# Wildfire Frequency Occurrence

A **wildfire** is an unplanned, uncontrolled and unpredictable fire in an area of combustible vegetation starting in rural and/or urban areas. Some forest ecosystems in their natural state depend on wildfire. Depending on the type of vegetation present, a wildfire can also be classified more specifically as a bushfire (in Australia), desert fire, grass fire, hill fire, peat fire, prairie fire, vegetation fire, or veld fire. 

The "wildfire frequency occurrence" layer refers to the number of times a wildfire is detected using satellite images. The number is returned as **‰** (per mill): 

$$
f(x) = (x/ X\_{total})\*1000
$$

f(x) is the returned number, x is the number of observed wildfires, Xtotal is the total number of observation for the specific area.

<figure><img src="/files/tCfXlOhDMLijsiXAOmcm" alt=""><figcaption><p>Wildfire frequency occurrence global map</p></figcaption></figure>


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