Users should note:
VIIRS AF product is generated by an automated algorithm and is placed on the web page as soon as available. It has not been quality controlled. For a quality controlled product, users are referred to the Hazard Mapping System (HMS) product created by SAB satellite analysts:
http://www.ospo.noaa.gov/Products/land/hms.html

Fire pixels represent the approximate location of a fire and do not represent the actual fire size. The VIIRS instantaneous field of view at nadir is 0.75 km, but the fire phenomena may be much smaller than that.

If no fires are detected for a given pass, a file is not placed on the server.

Each pass represents 86 seconds of the satellite orbit.