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Fire Information for Resource Management System (FIRMS)

California fires 2nd August 2021

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NASA's Fire Information for Resource Management System (FIRMS) distributes Near Real-Time (NRT) fire/thermal anomaly data within 3 hours of satellite observation from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) aboard the Terra and Aqua satellites and NASA's Visible Infrared Imaging Radiometer Suite (VIIRS) aboard the joint NASA/NOAA Suomi National Polar orbiting Partnership (Suomi NPP) and NOAA-20 satellites. FIRMS is part of NASA's Land, Atmosphere Near real-time Capability for EOS (LANCE).

Please note: MODIS and VIIRS active fire/thermal anomaly data may be from fire, hot smoke, agriculture or other sources.

MODIS Active Fire Products

MODIS Active Fire Products

Each MODIS active fire/thermal anomaly location represents the center of a 1km pixel that is flagged by the algorithm as containing one or more fires within the pixel. Combined (Terra and Aqua) MODIS NRT active fire products (MCD14DL) are processed using the standard MOD14/MYD14 Fire and Thermal Anomalies algorithm


MODIS Collection 61
has been available since April 2021. C61 processing does not contain any change to the science algorithm; the update is from changes and enhancements to the calibration approach used in the generation of the Terra and Aqua MODIS Level 1B products. For further details on C61 calibration changes and other changes user is encouraged to refer to the Collection 6.1 specific changes that have been summarized here: https://landweb.modaps.eosdis.nasa.gov/QA_WWW/forPage/MODIS_C61_Land_Proposed_ Changes.pdf. For the most up to date information, please refer to the MODIS Collection 6 Active Fire Product User's Guide Revision B

VIIRS (375m) Active Fire Products

VIIRS (375m) Active Fire Products

Each VIIRS active fire/thermal anomaly location represents the center of a 375m pixel. The VIIRS data complement the MODIS fire detections but the improved spatial resolution of the 375 m data provides a greater response of fires over relatively small areas and has improved nighttime performance. Read more on VIIRS Active Fire products.

VIIRS NRT 375 m active fire products are from: Suomi NPP (VNP14IMGTDL_NRT) and NOAA-20, formally known as JPSS-1, (VJ114IMGTDL_NRT).

Please note, in an effort to standardize VIIRS file names from Suomi NPP, the short name for VIIRS NRT 375 m product was changed from VNP14IMGT to VNP14IMGTDL_NRT (18 April 2016).

FIRMS News

FIRMS News

20 April 2021: FIRMS migrated from MODIS Collection 6 to Collection C61. Temporal coverage of C61 extends from 01 November 2020 to present.

1 February 2021: FIRMS US/Canada is now available, see Earthdata article NASA, Forest Service Partnership Expands Active Fire Mapping Capabilities and US Forest Service article Forest Service, NASA upgrade online active fire mapping tool

17 July 2020: Spurious VIIRS/NOAA-20 day time fire detections have been identified on 14 July 2020 with the Mineral Fire in California. These false fires are often picked up due to a combination of super heated smoke plumes and a high view angle. They are more likely to be picked up at night, but have been also identified in day time VIIRS detections from NOAA-20 and Suomi NPP. This is similar to the issue reported on 3 August 2018. Read more...

7 April 2020: VIIRS 375m active fire data from the NOAA-20 (JPSS-1) satellite are available as part of the FIRMS fire email alerts.

15 January 2020: VIIRS 375m active fire data from the NOAA-20 (JPSS-1) satellite has been added to FIRMS. It is available in the FIRMS map and the active fire data downloads. It is not part of the FIRMS fire email alerts but will be added in the near future.

3 August 2018: During the recent California fires some spurious VIIRS night time fire detections have been picked up due to super heated smoke plumes combined with a high view angle. Read an explanation for these events. Such incidents are rare but we suggest you exercise caution when displaying the VIIRS night time fires.


Basic and Advanced Modes for FIRMS UsersFIRMS Blog: basic and advanced mode


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Page Last Updated: Sep 21, 2021 at 7:56 AM EDT