This layer presents detectable thermal activity from MODIS satellites for the last 7 days. MODIS Global Fires is a product of NASA’s Earth Observing System Data and Information System (EOSDIS), part of NASA's Earth Science Data.
EOSDIS integrates remote sensing and GIS technologies to deliver global
MODIS hotspot/fire locations to natural resource managers and other
stakeholders around the World.Consumption Best Practices:
As a service that is
subject to Viral loads (very high usage), avoid adding Filters that use a
Date/Time type field. These queries are not cacheable and WILL
be subject to Rate
Limiting by ArcGIS Online. To accommodate filtering events by
Date/Time, we encourage using the included "Age" fields that
maintain the number of Days or Hours since a record was created or last
modified compared to the last service update. These queries fully
support the ability to cache a response, allowing common query results to be
supplied to many users without adding load on the service.When ingesting this service in your applications,
avoid using POST requests, these requests are not cacheable and will also be
subject to Rate Limiting
measures.Source: NASA FIRMS - Active Fire Data - for WorldScale/Resolution: 1kmUpdate Frequency: 1/2 Hour (every 30 minutes) using the Aggregated Live Feed MethodologyArea Covered: WorldWhat can I do with this layer?The
MODIS thermal activity layer can be used to visualize and assess
wildfires worldwide. However, it should be noted that this dataset
contains many “false positives” (e.g., oil/natural gas wells or
volcanoes) since the satellite will detect any large thermal signal.Additional InformationMODIS stands for MODerate resolution Imaging Spectroradiometer. The MODIS instrument is on board NASA’s Earth Observing System (EOS) Terra (EOS AM) and Aqua (EOS PM)
satellites. The orbit of the Terra satellite goes from north to south
across the equator in the morning and Aqua passes south to north over
the equator in the afternoon resulting in global coverage every 1 to 2
days. The EOS satellites have a ±55 degree scanning pattern and orbit at
705 km with a 2,330 km swath width.It takes approximately 2 – 4 hours after satellite overpass for MODIS Rapid Response to process the data, and for the Fire Information for Resource Management System
(FIRMS) to update the website. Occasionally, hardware errors can result in processing delays beyond the 2-4 hour range. Additional
information on the MODIS system status can be found at MODIS Rapid Response.Attribute InformationLatitude and Longitude:
The center point location of the 1km (approx.) pixel flagged as
containing one or more fires/hotspots (fire size is not 1km, but
variable). Stored by Point Geometry. See What does a hotspot/fire detection mean on the ground?Brightness: The brightness temperature measured (in Kelvin) using the MODIS channels 21/22 and channel 31.Scan and Track:
The actual spatial resolution of the scanned pixel. Although the
algorithm works at 1km resolution, the MODIS pixels get bigger toward
the edge of the scan. See What does scan and track mean?Date and Time:
Acquisition date of the hotspot/active fire pixel and time of satellite
overpass in UTC (client presentation in local time). Stored by
Acquisition Date.Acquisition Date: Derived Date/Time field combining Date and Time attributes.Satellite: Whether the detection was picked up by the Terra or Aqua satellite.Confidence: The detection confidence is a quality flag of the individual hotspot/active fire pixel.Version: Version refers to the processing collection and source of data. The number before the decimal refers to the collection (e.g. MODIS Collection 6). The number after the decimal indicates the source of Level 1B data; data processed in near-real time by MODIS Rapid Response
will have the source code “CollectionNumber.0”. Data sourced from
MODAPS (with a 2-month lag) and processed by FIRMS using the standard
MOD14/MYD14 Thermal Anomalies algorithm
will have a source code “CollectionNumber.x”. For example, data with
the version listed as 5.0 is collection 5, processed by MRR, data with
the version listed as 5.1 is collection 5 data processed by FIRMS using
Level 1B data from MODAPS.Bright.T31: Channel 31 brightness temperature (in Kelvins) of the hotspot/active fire pixel.FRP:
Fire Radiative Power. Depicts the pixel-integrated fire radiative power
in MW (MegaWatts). FRP provides information on the measured radiant
heat output of detected fires. The amount of radiant heat energy
liberated per unit time (the Fire Radiative Power) is thought to be
related to the rate at which fuel is being consumed (Wooster et. al.
(2005)).DayNight: The standard processing algorithm uses the solar zenith angle (SZA) to
threshold the day/night value; if the SZA exceeds 85 degrees it is
assigned a night value. SZA values less than 85 degrees are assigned a
day time value. For the NRT algorithm the day/night flag is assigned by
ascending (day) vs descending (night) observation. It is expected that
the NRT assignment of the day/night flag will be amended to be
consistent with the standard processing.Hours Old:
Derived field that provides age of record in hours between Acquisition
date/time and latest update date/time. 0 = less than 1 hour ago, 1 = less than 2 hours ago, 2 = less than 3 hours ago,
and so on.RevisionsJune 22, 2022:
Added 'HOURS_OLD' field to enhance Filtering data.
Added 'Last 7 days' Layer to extend data to match time range of VIIRS offering. Added Field level descriptions.This map is provided for informational purposes and is not monitored 24/7 for accuracy and currency.If you would like to be alerted to potential issues or simply see when this Service will update next, please visit our Live Feed Status Page!