ASI: Utilizing PRISMA for Retrieving Chlorophyll Concentration in Inland Waters

ASI: Utilizing PRISMA for Retrieving Chlorophyll Concentration in Inland Waters

Lake Varese, located in the southern Alps, is a shallow lake with a mean depth of 11 m, a maximum depth of 26 m, and a surface area of 14.8 km². The lake is classified as monomictic and eutrophic.

A semi-empirical algorithm utilizing adaptive band ratios of spectral bands in the red/near-infrared region was applied to the PRISMA image taken on October 16, 2021. This algorithm allowed for the creation of a map showing the concentration of chlorophyll in the euphotic layer of Lake Varese’s waters. The excessive growth of cyanobacteria in the lake has led to various issues that require accurate and spatial information for effective management.

The image provided is a cropped section from a larger 30 km x 30 km PRISMA acquisition. It was processed as part of the ASI project “Sviluppo di Prodotti Iperspettrali Prototipali Evoluti” (Development of Evolved Hyperspectral Prototype Products). The main objective of this project is to prototype a subset of L3/L4 value-added products using hyperspectral data processing. One of the prototypes currently being developed is the “Water Quality” product, which aims to analyze parameters such as phytoplankton, total suspended matter, and bottom substrate.

The data and information used in this analysis were generated by e-GEOS, Consiglio Nazionale delle Ricerche-Istituto di Scienze Marine (CNR-ISMAR), and Consiglio Nazionale delle Ricerche-Istituto per il Rilevamento Elettromagnetico dell’Ambiente (CNR-IREA) under an ASI License to Use. The original PRISMA product is copyrighted by ASI (2021).

For the full frame image, you can download it in jpg format from the provided link.