# VIIRS 375 m Active Fire NRT (FIRMS)
*data products*

## Specifications
- **level**: L2
- **distributor**: nasa
- **gsd m**: {"native":375}
- **access endpoint**: https://firms.modaps.eosdis.nasa.gov/active_fire/
- **access model**: open
- **licence**: NASA open data
- **cost model summary**: Free and open via NASA FIRMS; global within 3 hours of satellite acquisition
- **primary data portal url**: https://firms.modaps.eosdis.nasa.gov/
- **deployment context**: orbital
- **entity type**: data_product
- **last verified date**: 2026-05-31
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: nasa
- **attributes**: {"level":"L2","distributor":"nasa","gsd_m":"{\"native\":375}","access_endpoint":"https://firms.modaps.eosdis.nasa.gov/active_fire/","access_model":"open","licence":"NASA open data","cost_model_summary":"Free and open via NASA FIRMS; global within 3 hours of satellite acquisition","primary_data_portal_url":"https://firms.modaps.eosdis.nasa.gov/","deployment_context":"orbital"}

## Editorial
VIIRS 375 m Active Fire NRT (FIRMS) is a Level-2 active fire and thermal anomaly detection product derived from VIIRS I-band channels at 375 m ground sample distance. The algorithm uses all five VIIRS 375 m I-band channels, with the I4 mid-infrared band (3.55-3.93 um) as the primary fire detection channel.[^viirs-af-user-guide]

Two product variants are available: VNP14IMG from the Suomi-NPP VIIRS instrument, with Science Data Records archived from 2012-01-19; and VJ114IMG from the NOAA-20 (JPSS-1) VIIRS instrument. The archive start date for VJ114IMG is reported as approximately 2018 in available product documentation.[^earthdata-viirs-af] Output is provided as 6-minute swath granules.

The product uses the Schroeder et al. 2014 fire detection algorithm. I4 band saturation frequently occurs over large, intense fires; in saturation conditions the algorithm operates in detection-only mode and does not provide sub-pixel fire characterisation.[^viirs-af-user-guide]

Near-real-time delivery is within 3 hours of satellite acquisition via NASA FIRMS. Output formats include TXT, SHP, KML, and WMS; TXT and SHP files contain the full attribute set. Access is free under the NASA EOSDIS open data policy at firms.modaps.eosdis.nasa.gov.[^firms-active-fire]

## Compositional position
- wildfire (topics) --[topic_capabilities]--> VIIRS 375 m Active Fire NRT (FIRMS)

## Sources
- [earthdata-viirs-af] | VNP14IMG VIIRS 375m Active Fire NRT, NASA Earthdata | https://www.earthdata.nasa.gov/learn/find-data/near-real-time/firms/vnp14imgtdlnrt | tier=agency-doc | accessed=2026-05-31
- [viirs-af-user-guide] | VIIRS Active Fire Products User Guide v1.3, LP DAAC | https://lpdaac.usgs.gov/documents/132/VNP14_User_Guide_v1.3.pdf | tier=operator-engineering | accessed=2026-05-31
- [firms-active-fire] | NASA FIRMS active fire products overview | https://firms.modaps.eosdis.nasa.gov/active_fire/ | tier=operator-datasheet | accessed=2026-05-31

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Source: https://eo-atlas.org/data_products/viirs-active-fire-375m
Maintainer: SpectraWorks B.V. (CC-BY 4.0)