Tecnobosque Wildfire Knowledge Graph · Fire Behaviour
Reference Concept · v1.0Definition → relationship → calculation → evidence context
The mapped boundary enclosing the area affected or burned by a wildfire at a stated time and mapping resolution.
incident perimeter
What is fire perimeter?
The mapped boundary enclosing the area affected or burned by a wildfire at a stated time and mapping resolution.
For Tecnobosque, fire perimeter is useful only when its source, spatial context and observation or modelling window are stated. The same label can otherwise hide important differences between field observations, remote sensing, forecasts and reconstructed incident evidence.
Why it matters
Fire Perimeter is useful because it separates one specific part of wildfire behaviour, exposure, operations or evidence from nearby concepts that can otherwise be mixed together.
The mapped boundary enclosing the area affected or burned by a wildfire at a stated time and mapping resolution.
What changes fire perimeter?
Field observation, remote sensing, model output and retrospective reconstruction can produce values with different assumptions and uncertainty.
A point, parcel, fire-front segment, incident perimeter and regional product can represent very different physical scales.
Wildfire conditions evolve rapidly, so timestamps and averaging periods are part of the meaning of the value.
How to interpret fire perimeter
- Identify exactly what object or process the value describes.
- Check units, spatial scale, timestamp and source before comparing values.
- Separate direct observations from modelled or reconstructed estimates.
- Preserve uncertainty and later revisions instead of overwriting earlier evidence.
What fire perimeter cannot tell you by itself
- Fire Perimeter is not a complete description of wildfire hazard or risk by itself.
- Values from different methods or scales may not be directly comparable.
- A technically precise number can still be misleading when context or uncertainty is omitted.
Fire Perimeter FAQ
Is fire perimeter one fixed value for an entire wildfire?
Usually not. Wildfire conditions vary in space and time, so the value should be attached to a defined place, object and observation period.
Can fire perimeter be used alone for an emergency decision?
No. Operational decisions require current local authority information and a wider set of conditions than a single technical concept can provide.
Fire perimeter: what a mapped outline really says
A fire perimeter is an approximation of the outer boundary used in a particular mapping product at a particular time. It may combine aircraft observations, satellite data, field reconnaissance and mapping interpretation. Different updates can reflect a new survey method rather than actual fire growth alone.
Example: if a mapping product describes 2,500 hectares on Monday and 2,700 hectares on Tuesday, the 200-hectare difference is not, by itself, a valid estimate of spread rate. Establish the observation times, the mapping accuracy and whether the perimeter was revised before calculating an area-change rate.
Perimeter length and burned area are different quantities. A long, narrow fire can have a relatively large boundary for its area. Internal unburned islands may or may not be included, depending on the mapping convention. Do not use a perimeter polygon as an evacuation boundary or a substitute for official incident guidance.
See map resolution versus accuracy and the evidence source library.