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Point Cloud Data	Bulk Download	opentopoID: OTLAS.092021.32611.1
Raster Data	Bulk Download	opentopoID: OTSDEM.092021.32611.1

Collection Overview:

This high-resolution topography dataset of the Southern San Andreas Fault (SSAF) includes a point cloud, digital surface model (DSM), and orthomosaic that span ~40 km strike-length of the fault from Painted Canyon south to Bombay Beach, California, USA. The survey width is ~0.5 - 0.7 km, resulting in over 30 km² area. The point cloud contains 8.2 x 109 points, and the DSM and orthomosaic resolutions are 10 cm and 4 cm, respectively. Field work was completed over 3 ½ days in February, 2020 when 15773 photographs were acquired with small uncrewed aerial system (sUAS). The final dataset was produced using structure-from-motion (SfM) processing of derived aerial photographs with georeferencing primarily from dGNSS onboard the sUAS. Vertical root-mean-square-error (RMSe) of the DSM is 0.040 m based on 155 checkpoints measured with dGNSS and horizontal RMSe is estimated to be 0.023 m based on 28 checkpoints that incorporated markers visible in aerial photographs.

Motivations to produce this open dataset include: the high earthquake hazard posed by the SSAF, the broad scientific interest in the area, the excellent ability to resolve the ground surface with SfM techniques due to the very sparse vegetation, and the complement to the existing B4 lidar data collected in 2005. This work also serves as a test-run for rapid response to a future surface-rupturing event, including the potential for repeat surveys to capture afterslip.

Use of the dataset should be acknowledged with authorship information and the DOI (see citation section below). For additional information, please contact Michael Bunds (michael.bunds@uvu.edu).

Dataset Acknowledgement: N/A - Acknowledgement Guidance

Dataset Citation: Bunds, M.P., Scott, C., Whitney, B., and Lee, V.J.C., 2021, High Resolution Topography of the Southern San Andreas Fault from Painted Canyon to Bombay Beach, USA, distributed by OpenTopography. DOI: https://doi.org/10.5069/G94M92RG. Accessed: 2024-12-21       Copied to Clipboard

Use License: CC BY 4.0

Dataset Keywords: San Andreas fault, tectonic, scarp, SfM, sUAS, topography, point cloud, digital elevation model, orthophoto, differencing, Painted Canyon, Mecca Hills, Durmid Hill, Salt Creek, lidar

Survey Date: 02/15/2020 - 02/18/2020

Publication Date: 09/03/2021

Data Provider and Roles:
Funder

• Southern California Earthquake Center

Collectors

• Utah Valley University
• Arizona State University, School of Earth and Space Exploration

Principal Investigators

• Michael Bunds - Utah Valley University
  ORCID: https://orcid.org/0000-0001-7300-051X
• Chelsea Scott - Arizona State University, School of Earth and Space Exploration
  ORCID: https://orcid.org/0000-0002-3884-4693

Total number of points: 8,427,334,008 pts

Area: 40.13 km²

Point Density: 210.00 pts/m²

Classifications:

Class 0 - Never classified

8,427,334,008

Raster Resolution: 0.10 meter

Orthophoto Resolution: 0.04 meter

Coordinate System:
Horizontal: WGS84 / UTM Zone 11N Meters [EPSG: 32611]
Vertical: ITRF2014 epoch 2020.131

Units: meter

Survey Report: Reports

LAS Validation Data Report: Reports

Tile index in shapefile format: Download

Dataset Extent in GeoJSON format:
Point Cloud: CA21_Bunds.geojson
Raster: CA21_Bunds.geojson

Dataset Spatial Bounds: North: 33.6228858510183°     South: 33.3536656843556°     East: -115.730355925612°     West: -116.040271522876°