A high spatial resolution daily fire perimeter progression dataset for wildfires in the Western United States: 2020-2024

This dataset provides high-resolution wildfire perimeter data interpreted from aerial infrared imagery collected by the U.S. Forest Service’s National Infrared Operations (NIROPS) between June 2020 and November 2024. The dataset includes 12,705 observations across 737 unique fire incidents located within U.S. Forest Service Regions 1 through 6. Infrared perimeters were manually digitized by trained infrared interpreters and reflect active wildfire extents derived from thermal imaging during daily or sub-daily flight operations. Original perimeter files were retrieved from the public FTP server hosted by the U.S. National Interagency Fire Center (NIFC). These data were acquired in various formats (e.g., shapefiles, geodatabases, KMLs), and this dataset standardizes them into a consistent spatial format using EPSG:4326 (WGS 84). Temporal metadata were harmonized to UTC format, and geometries were validated to correct topological issues. Perimeters were selected based on a minimum inclusion criterion of three NIROPS collection days per fire, with at least one consecutive daily pair to capture progression. This resource is especially useful for researchers conducting fire behavior modeling, evaluating fuel treatment effectiveness, or validating satellite-derived fire products. All fire polygons are attributed with the incident name, date/time of collection, and national unit identifiers to enable cross-referencing with other wildfire databases. A Python script is provided to automate retrieval, validation, and visualization, facilitating reproducibility and future dataset updates. The dataset is organized as a single Esri shapefile containing individual fire perimeters with attributes describing the incident, acquisition time, and region. Spatial and temporal quality assurance was implemented via a programmatic validation pipeline and manual inspection. Summary plots and regional fire trends are also used to support exploratory analysis and identify anomalies. Due to NIROPS’s operational deployment criteria, most included fires are of moderate to large size, and data collection often begins after the initial ignition. This dataset is best used to analyze fire progression and response activity rather than as a complete record of total burned area. Original infrared imagery is not publicly available; however, cross-validation with final incident perimeters and metadata helped ensure internal consistency. This curated, high-resolution perimeter dataset offers an important resource for the wildfire science community, land managers, and policymakers seeking to understand fire growth patterns and improve preparedness and response planning.