This data release contains two point clouds derived from structure-from-motion photogrammetry. The first survey was conducted on 10 September 2015 and the second survey was conducted on 1 June 2016. Each survey was designed to capture a 35-meter channel reach using digital photos (1187 photos were taken in the first survey and 1085 photos were taken in the second survey). Twenty-five bolts were drilled into the bedrock channel to serve as ground control points. We used a local coordinate system to create a reference frame, but the location of all of the ground control points are attached in the file called: GCPs_exported.txt. Agisoft photoscan was used to construct point clouds from the digital photos, and then sub-sampled the point clouds to a 1 cm spacing. The two subsampled point clouds are provided here in a las format. The .las files are open-source point cloud files and can be opened by any open-source point cloud viewer. Finally, the latitude/longitude of the center of the study area is: 38.733318, -106.187409.
This data was used in the paper: Rengers, F., Kean, J., Reitman, N., Smith, J., Coe, J., McGuire, L. 2020. The Influence of Frost Weathering on Debris Flow Sediment Supply in an Alpine Basin. Journal of Geophysical Research: Earth Surface. 10.1029/2019JF005369
|Title||Chalk Cliffs Channel Surveys derived from Structure-from-Motion|
|Authors||Francis K Rengers|
|Product Type||Data Release|
|Record Source||USGS Digital Object Identifier Catalog|
|USGS Organization||Landslide Hazards Program|