The Normalized Hotspots Indices (NHI; Marchese et al., 2019) by analysing TOA (Top of the Atmosphere) SWIR (Short Wave Infrared) and NIR (Near Infrared) radiances enable the detection and mapping of high-temperature features.
The NHI system provides automated information on high-temperature volcanic features from Sentinel-2 (S2)/Landsat 8-9 (L8/9) data, under the Google Earth Engine (GEE) platform (Marchese and Genzano, 2023), and Sentinel-3 (S3) SLSTR (Sea and Land Surface Temperature Radiometer) observations, at higher temporal resolution (Falconieri et al., 2025)
The NHI tool enables time-series analysis of high-temperature volcanic features under GEE (since 2013 for L8-OLI), in terms of hot pixel number, total SWIR radiance and area covered by hotspots (Genzano et al., 2020).
The NHI tool OSM allows for the analysis of past eruptions using TM, ETM+ and ASTER SWIR data
The NHI products may be used only for research purposes, see papers in the reference list for a proper citation.
Disclaimer
NHI products provided in this website are for experimental/non-commercial use. No guarantee can be given about their accuracy, availability, quality, continuity, timeliness or direct/indirect consequences arising from their use.