IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A new hyperspectral radiometer integrated in automated networks of water and land bidirectional reflectance measurements for validation of Sentinel-2ABCD - The H2020/HYPERNETS Project
Autor/es:
KUUSK, J.; DOXARAN, D.; BRANDO, V.; RUDDICK, K.; DOGLIOTTI, A. I.
Reunión:
Encuentro; Sentinel-2 Validation Team Meeting; 2018
Resumen:
Networking of automated instruments on unmanned platforms, e.g. AERONET-OC and RADCALNET, has proved to be the most effective way to provide validation data forCopernicus optical missions. The re-use of data from each site for many optical missions (Sentinel-2A&B, Sentinel3A&B, PROBA-V, MODIS-AQUA/TERRA, VIIRS, Landsat-8,Pléiades, ENMAP, PRISMA, SABIAMAR, etc.) gives a huge economy of scale. The existing AERONET-OC and RADCALNET networks are based on multispectral instruments, which are expensive to acquire and require modelling associated uncertainties to cover all spectral  bands of all sensors. Recent advances in opto-electronics facilitate the use of miniaturized hyperspectral spectrometers, with reduced price. Industrial production of video surveillance cameras greatly reduces the price of pointing systems for scientific instruments. Improved LEDs can provide a stable light source for relative calibration  and continuous autonomous monitoring of radiometers.  Webcams (for remote inspection of instruments  and maintenance support) and data transmission have  become cheaper allowing reducing the running costs and improving the reliability of autonomous instrument systems. The objective of the HYPERNETS project, starting in February 2018, is to develop a new lower cost hyperspectral radiometer and associated pointing system and embedded calibration device for automated measurement of water and land bidirectional reflectance.The instrument will be tested in a prototype network covering a wide range of water and land types and operating conditions. Quality controlled data with associated uncertainty estimates will be provided automatically for the validation of all optical satellite missions. Preparations will be made a) for the new instrument design (and associated calibration service) to be commercialized with an expected lifetime of at least 10 years and b) for the networks to be further expanded tobecome the main source of surface reflectance validationdata for all spectral bands of all optical missions for at least the next 10 years after project completion. This presentation will put forward the project´s current understanding of what radiometer characteristics, auxiliary equipment and network infrastructure is needed by validation scientists and by the European Space Agency and EU/Copernicus for validation of Sentinel-2A, 2B ? 2C and 2D water and land reflectance products. Feedback from the validation community will help refine this understanding of needs and hence guide the project developments.