The archived outline of the Long Valley Fire spans about 39.7 km from west to east and 30.1 km from south to north. CAL FIRE places the incident at off Hwy 395 and Cowboy Joe Rd, 3 miles north of Doyle. The mapped boundary provides a second way to locate the event: it shows the extent around that reference location.
| Start listed by CAL FIRE | 11 July 2017 |
|---|---|
| County listing | Lassen |
| Reported area in hectares | 33,886 ha (converted from acres) |
| Extent of the mapped outline | 39.7 × 30.1 km (west–east × south–north) |
| Containment entry in the archive | 9 January 2018 |
| Perimeter collection method as recorded | Infrared Image |
What the perimeter shows
The two spans differ by only 9.6 km. That does not make this a circular burn: the dimensions measure the outermost coordinates, leaving indentations and gaps invisible. Use the polygon itself, rather than its enclosing rectangle, to check whether a location intersects the footprint.
Two estimates of area
The incident report gives 83,733 acres; the interagency feature stores 83,653.1 GIS acres. The mapped value is 79.9 acres below the reported value (0.10%). This compares two published measurements, not two observation times. The difference cannot be read as fire growth.
A similar-sized fire for comparison
The County Fire of 2018 is the closest match by reported acreage in this 100-case collection (90,000 acres). Its mapped spans are 20.6 by 37.6 km, west–east then south–north, versus 39.7 by 30.1 km here. The longer axes run in different directions. Matching on acreage would miss that contrast.
Sources and map method
- Long Valley Fire · CAL FIRE incident record
- NIFC interagency history · source perimeter (GeoJSON)
- County Fire · comparison incident
- Comparison perimeter · interagency record
Spans use the geographic extremes of a generalized boundary, converted to kilometres at its middle latitude. They are approximate map dimensions, not distances travelled by flames. The GIS acreage is the source attribute, not an area recalculated from the simplified outline.