This dataset contains repeat high-resolution UAV LiDAR topographic surveys of 20 debris basins along the front of the San Gabriel Mountains in Los Angeles County, California. The surveys were designed to quantify post-Eaton Fire sediment mobilization associated with major post-fire storm events. UAV LiDAR data were acquired on October 31, November 13, November 26, and December 5, 2025, and January 7–8, February 13, and February 27, 2026. These repeat surveys bracket three major post-fire storm events occurring in November 2025, December 2025, and February 2026. Data were collected using a DJI Matrice 350 RTK UAV equipped with a DJI Zenmuse L2 LiDAR sensor, with an Emlid Reach RS3 GNSS receiver used as the local base station. Flights were conducted at 100–120 m above ground level using terrain following, with 80% front overlap, 20% lateral overlap, simultaneous RGB imagery collection, and an average flight speed of approximately 6 m/s. The surveys produced point densities of approximately 500–700 points/m² and native-resolution products of approximately 3.5 cm. Point clouds were reconstructed in DJI Terra using post-processed kinematic (PPK) positioning and 1-second GNSS base-station observations. Survey products include colorized point clouds, digital elevation models (DEMs), digital surface models (DSMs), and RGB orthomosaics clipped to individual debris-basin boundaries. The repeat datasets support multi-temporal topographic change analysis.

opentopoID: OTDS.092026.6340.1

DOI: https://doi.org/10.5069/G9M043MB

Platform: Airborne Lidar

Data Format: Point Cloud, Raster

Dataset Acknowledgement: Data collection and processing were conducted by the Division of Geological and Planetary Sciences, California Institute of Technology. Los Angeles County Public Works facilitated debris-basin access.

Dataset Citation: Haireti, A., Chen, Z., Geyman, E., and Lamb, M. P. (2026). UAV LiDAR Surveys for Quantifying Post-Eaton Fire Sediment Mobilization, CA. Distributed by OpenTopography. https://doi.org/10.5069/G9M043MB. Accessed 2026-10-22

Survey Date: 10/31/2025 - 02/27/2026

Survey Area: 15.64 km²

Publication Date: 09/15/2026

Point Density: 600 pts/m²

Coordinates System: