Steep Headwater-Colluvial Channels, Day Creek, San Gabriel Mountains CA, US

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Dataset Information

Dataset includes UAV structure-from-motion derived point cloud of steep headwater channels, cliffs, and hillslopes in the headwaters of Day Creek, San Gabriel Mountains, CA (survey conducted in August, 2018). Model spans ~500 x 500 m and was georeferenced to airborne lidar dataset using iterative-closest-point-alignment. Approximate point density of 225 pts/m2. Bare-earth airborne lidar dataset was used as reference cloud (https://doi.org/10.5069/G9J38QPM). No vegetation filtering or clipping was performed on SfM derived point cloud. M3C2 cloud-to-cloud difference with default parameters yields 1-sigma cloud-to-cloud difference of 0.21 m and 2-sigma cloud-to-cloud difference of 0.78 m. Accuracy is likely not sufficient for change detection analysis but is sufficient for morphometric analysis (channel geometries, sediment grain size, spatial patterns of soil/colluvial sediment cover).

opentopoID: OTDS.052021.26911.1
DOI: https://doi.org/10.5069/G9F47MBX
Platform: Structure from Motion / Photogrammetry
Data Format: Point Cloud, Raster
Dataset Acknowledgement: Dataset collection was funded by national science foundation grant to Roman A. DiBiase (EAR-1608014). Authors acknowledge NCALM aerial lidar acquisition "Southern California Bedrock Landscapes 2015 Airborne Lidar" which was used to scale and georeference this dataset. Funds from the Scholten-Williams-Wright Scholarship at Penn State helped support field travel costs.
Dataset Citation: Carr, J.C., Neely, A.B., Del Vecchio, J., Greenberg, E., DiBiase, R.A. (2021). Steep Headwater-Colluvial Channels, Day Creek, San Gabriel Mountains CA, US. Distributed by OpenTopography. https://doi.org/10.5069/G9F47MBX. Accessed: 2025-03-16
Survey Date: 08/15/2018
Survey Area: 0.18 km2
Publication Date: 05/11/2021
Total Number of Points: 30,363,692 pts
Point Density: 168.76 pts/m2
Coordinates System:
Horizontal: NAD83 / UTM zone 11N [EPSG: 26911]
Vertical: NAVD88 [EPSG: 5703]

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3D Point Cloud Viewer


Spatial Extent
Point Cloud Extent Raster Extent

Show Data Files

    Point Cloud
  File Name Size Points Area (m2) Density  
1     Dayck8-15-18_allpts_SFM_cloud_epsg26911.laz     295.28 MB     30,363,692     179,920     168.76         File Metadata    
SpatialReference: 
COMPD_CS["unknown",PROJCS["NAD83 / UTM zone 11N",GEOGCS["NAD83",DATUM["North_American_Datum_1983",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6269"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4269"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-117],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","26911"]],VERT_CS["unknown",VERT_DATUM["unknown",2005],UNIT["metre",1.0,AUTHORITY["EPSG","9001"]],AXIS["Up",UP]]]

Geographic Coordinates (Lat, Lon, Elevation) - EPSG:4326
North-East (Lat, Lon, Elevation): (34.22710495, -117.5687178, 2503.593)
South-West (Lat, Lon, Elevation): (34.2227002, -117.574651, 2192.698)

Projected Coordinates (X, Y) - EPSG:26911
North-East (X, Y): (447617.3, 3787483.63)
South-West (X, Y): (447073.52, 3786998.25)

Classifications:
Class 0 (Created, never classified)30,363,692
    Raster Data
  File Name Size Resolution Dimensions Layer Type  
1     Nadir_Orthophoto_NAD83_z11n_5cm_xy_resolution_Day_ck_2018.tif     241.68 MB     0.05 meter     10967 x 9734                 File Metadata    
SpatialReference 
PROJCS["NAD83 / UTM zone 11N",     GEOGCS["NAD83",         DATUM["North_American_Datum_1983",             SPHEROID["GRS 1980",6378137,298.2572221010042,                 AUTHORITY["EPSG","7019"]],             AUTHORITY["EPSG","6269"]],         PRIMEM["Greenwich",0],         UNIT["degree",0.0174532925199433],         AUTHORITY["EPSG","4269"]],     PROJECTION["Transverse_Mercator"],     PARAMETER["latitude_of_origin",0],     PARAMETER["central_meridian",-117],     PARAMETER["scale_factor",0.9996],     PARAMETER["false_easting",500000],     PARAMETER["false_northing",0],     UNIT["metre",1,         AUTHORITY["EPSG","9001"]],     AUTHORITY["EPSG","26911"]]

Geographic Coordinates (Lat, Lon) - EPSG:4326
North-East (Lat, Lon): (34.22711190967861, -117.56872432225467)
South-West (Lat, Lon): (34.222695028813476, -117.57464798306022)

Projected Coordinates (X, Y) - EPSG:26911
North-East (X, Y): (447619.41, 3787484.39)
South-West (X, Y): (447071.06, 3786997.69)
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