{"action":"create","ckan_id":null,"date_created":"Sat, 14 Mar 2026 21:20:35 GMT","date_finished":null,"harvest_job_id":"be129330-b656-44ec-b4d7-f277bf7d7116","harvest_source_id":"31f41541-38a0-400b-b240-10ebcb0acd9a","id":"4b295371-853e-4b31-a8f1-3fefe5e94db5","identifier":"https://dggs.alaska.gov/webpubs/metadata/RDF2022-8.xml","parent_identifier":null,"source_hash":"2b0d682b2c24a11350a0aebfcbcc6b501440eca4583bc7e01190251b1ca41120","source_raw":"\r\n\r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tBuzard, R.M.\r\n\t\t\t\tHoren, K.C.\r\n\t\t\t\tMiller, K.Y.\r\n\t\t\t\t2022\r\n\t\t\t\tPhotogrammetry-derived orthoimagery and elevation data for Golovin, Alaska, collected August 28, 2019\r\n\t\t\t\tDSM, Orthoimage\r\n\t\t\t\t\r\n\t\t\t\t\tRaw Data File\r\n\t\t\t\t\tRDF 2022-8\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tFairbanks, Alaska, United States\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\t5 p.\r\n\t\t\t\thttps://doi.org/10.14509/30857\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\tThe Alaska Division of Geological & Geophysical Surveys (DGGS) collected low-altitude aerial images from an unmanned aerial vehicle (UAV) on August 28, 2019, and used Structure-from-Motion (SfM) photogrammetry to produce a digital surface model (DSM) and orthoimagery of Golovin. The orthoimage and elevation data were collected to assess coastal hazards and changes. We used Trimble Business Center to process the Global Navigation Satellite System (GNSS) data used for positional control. We used Agisoft Metashape to process photogrammetry data. These products are released as a Raw Data File with an open end-user license. These products are released as a Raw Data File with an open end-user license. All files can be downloaded from the Alaska Division of Geological & Geophysical Surveys website (http://doi.org/10.14509/30857).\r\n\t\t\tThe orthoimage and elevation data were collected to assess coastal hazards and changes. This data release is a product of the Alaska Coastal Geohazards Program, which provides geohazards evaluation and geologic mapping to support local and regional planning for coastal villages. Ongoing investigations and baseline mapping efforts expand understanding of how Alaska's coastlines evolve evolved and how they respond to future short-term and long-term changes.\r\n\t\t\t>digital surface model: The DSM represents surface elevations such as the height of vegetation and buildings. We filtered the dense cloud to remove low confidence points with less than five contributing combined depth maps. Since water bodies can introduce noise, we manually delineated the river, pond, and beach boundaries to restrict the DSM to land only. Boundaries were identified using both visual selection from collected aerial images and point confidence. The DSM is a single-band, 32-bit floating point GeoTIFF file with a GSD of 0.054 m; the \"No Data\" value is set to -3.4028231 x 10^38.\t\r\n>orthoimagery: The orthoimage is a three-band (red, green, blue), 8-bit unsigned GeoTIFF file with a GSD of 0.027 m per pixel; the \"No Data\" value is set to 0.\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\t20190828\r\n\t\t\t\t\r\n\t\t\t\r\n\t\t\tground condition\r\n\t\t\r\n\t\t\r\n\t\t\tcomplete\r\n\t\t\tNone planned\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\t-163.045827\r\n\t\t\t\t-163.008420\r\n\t\t\t\t64.549101\r\n\t\t\t\t64.539841\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tISO 19115 Topic Category\r\n\t\t\t\tgeoscientificInformation\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\tAerial\r\n\t\t\t\tAerial Geology\r\n\t\t\t\tAerial Photography\r\n\t\t\t\tCoastal\r\n\t\t\t\tCoastal Erosion\r\n\t\t\t\tCoastal and River\r\n\t\t\t\tDGGS\r\n\t\t\t\tDigital Surface Model (DSM)\r\n\t\t\t\tElevation\r\n\t\t\t\tEmergency Preparedness\r\n\t\t\t\tEngineering\r\n\t\t\t\tEngineering Geology\r\n\t\t\t\tEnvironmental\r\n\t\t\t\tErosion\r\n\t\t\t\tFlood\r\n\t\t\t\tFloodplain\r\n\t\t\t\tGeologic\r\n\t\t\t\tGeologic Hazards\r\n\t\t\t\tGeological Process\r\n\t\t\t\tGeology\r\n\t\t\t\tGeomorphology\r\n\t\t\t\tGeotechnical\r\n\t\t\t\tHazards\r\n\t\t\t\tOrthoimagery\r\n\t\t\t\tPhotogrammetry\r\n\t\t\t\tRaster Image\r\n\t\t\t\tRemote Sensing\r\n\t\t\t\tSea Level Changes\r\n\t\t\t\tShelf\r\n\t\t\t\tShoreface\r\n\t\t\t\tStorm Surge\r\n\t\t\t\tStructure From Motion\r\n\t\t\t\tSurface\r\n\t\t\t\tSurficial\r\n\t\t\t\tSurficial Geology\r\n\t\t\t\tTides\r\n\t\t\t\tTopography\r\n\t\t\t\tUnconsolidated Deposits\r\n\t\t\t\tWater\r\n\t\t\t\tWeb Service\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\tGolovin\r\n\t\t\t\tGolovnin Sound\r\n\t\t\t\tSeward Peninsula\r\n\t\t\t\r\n\t\t\r\n\t\tThis report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).\r\n\t\tAny hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.\r\n\t\t\r\n\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\tMetadata Manager\r\n\t\t\t\t\r\n\t\t\t\t\tmailing and physical\r\n\t\t\t\t\t
3354 College Road
\r\n\t\t\t\t\tFairbanks\r\n\t\t\t\t\tAK\r\n\t\t\t\t\t99709-3707\r\n\t\t\t\t\tUSA\r\n\t\t\t\t\r\n\t\t\t\t(907)451-5020\r\n\t\t\t\t(907)451-5050\r\n\t\t\t\tdggspubs@alaska.gov\r\n\t\t\t\t8 am to 4:30 pm, Monday through Friday, except State holidays\r\n\t\t\t\tPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.\r\n\t\t\t\r\n\t\t\r\n\t\tWe thank the Chinik Eskimo Community for supporting the creation of these data products.\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tBuzard, R.M.\r\n\t\t\t\tOverbeck, J.R.\r\n\t\t\t\t2021\r\n\t\t\t\tCoastal flood impact assessments for Alaska communities: Golovin\r\n\t\t\t\t\r\n\t\t\t\t\tReport of Investigation\r\n\t\t\t\t\tRI 2021-1E\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tFairbanks, Alaska, United States\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\t32 p\r\n\t\t\t\thttps://doi.org/10.14509/30855\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tBuzard, R.M.\r\n\t\t\t\tOverbeck, J.R.\r\n\t\t\t\tMaio, C.V.\r\n\t\t\t\t2019\r\n\t\t\t\tCommunity-based methods for monitoring coastal erosion\r\n\t\t\t\t\r\n\t\t\t\t\tInformation Circular\r\n\t\t\t\t\tIC 84\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tFairbanks, Alaska, United States\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\t35 p\r\n\t\t\t\thttps://doi.org/10.14509/30182\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tDeRaps, M.R.\r\n\t\t\t\tKinsman, N.E.M.\r\n\t\t\t\t2012\r\n\t\t\t\tSpatially referenced oblique aerial photography of the Golovin shoreline, July 2012\r\n\t\t\t\t\r\n\t\t\t\t\tRaw Data File\r\n\t\t\t\t\tRDF 2012-4\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tFairbanks, Alaska, United States\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\t2 p\r\n\t\t\t\thttps://doi.org/10.14509/24465\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tKinsman, N.E.M.\r\n\t\t\t\t2015\r\n\t\t\t\tSingle-beam bathymetry data collected in shallow-water areas near Gambell, Golovin, Hooper Bay, Savoonga, Shishmaref, and Wales, Alaska, 2012-2013\r\n\t\t\t\t\r\n\t\t\t\t\tRaw Data File\r\n\t\t\t\t\tRDF 2015-2\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tFairbanks, Alaska, United States\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\t15 p\r\n\t\t\t\thttps://doi.org/10.14509/29348\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tSoutherland, L.E.\r\n\t\t\t\tKinsman, N.E.M.\r\n\t\t\t\t2014\r\n\t\t\t\tLidar data for the community of Golovin, Alaska\r\n\t\t\t\t\r\n\t\t\t\t\tRaw Data File\r\n\t\t\t\t\tRDF 2014-20\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tFairbanks, Alaska, United States\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\t23 p\r\n\t\t\t\thttps://doi.org/10.14509/29127\r\n\t\t\t\r\n\t\t\r\n\t\r\n\t\r\n\t\t\r\n\t\t\tNot applicable\r\n\t\t\r\n\t\tDGGS visually inspected the orthoimage for data errors such as shifts, seamline mismatches, and water noise overlapping land. There were no significantly erroneous areas that required repair. Visual errors common to these SfM photogrammetry products include discontinuous powerlines, blurriness near high-angle features such as buildings, and distortion at water boundaries. Bright objects, such as metal roofs and white paint, can cause overexposure and lead to spurious elevation points.\r\n\t\tThis data release is complete.\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tWe quantify the horizontal accuracy of the DSM and orthoimage by comparing the known locations of 18 photo-identifiable check points measured with GNSS against their modeled locations in the photogrammetric products. These are independent checkpoints not used in processing. X and Y errors are calculated as the root-mean-square (RMS) error of offsets. The total horizontal error is the root-sum-square error of X and Y RMS errors, 0.032 m. See the accompanying report for check points and additional detail.\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tWe assess the vertical accuracy of the DSM using the same check points used to determine horizontal accuracy. The RMS error of Z offsets is 0.035 m. The total error of the DSM (X, Y, and Z) is 0.045 m. See the accompanying report for check points and additional detail.\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tAerial photogrammetric survey - DGGS used a DJI Phantom 4 RTK UAV with a FC6310R camera model (8.8 mm lens) to collect 20-megapixel JPEG photographs (5472 x 3648 pixels per image). We flew the aerial survey with 70 percent sidelap and 80 percent frontlap, 115 m above the ground at between 5.5 and 7.9 m/s, with nadir orientation stabilized using a 3-axis gimbal. This resulted in 1,605 images covering 1.02 km2 with ground sampling distance (GSD) of 0.03 m. DGGS conducted flights on August 28, 2019, from 09:00 AM to 11:30 AM AKDT. The operator returned the UAV five times to change batteries. The weather throughout the survey was overcast with light wind. There was light rain during approximately the first hour of the survey. No abnormalities were observed during the flights.\r\n\t\t\t\t20190828\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tGround survey - DGGS set up a GNSS base station using the Trimble R10 receiver sampling at 5 Hz. The base was installed over a temporary benchmark near known, but unrecovered, benchmark USLM 3651 1970 with a published solution (found at https://www.ngs.noaa.gov/OPUS/getDatasheet.jsp?PID=BBDJ67&ts=18215132934). This provided real-time kinematic (RTK) corrections to the Trimble R8s GNSS receiver (ground rover). The corrected base position was derived using the Online Positioning User Service, found at http://www.ngs.noaa.gov/OPUS/. The R8s positions were updated using post-processing kinematic (PPK) corrections in Trimble Business Center. DGGS measured 36 photo-identifiable ground control points (GCPs) with the ground rover, 18 of which were utilized for georeferencing during processing. The remaining 18 were reserved for quality control checks.\r\n\t\t\t\t20190828\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tPhotogrammetric dataset processing - During the survey, the UAV maintained RTK connection. Within the UAV GNSS receiver settings, the lever arm correction is automatically applied and camera GNSS coordinates are written to the image metadata in WGS84 ellipsoid. Yaw, pitch, and roll information are not written to the image metadata. During processing we update UAV positions using an X, Y, and Z shift from the initial to corrected base position. DGGS processed the data in Agisoft Metashape Professional software (Version 1.6.3 build 10732). We masked image corners where shadows and image warping were disruptive. Processing steps included aligning images, identifying GCPs, manually cleaning the sparse point cloud, optimizing the bundle block adjustment (refining camera position and lens distortion parameters), constructing the dense point cloud, building the DSM, and creating the orthomosaic image. During processing, we used 18 GCPs to create the model, leaving 18 GCPs as horizontal and vertical check points.\r\n\t\t\t\t2021\r\n\t\t\t\r\n\t\t\r\n\t\r\n\t\r\n\t\traster\r\n\t\r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tUniversal Transverse Mercator\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t3\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t0.999600\r\n\t\t\t\t\t\t\t-165\r\n\t\t\t\t\t\t\t0\r\n\t\t\t\t\t\t\t500000.000000\r\n\t\t\t\t\t\t\t0\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tcoordinate pair\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t.00000001\r\n\t\t\t\t\t\t.00000001\r\n\t\t\t\t\t\r\n\t\t\t\t\tMeters\r\n\t\t\t\t\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tNAD83 (2011)\r\n\t\t\t\tGRS 80\r\n\t\t\t\t6378137\r\n\t\t\t\t298.257222101000025\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tNAVD88, GEOID12B\r\n\t\t\t\t0.001\r\n\t\t\t\tmeters\r\n\t\t\t\tExplicit elevation coordinate included with horizontal coordinates\r\n\t\t\t\r\n\t\t\r\n\t\r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tdigital surface model\r\n\t\t\t\tThe DSM represents surface elevations such as the height of vegetation and buildings. We filtered the dense cloud to remove low confidence points with less than five contributing combined depth maps. Since water bodies can introduce noise, we manually delineated the river, pond, and beach boundaries to restrict the DSM to land only. Boundaries were identified using both visual selection from collected aerial images and point confidence. The DSM is a single-band, 32-bit floating point GeoTIFF file with a GSD of 0.054 m; the \"No Data\" value is set to -3.4028231 x 10^38.\r\n\t\t\t\tDGGS\r\n\t\t\t\tdigital surface model\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\torthoimagery\r\n\t\t\t\tThe orthoimage is a three-band (red, green, blue), 8-bit unsigned GeoTIFF file with a GSD of 0.027 m per pixel; the \"No Data\" value is set to 0.\r\n\t\t\t\tDGGS\r\n\t\t\t\torthoimagery\r\n\t\t\t\r\n\t\t\r\n\t\r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\r\n\t\t\t\tMetadata Manager\r\n\t\t\t\t\r\n\t\t\t\t\tmailing and physical\r\n\t\t\t\t\t
3354 College Road
\r\n\t\t\t\t\tFairbanks\r\n\t\t\t\t\tAK\r\n\t\t\t\t\t99709-3707\r\n\t\t\t\t\tUSA\r\n\t\t\t\t\r\n\t\t\t\t(907)451-5020\r\n\t\t\t\t(907)451-5050\r\n\t\t\t\tdggspubs@alaska.gov\r\n\t\t\t\t8 am to 4:30 pm, Monday through Friday, except State holidays\r\n\t\t\t\tPlease view our website (https://www.dggs.alaska.gov) for the latest information on available data. Please contact us using the e-mail address provided above when possible.\r\n\t\t\t\r\n\t\t\r\n\t\tRDF 2022-8\r\n\t\tThe State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.\r\n\t\t\r\n\t\t\tDGGS publications are available as free online downloads or you may purchase paper hard-copies or digital files on CD/DVD or other digital storage media by mail, phone, fax, or email from the DGGS Fairbanks office. To purchase this or other printed reports and maps, contact DGGS by phone (907-451-5020), e-mail (dggspubs@alaska.gov), or fax (907-451-5050). Payment accepted: Cash, check, money order, VISA, or MasterCard. Turnaround time is 1-2 weeks unless special arrangements are made and an express fee is paid. Shipping charge will be the actual cost of postage and will be added to the total amount due. Contact us for the exact shipping amount.\r\n\t\t\tContact DGGS for current pricing\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tDSM, Orthoimage\r\n\t\t\t\t\t20220311\r\n\t\t\t\t\tdigital surface model and orthoimagery\r\n\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\t\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\thttps://doi.org/10.14509/30857\r\n\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t\r\n\t\t\t\t\r\n\t\t\t\r\n\t\t\tFree download\r\n\t\t\r\n\t\r\n\t\r\n\t\t20220312\r\n\t\t\r\n\t\t\t\r\n\t\t\t\t\r\n\t\t\t\t\tAlaska Division of Geological & Geophysical Surveys\r\n\t\t\t\t\tSimone Montayne\r\n\t\t\t\t\r\n\t\t\t\tMetadata Manager\r\n\t\t\t\t\r\n\t\t\t\t\tmailing and physical\r\n\t\t\t\t\t
3354 College Road
\r\n\t\t\t\t\tFairbanks\r\n\t\t\t\t\tAK\r\n\t\t\t\t\t99709-3707\r\n\t\t\t\t\tUSA\r\n\t\t\t\t\r\n\t\t\t\t(907)451-5020\r\n\t\t\t\t(907)451-5050\r\n\t\t\t\tdggspubs@alaska.gov\r\n\t\t\t\t8 am to 4:30 pm, Monday through Friday, except State holidays\r\n\t\t\t\r\n\t\t\r\n\t\tFGDC Content Standard for Digital Geospatial Metadata\r\n\t\tFGDC-STD-001-1998\r\n\t\tIf the user has modified the data in any way they are obligated to describe the types of modifications they have performed in the supporting metadata file. User specifically agrees not to imply that changes they made were approved by the Alaska Department of Natural Resources or Division of Geological & Geophysical Surveys.\r\n\t\t\r\n\t\t\thttps://dggs.alaska.gov/metadata/dggs.ext\r\n\t\t\tdggs metadata extensions\r\n\t\t\r\n\t\r\n","source_transform":null,"status":"error"}