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Flagging is used in surveying to mark grade levels, utility lines, survey stakes and other boundary markers. Surveyors frequently attach their flagging to wooden stakes or lathes, with writing on it. One side tends to have a long number which they reference in a log book. The other side tends to have abbreviations suggesting what the stake marks. Choice of color depends on many factors, and can include availability, and personal preference, or may adhere to some sort of color code. No color codes appear to be mandatory or universal, but certain colors do tend to be used for specific purposes.
In forestry flagging is commonly used to mark trees for various purposes. It can be used to mark trees for logging, to mark dangerous or unhealthy trees, to mark invasive species, or to mark saplings. State and National forests often use a wide variety of flagging tape, sometimes even getting specially printed tape when the full range of color codes is used up.
Wildland fire suppression
Flagging is widely used in wildland fire suppression both as a navigational aid for firefighters and to mark trees. When walking to a wildfire a crew may use flagging to flag their way to the fire, both to aid other firefighters in quickly finding the site and so they can find their way back out easily. Specially marked flagging also exists for fire use, imprinted with terms such as "spot fire" or "escape route".
- Black - deceased
- Red - seriously injured, in need of immediate medical attention to save life
- Yellow - seriously injured but not immediately life-threatening, medical attention can be delayed
- Green - non-serious injuries or "walking wounded"