News

Sentinel-3/SLSTR

11/12/2019 Correction of the SLSTR solar band calibration

Rayference has been working on the verification and correction of the S3A/SLSTR solar bands. This activity has been reported in web story of the Eradiate project entitled "Estimating the accuracy of 1D radiative transfer models over the Libya-4 site". Following this study, the S3A/SLSTR Level 1b TOA BRF corrections recommended by Rayference, displayed in the following table,

Bands S1 S2 S3 S5 S6
S3A/SLSTR NADIR VIEW
Correction 0.95 1.10 1.10
S3A/SLSTR OBLIQUE VIEW
Correction 0.92 0.93 0.93

will be used by the CIRCAS project. These calibration correction factors should multiply the delivered top-of-atmosphere bidirectional reflectance factor (TOA BRF) values. The complete analysis is presented in a dedicated report.

Eradiate Workshop 2019

20/11/2019 Eradiate Workshop 2019 Final Agenda Now Available

The final agenda for the Eradiate Workshop 2019 is now available. You can attend remotely upon request.

Application of CISAR to SEVIRI and PROBA-V

06/02/2019 New publication

A new Rayference publication on the CISAR algorithm has been issued:
Luffarelli, M. and Y. Govaerts. 2019. " Joint Retrieval of Surface Reflectance and Aerosol Properties with Continuous Variation of the State Variables in the Solution Space – Part 2: Application to Geostationary and Polar-Orbiting Satellite Observations." Atmospheric Measurement Techniques 12 (2): 791–809.

Eradiate logo

04/01/2019 Eradiate winter news

The latest Eradiate newsletter is available here : " Eradiate Winter News ."

Simulation of Accurate Top-of-Atmosphere 
Spectral Radiance over Pseudo-Invariant Calibration Sites

12/12/2018 New publication

A new Rayference publication has been issued :
Govaerts, Y.M.; Ruethrich, F.; John, V.O.; Quast " Climate Data Records from Meteosat First Generation Part I: Simulation of Accurate Top-of-Atmosphere Spectral Radiance over Pseudo-Invariant Calibration Sites for the Retrieval of the In-Flight Visible Spectral Response. ." Remote Sens. 2018, 10, 1959

Effect of stratospheric aerosols on Rayleigh calibration

22/02/2018 FIDUCEO blog contribution

Visit Rayference contribution to FIDUCEO blog on "Can we trust Earth as a calibration reference for climate monitoring activity?".

Hourly aerosol properties from SEVIRI

17/03/2017 The CISAR algorithm

Rayference releases the Combined Inversion of Surface and AeRosol (CISAR) algorithm, an advanced mathematical method for the joint retrieval of surface reflectance and aerosol properties from observations acquired by space-based imagers.

Retrieval of aerosol single scattering properties

08/03/2017 New publication

A new Rayference publication on the CISAR algorithm has been issued :
Govaerts, Y. and Luffarelli, M. " Joint retrieval of surface reflectance and aerosol properties with continuous variations of the state variables in the solution space: Part 1: theoretical concept." Atmos. Meas. Tech. Discuss. 1doi:10.5194/amt-2017-29, in review.

MVIRI aerosol over India

23/08/2016 FIDUCEO blog contribution

Visit Rayference contribution to FIDUCEO blog on deriving an aerosol climate data record from Meteosat First Generation observations.

Libya 3D surface BRF

03/02/2015 New publication

In the context of the Rayference contribution to QA4ECV FP7 project, a new publication has been issued :
Govaerts, Yves M. 2015. " Sand Dune Ridge Alignment Effects on Surface BRF over the Libya-4 CEOS Calibration Site." Sensors 15, no. 2: 3453-3470.