Abstract
The Sentinel-2A and Sentinel-2B were respectively launched in June 2015 and March 2017. The SENTINEL mission is dedicated to Earth’s land surfaces in order to monitor vegetation and land cover evolution. The SENTINEL constellation provides images to various spatial resolutions (from 10m to 60 depending on the band) for the 13 spectral bands (from 443 to 2190nm) with a high revisit frequency (5 days for both Sentinel- 2A and 2B). The instruments are in-flight calibrated and characterized primarily using on-board device (diffuser). Vicarious calibration methods are used in addition to validate the on-board calibration. Various natural sites and phenomenon are used such as Rayleigh scattering for absolute calibration in the short wavelengths range, desert for cross-satellite calibration and Deep Convective Clouds (DCC) for cross-band calibration. Based on these methods, it is also possible to provide an accurate checking of many radiometric aspects and on a large range of scenes. The vicarious calibration also allows to check the cross calibration between Sentinel-2A and 2B and also between many other instruments such as MERIS or MODIS. The results of the Sentinel-2A and Sentinel-2B calibration obtained with the on-board device will be briefly presented. Afterwards, we will focus on calibration results from vicarious methods which will be presented and discussed.
Results from the Radiometric Absolute Calibration of Sentinen-2A and Sentinel-2B
The Sentinel-2A and Sentinel-2B were respectively launched in June 2015 and March 2017. The SENTINEL mission is dedicated to Earth’s land surfaces in order to monitor vegetation and land cover evolution. The SENTINEL constellation provides images to various spatial resolutions (from 10m to 60 depending on the band) for the 13 spectral bands (from 443 to 2190nm) with a high revisit frequency (5 days for both Sentinel- 2A and 2B). The instruments are in-flight calibrated and characterized primarily using on-board device (diffuser). Vicarious calibration methods are used in addition to validate the on-board calibration. Various natural sites and phenomenon are used such as Rayleigh scattering for absolute calibration in the short wavelengths range, desert for cross-satellite calibration and Deep Convective Clouds (DCC) for cross-band calibration. Based on these methods, it is also possible to provide an accurate checking of many radiometric aspects and on a large range of scenes. The vicarious calibration also allows to check the cross calibration between Sentinel-2A and 2B and also between many other instruments such as MERIS or MODIS. The results of the Sentinel-2A and Sentinel-2B calibration obtained with the on-board device will be briefly presented. Afterwards, we will focus on calibration results from vicarious methods which will be presented and discussed.