Knowledgebase:
Difference between NRT and Standard
Posted by Diane Davies on 22 August 2016 07:23 AM

The FIRMS MODIS Archive Download tool provides NRT data and, as it becomes available, it is replaced with data extracted from the standard MCD14ML fire product produced at the MODIS Fire Science Computing Facility (SCF).

Your two files contain i) MODIS NRT data and ii) e standard MCD14ML to ensure users clearly distinguish between the 2 data sources.

Please see the FAQ: What is the difference between NRT and Standard quality fire data? (https://earthdata.nasa.gov/firms-faq#ed-nrt-standard)

For a list of attribute fields for the MODIS data: https://earthdata.nasa.gov/earth-observation-data/near-real-time/firms/c6-mcd14dl#ed-firms-attributes
Both MCD14ML and MCD14DL are processed using the same MOD14 Fire and Thermal Anomalies Algorithm but the the NRT version (MCD14DL) uses predicted (attitude and ephemeris) geolocation and the standard / science quality version (MCD14ML) uses definitive (attitude and ephemeris) geolocation.
The difference between MODIS geolocation when using predicted vs. definitive attitude and ephemeris is routinely less than 100 meters.   However, there are situations, particularly before and after spacecraft maneuvers and during space weather events, when the difference can increase up to several kilometers. The recommendation from EOSDIS is to reprocess data when the definitive attitude and ephemeris data become available.

More information on each dataset -
MCD14DL: https://earthdata.nasa.gov/earth-observation-data/near-real-time/firms/c6-mcd14dl
MCD14ML: http://modis-fire.umd.edu/pages/ActiveFire.php?target=MCD14ML

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