ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Publications Copernicus
Articles | Volume V-1-2022
17 May 2022
 | 17 May 2022


R. Binet, E. Bergsma, and V. Poulain

Keywords: satellite, pushbroom, velocity, time delays, time lag, bathymetry

Abstract. Accurate knowledge on the time-delays between detector bands is paramount for the observation of dynamic features in Sentinel-2 imagery. Sentinel-2 inter-band time delays have been characterised analytically and empirically on Level-1B images with help of the rigorous geometric model. Two major contributors have been identified: optical distortion and satellite altitude inducing across- track and along-track delay variations up to ±2% with respect to ESA handbook fixed value. A harmonic attitude perturbation induces a 0.15% peak to peak temporal modulation on delays. An original method is proposed in order to estimate inter-band delays from L1C orthorectified and tiled products. The method relies on the orbital ephemeris embedded in L1C metadata and a lookup table. The performance assessment exhibits a maximum error of 1% and a rms error of 0.28%.