Digital surface models (DSMs) for 10 islands in the Oregon Coast National Wildlife Refuge Complex, OR, USA
This portion of the data release presents digital surface models (DSMs) for 10 islands in the OCNWRC. The DSM has a resolution of 50 centimeters per pixel and was derived from structure-from-motion (SfM) processing of aerial imagery collected from a helicopter with a hand-held digital camera on 2024-08-15. Unlike a digital elevation model (DEM), the DSM represents the elevation of the highest object within the bounds of a cell. Vegetation and other objects have not been removed from the data. In addition, data artifacts resulting from noise in the original imagery have not been removed. The raw imagery used to create the DSM was acquired using a Canon EOS 5Dsr digital SLR camera (50.6MP Full-Frame CMOS Sensor) with attached Canon GPS Receiver GP-E2 and Canon EF 135mm f/2L USM prime telephoto lens. Images were collected at approximately 230 meters above sea level (ASL), 275-460 meters away while circling each island at least once to provide a set of overlapping oblique images resulting in a nominal ground-sample-distance (GSD) of 1.5 centimeters. The raw imagery was geotagged using positions from the Canon GPS. For 6 islands (Goat Island, Hunters Island, North Crook Point Rock, Saddle Rock, Whaleshead Cove East, Whaleshead Cove West) 3 temporary ground control points (GCPs) were distributed throughout each island to establish survey control. The GCPs consisted of orange 5-gallon bucket lids (diameter 31.4 centimeters). The GCP positions were measured with an Eos GNSS GPS receiver using real time kinematic (RTK) corrections paired with the Field Maps app. The remaining 4 islands (Myers Creek East, Myers Creek West, Unnamed Island 106 and Unnamed Island 73) that did not have GCPs, used existing LiDAR data with the Agisoft Metashape align laser scans feature to better align their positions. The DSM images have been formatted as cloud optimized GeoTIFFs with internal overviews and masks to facilitate cloud-based queries and display.
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Complete Metadata
| accessLevel | public |
|---|---|
| bureauCode |
[ "010:12" ] |
| contactPoint |
{ "fn": "U.S. Geological Survey, Western Ecological Research Center", "@type": "vcard:Contact", "hasEmail": "mailto:gs-b-werc_data_management@usgs.gov" } |
| description | This portion of the data release presents digital surface models (DSMs) for 10 islands in the OCNWRC. The DSM has a resolution of 50 centimeters per pixel and was derived from structure-from-motion (SfM) processing of aerial imagery collected from a helicopter with a hand-held digital camera on 2024-08-15. Unlike a digital elevation model (DEM), the DSM represents the elevation of the highest object within the bounds of a cell. Vegetation and other objects have not been removed from the data. In addition, data artifacts resulting from noise in the original imagery have not been removed. The raw imagery used to create the DSM was acquired using a Canon EOS 5Dsr digital SLR camera (50.6MP Full-Frame CMOS Sensor) with attached Canon GPS Receiver GP-E2 and Canon EF 135mm f/2L USM prime telephoto lens. Images were collected at approximately 230 meters above sea level (ASL), 275-460 meters away while circling each island at least once to provide a set of overlapping oblique images resulting in a nominal ground-sample-distance (GSD) of 1.5 centimeters. The raw imagery was geotagged using positions from the Canon GPS. For 6 islands (Goat Island, Hunters Island, North Crook Point Rock, Saddle Rock, Whaleshead Cove East, Whaleshead Cove West) 3 temporary ground control points (GCPs) were distributed throughout each island to establish survey control. The GCPs consisted of orange 5-gallon bucket lids (diameter 31.4 centimeters). The GCP positions were measured with an Eos GNSS GPS receiver using real time kinematic (RTK) corrections paired with the Field Maps app. The remaining 4 islands (Myers Creek East, Myers Creek West, Unnamed Island 106 and Unnamed Island 73) that did not have GCPs, used existing LiDAR data with the Agisoft Metashape align laser scans feature to better align their positions. The DSM images have been formatted as cloud optimized GeoTIFFs with internal overviews and masks to facilitate cloud-based queries and display. |
| distribution |
[ { "@type": "dcat:Distribution", "title": "Digital Data", "format": "XML", "accessURL": "https://doi.org/10.5066/P14F6BIP", "mediaType": "application/http", "description": "Landing page for access to the data" }, { "@type": "dcat:Distribution", "title": "Original Metadata", "format": "XML", "mediaType": "text/xml", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.68b718bed4be022efaf1ccc4.xml" } ] |
| identifier | http://datainventory.doi.gov/id/dataset/USGS_68b718bed4be022efaf1ccc4 |
| keyword |
[ "Oregon", "Oregon Coast National Wildlife Refuge Complex", "USGS:68b718bed4be022efaf1ccc4", "aerial photography", "biota", "birds", "community ecology", "digital surface models", "elevation", "geomorphology", "geospatial datasets", "habitats", "image collections", "image mosaics", "imageryBaseMapsEarthCover", "island ecosystems", "long-term ecological monitoring", "orthophotography", "remote sensing", "structure from motion", "topography" ] |
| modified | 2026-05-12T00:00:00Z |
| publisher |
{ "name": "U.S. Geological Survey", "@type": "org:Organization" } |
| spatial | -124.4280, 42.0634, -124.3199, 42.3161 |
| theme |
[ "geospatial" ] |
| title | Digital surface models (DSMs) for 10 islands in the Oregon Coast National Wildlife Refuge Complex, OR, USA |
