LOS ANGELES COUNTY, CALIFORNIA
Fire activity,
through time.
A quarter century of satellite hotspot detections. Explore when activity was reported, where it appeared, and how each month compares with its history.
One county.
Three satellite records.
A longer perspective.
Loading The County Record
Reading locally bundled observations and county geometry.
SELECTED MONTH
December 2025
THE LONG VIEW
The Fire Calendar
FewerMoreUnavailable
A CLOSER LOOK
Within The Month
Weeks start Monday, UTC. Only dates inside the selected month contribute to each bin.
OBSERVED, BEFORE ADJUSTMENT
Three Sensor Records
Annual qualifying counts within the selected date range; endpoint years may be partial.
Sensor sensitivities and overpass times differ. Raw totals are not interchangeable.
TAKE THE DATA WITH YOU
Explore Beyond The Calendar
CSV downloads follow the current date range and calendar series.
TRANSPARENCY & CONTEXTMethods, Validation & Sources
What The Calendar Measures
Qualifying satellite hotspot detections inside the full Los Angeles County boundary, including offshore components. These records measure reported detections, not wildfire incidents, burned area, severity, or risk.
Type 0 records qualify at MODIS confidence ≥ 30 or Suomi-NPP nominal/high confidence. Exact repeated location/date/time/satellite keys are removed; separate overpasses remain separate detections.
Reading Missing And Zero Values
Unavailable source periods remain missing. Zero means no qualifying detections were reported. Neither zero nor the presence of records establishes complete observing coverage or the absence of fire.
The Reference And Source Switch
Held-Out Evaluation
Quality Accounting
Processing Versions And Limitations
Data Sources
REFERENCE FIGURESDownload The Historical View
Full-record reference figures: Arial, white background, 600 dpi PNG and vector SVG. Calendar: 7.16 × 5.37 inches. Trends: 7.16 × 3.58 inches.
- 2001–2025 calendar: PNG · SVG
- January 2025 weekly totals: PNG · SVG
- Raw annual sensor comparison: PNG · SVG
The main calendar changes from Terra observations to scaled Suomi-NPP in 2013. Weekly bins include only January dates. Raw annual Aqua 2002 and Suomi-NPP 2012 totals cover partial first years; sensor sensitivities differ.