{"@type": "dcat:Dataset", "accessLevel": "public", "bureauCode": ["000:00"], "contactPoint": {"@type": "vcard:Contact", "fn": "OpenTopography Support", "hasEmail": "mailto:info@opentopography.org"}, "description": "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.\n\nBare-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.\n\nAccuracy 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).", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5069/G9F47MBX", "mediaType": "text/html", "title": "OpenTopography Data Download Page"}], "identifier": "OTDS.052021.26911.1", "keyword": ["cliff", "community-dataspace", "headwater channel", "hillslope", "landslide", "san gabriel"], "license": "https://creativecommons.org/licenses/by/4.0", "modified": "2021-05-11", "programCode": ["000:000"], "publisher": {"@type": "org:Organization", "name": "OpenTopography"}, "spatial": "-117.57,34.22,-117.57,34.23", "title": "Steep Headwater-Colluvial Channels, Day Creek, San Gabriel Mountains CA, US"}