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Data Source: NASA GIBS (Global Imagery Browse Services)
Instruments: OMPS, MODIS, VIIRS, Suomi NPP | Update: Daily
Free base map: OpenStreetMap. No Google Maps dependency.

Satellite Overlay Controls

NASA GIBS Layers

Controls are separated from volcano markers so the satellite plume/gas layers stay visually distinct from the registry.

Date

Daily tiles

Volcanic Gas / Plumes

OMPS

SO2 Lower TroposphereOMPS NOAA-20 sulfur dioxide. Useful for fresh eruption/outgassing plumes. Aerosol IndexOMPS absorbing aerosol/ash signal. Availability depends on daily swath coverage.

Thermal / Fire Pixels

VIIRS + MODIS

VIIRS Thermal AnomaliesSuomi NPP 375m hot pixels. Can include fires, industry, lava, or hot ground. MODIS Thermal AnomaliesTerra/Aqua thermal detections for broader regional heat context.

Visible Plume Backdrop

MODIS / VIIRS

MODIS True ColorTerra corrected reflectance for ash clouds and visible plume context. VIIRS True ColorSuomi NPP corrected reflectance, daily when daytime imagery is available.

Legend

Map keys

Live NASA EONET volcano event

Frequently active / monitored volcano

Dormant or monitored Holocene volcano

SO2 / aerosol plume overlay

True-color plume backdrop

Source Notes
Volcano list: USGS Volcano Hazards Program worldwide GVP endpoint. Live alerts: NASA EONET. Imagery: NASA GIBS WMTS. Marker status is a GWN display classification, not an official alert level.