A fire that is intentionally ignited in an area or under circumstances where and when there should not be a fire.

A method to document a fire scene using right angle measurements off of a base line.

The personnel and equipment collectively assigned to the suppression of a specific fire or group of fires.

A circular holding pattern of an aircraft around a fixed location often related to a wildland fire. For example, the circular pattern of an airtanker in the vicinity of a wildland fire, waiting to make a retardant drop.

A firefighter who determines the location of a fire line.

Device commonly used to collect and permit measurement of any form of rain and snow sufficiently heavy to have fallen to the earth's surface.

Specific portion of the fire on which fire retardant or water is to be dropped by airtankers or helitankers.

Target area for airtankers, helitankers, cargo dropping.

External diameter of a cylinder or tube, conductor, or coupling as distinguished from the internal diameter.

An area over an incident, whether within an FTA or TFR, where aviation operations are taking place.