of the sensor.https://www.mdpi.com/2072-4292/13/7/1303Geo-Kompsat-2A (GK2A)Advanced Meteorological Imager (AMI)geostationary meteorological satellite |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dohyeong Kim Minju Gu Tae-Hyeong Oh Eun-Kyu Kim Hye-Ji Yang |
spellingShingle |
Dohyeong Kim Minju Gu Tae-Hyeong Oh Eun-Kyu Kim Hye-Ji Yang Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance Validation Remote Sensing Geo-Kompsat-2A (GK2A) Advanced Meteorological Imager (AMI) geostationary meteorological satellite |
author_facet |
Dohyeong Kim Minju Gu Tae-Hyeong Oh Eun-Kyu Kim Hye-Ji Yang |
author_sort |
Dohyeong Kim |
title |
Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance Validation |
title_short |
Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance Validation |
title_full |
Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance Validation |
title_fullStr |
Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance Validation |
title_full_unstemmed |
Introduction of the Advanced Meteorological Imager of Geo-Kompsat-2a: In-Orbit Tests and Performance Validation |
title_sort |
introduction of the advanced meteorological imager of geo-kompsat-2a: in-orbit tests and performance validation |
publisher |
MDPI AG |
series |
Remote Sensing |
issn |
2072-4292 |
publishDate |
2021-03-01 |
description |
Geo-Kompsat-2A (Geostationary-Korean Multi-Purpose SATtellite-2A, GK2A), a new generation of Korean geostationary meteorological satellite, carry state-of-the-art optical sensors with significantly higher radiometric, spectral, and spatial resolution than the Communication, Ocean, and Meteorological Satellite (COMS) previously available in the geostationary orbit. The new Advanced Meteorological Imager (AMI) on GK2A has 16 observation channels, and its spatial resolution is 0.5 or 1 km for visible channels and 2 km for near-infrared and infrared channels. These advantages, when combined with shortened revisit times (around 10 min for full disk and 2 min for sectored regions), provide new levels of capacity for the identification and tracking of rapidly changing weather phenomena and for the derivation of quantitative products. These improvements will bring about unprecedented levels of performance in nowcasting services and short-range weather forecasting systems. Imagery from the satellites is distributed and disseminated to users via multiple paths, including internet services and satellite broadcasting services. In post-launch performance validation, infrared channel calibration is accurate to within 0.2 K with no significant diurnal variation using an approach developed under the Global Space-based Inter-Calibration System framework. Visible and near infrared channels showed unexpected seasonal variations of approximately 5 to 10% using the ray matching method and lunar calibration. Image navigation was accurate to within requirements, 42 µrad (1.5 km), and channel-to-channel registration was also validated. This paper describes the features of the GK2A AMI, GK2A ground segment, and data distribution. Early performance results of AMI during the commissioning period are presented to demonstrate the capabilities and applications of the sensor. |
topic |
Geo-Kompsat-2A (GK2A) Advanced Meteorological Imager (AMI) geostationary meteorological satellite |
url |
https://www.mdpi.com/2072-4292/13/7/1303 |
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