A Google Earth Engine (GEE) system/tool for the monitoring of active volcanoes at a global scale

The NHI (Normalized Hotspot Indices) system performs the automated monitoring of volcanic thermal anomalies at global scale under the Google Earth Engine (GEE) platform, by integrating information from Sentinel-2 MSI and Landsat 8/9 OLI/OLI-2 data. Thermal anomalies flagged by the NHI system may be then investigated through the tool. The latter enables the analysis of volcanic thermal features in terms of hot spot pixels, total SWIR (short wave infrared) radiance and total hotspot area, with low processing times. In this study, we present some recent results of the active volcanoes investigation performed using the tool, starting from the automated NHI detections. Results show that the NHI system/tool may provide a relevant contribution to the monitoring of thermal volcanic activity in both remote and well-monitored areas, thanks to the capacity in detecting and mapping hot targets with a low false positive rate.