GC021-03
First evaluation of PRISMA imagery with airborne and field spectroscopy data over different surfaces

Tuesday, 8 December 2020: 04:08
Virtual
Sergio Cogliati1, Biagio Di Mauro2, Roberto Garzonio3, Gabriele Bramati4, Giulia Tagliabue1, Cinzia Panigada1, Micol Rossini1 and Roberto Colombo1, (1)University of Milano - Bicocca, Department of Earth and Environmental Sciences, Milan, Italy, (2)Institute of Polar Sciences - National Research Council of Italy, Milano, Italy, (3)University of Milan - Bicocca, Earth and Environmental Sciences, Milan, Italy, (4)University of Milan - Bicocca, Department of Earth and Environmental Sciences, Milan, Italy
Recorded Presentation
Abstract:
The PRISMA (PRecursore IperSpettrale della Missione Applicativa) satellite mission has been launched by the Italian Space Agency (ASI) on March 22nd 2019. The spaceborne imaging spectrometer features 240 bands covering the visible, near-infrared and shortwave-infrared wavelengths (400-2500 nm) with a spectral resolution < 13 nm. PRISMA acquires hyperspectral images with a spatial resolution of 30 m and a swath of 30 km. Dedicated field campaigns have been conducted during the commissioning phase, to acquire field spectroscopy and airborne imaging spectroscopy data simultaneously with PRISMA acquisitions. The cross-comparison between PRISMA and concurrent field/airborne data offers a means to support satellite mission product evaluation. In particular, our interest is primarily devoted to Top-Of-Atmosphere (TOA) radiance (L1) and surface reflectance (L2D) products. In this contribution, we present a preliminary comparison considering two extremely diverse environments. First, a rural area characterized by several agricultural crops and bare soils has been considered in Tuscany (Grosseto, Italy). The FieldSpec4 and HyPlant imaging spectroscopy data collected over different landcovers within 1 hour from the PRISMA acquisition on June 16th, 2019 are analyzed. Second, field spectral measurements (Spectral Evolution) acquired on snow covered areas in two experimental sites on the European Alps are considered. One experimental site is located in Torgnon (2160 m, Italy); the second one at the Plateau Rosa (3500 m, Switzerland) in the Monte Rosa massif. Two dedicated campaigns have been carried out on February 15th and July 9th at Torgnon and Plateau Rosa sites respectively. The in-situ surface reflectance measurements over different landcovers were propagated to TOA radiance using MODTRAN5 and compared with PRISMA L1 product, whereas L2 product is directly compared with in-situ surface reflectance. Overall, this work offers a first quantitative insight about the PRISMA mission performances and data product consistency. The preliminary results are so far satisfactory and in-line with the expectations and mission requirements, fostering the future development of algorithms for the estimation of bio-geophysical variables from satellite hyperspectral data.
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