Hyperspectral automated validation land site in Argentina (HYPERNETS site): Analysis of first data

PIEGARI, E.; SABERIOON, M.; DOGLIOTTI, A. I.; PERNA. P; RUBINSTEIN, L.; CORDON, G.; GRINGS, F.

Bruselas

Conferencia; HYPERNETS Science Conference; 2023

In order to validate satellite-derived products, in particular surface reflectance, using in situdata is essential to ensure the quality of derived parameters. Therefore, the availability ofrobust and well characterized field validation sites is critical. In the context of HYPERNETS project, a new relatively low cost hyperspectral radiometer (and associated pointing system and embedded calibration device for automated measurement of water and land bidirectional reflectance) has been developed. The new hyperspectral instrument HYPSTAR® XR (eXtended Range) for land autonomously measures surface reflectance with a spectral resolution of 5 nm FWHM in the 400-1700 nm wavelength range at user-defined angles and frequency. The first HYPERNETS land system has been deployed in a temporal test site in a University campus in Buenos Aires city, Argentina. The vegetation in this site is characterized by natural pastures with different treatments distributed in 16 patches of 7 m x 7 m. Even if the site is not ideal for satellite match-up analysis, in the present study we evaluate the quality of the data and characterize the spatial variability (homogeneity) and temporal variability of HYPSTAR® data.The result of a comparison with an ASD radiometer measurements is shown and first matchups results from different high spatial resolution satellite systems (L8/OLI, S2/MSI and PlanetScope/SuperDove) data extracted during the first 5 months of collected data (June-October 2022) are presented and analyzed to show the potential of HYPSTAR® data to validate satellite-derived products.