DOI: https://doi.org/10.5069/G9G73BX2
OT Collection ID: OT.102026.6340.1
OT Collection Name: Assessing Geomorphic Effects of Hurricane Hilary, CA 2023
Short Name: CA23_West
Collection Platform: Airborne Lidar

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Download and Access Products: 
	1. Point Cloud Data
		opentopoID: OTLAS.102026.6340.1
		Data Processing: https://portal.opentopography.org/lidarDataset?opentopoID=OTLAS.102026.6340.1

	2. Raster
		opentopoID: OTSDEM.102026.6340.1
		Data Processing: https://portal.opentopography.org/raster?opentopoID=OTSDEM.102026.6340.1


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Collection Overview: In August 2023, Hurricane Hilary brought widespread heavy rainfall to Southern California. Some normally arid desert areas received more than their typical annual rainfall, which triggered debris flows, flash floods, and large-scale sediment movement. Lidar data was collected shortly after the storm to capture evidence of how the landscape changed during this event. This project and its research is being conducted within the structure of the Center for Land Surface Hazards (CLaSH). Its goal is to document erosion, deposition, impacts on infrastructure, and to improve understanding of cascading hazards. The data also support the development and testing of next-generation hazard models.

Dataset Acknowledgement: Data collection was funded by NSF grant awards: 2224871 and 2344994

Dataset Citation: Clark, M., West, A.J. (2026). Assessing Geomorphic Effects of Hurricane Hilary, CA 2023. National Center for Airborne Laser Mapping (NCALM). Distributed by OpenTopography. https://doi.org/10.5069/G9G73BX2. Accessed 2026-10-08

Use License: CC BY 4.0

Dataset Keywords: lidar, geomorphology, erosion, hurricane, california, hazards

Survey Date: 09/26/2023
Publication Date: 10/07/2026

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Data Provider and Roles:
	1. University of Southern California
	Role: Principal Investigator
	Url: Not Available.

	2. University of Michigan
	Role: Principal Investigator
	Url: Not Available.

	3. National Center for Airborne Laser Mapping
	Role: Collector
	Url: https://ncalm.cive.uh.edu/

	4. National Science Foundation
	Role: Funder
	Url: https://nsf.gov/


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Total Number of Points: 707,129,618 pts

Area: 85.5 km^2

Point Density: 8.27 pts/m^2

Classifications: 
	Class 1 - Unclassified: 30,243
	Class 2 - Ground: 261,924,704
	Class 3 - Low Vegetation: 191,574,213
	Class 4 - Medium Vegetation: 91,618,005
	Class 5 - High Vegetation: 54,716,461
	Class 6 - Building: 33,187
	Class 7 - Low Point (low noise): 16,999
	Class 8 - Model Key/Reserved: 107,154,470
	Class 18 - High Noise: 61,336
Coordinates System: 
	Horizontal: NAD83 (2011)  / UTM Zone 11N Meters [EPSG: 6340]
	Vertical: NAVD88 (GEOID 12B) [EPSG: 5703]

Survey Report: 

LAS Validation Data Report: https://portal.opentopography.org/lasReport?opentopoID=OTLAS.102026.6340.1

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Dataset Boundary in GeoJSON Format: 
	Point Cloud: https://raw.githubusercontent.com/OpenTopography/Data_Catalog_Spatial_Boundaries/main/OpenTopography_Point_Cloud_Lidar/CA23_West.geojson
	Raster: https://raw.githubusercontent.com/OpenTopography/Data_Catalog_Spatial_Boundaries/main/OpenTopography_Raster/CA23_West.geojson

Dataset Extent (Bounding Box):
	North: 34.190573°
	South: 34.091158°
	East: -116.701001°
	West: -116.84416°