{"action":"create","ckan_id":null,"date_created":"Wed, 08 Apr 2026 06:54:17 GMT","date_finished":null,"harvest_job_id":"abb06220-7a4b-40a2-ac1f-706b64ae3bfc","harvest_source_id":"f4c7bbab-c7ef-4277-a7d3-c25b78854814","id":"33c9dde0-941b-41d9-96cf-8913f6699f21","identifier":"https://dggs.alaska.gov/webpubs/metadata/RDF2022-13.xml","parent_identifier":null,"source_hash":"5ceba2bcf5323c25f2c33a182aafe9be030fa08543a72837bb54c16bd2662296","source_raw":"\r\n\r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tBogardus, R.C.\r\n\t\t\t\tGlenn, R.J.T.\r\n\t\t\t\tNessel, O.B.\r\n\t\t\t\tMaio, C.V.\r\n\t\t\t\tHoren, K.C.\r\n\t\t\t\t2022\r\n\t\t\t\tPhotogrammetry-derived orthoimagery and elevation data for Pilot Point, Alaska, collected June 1-3, 2021\r\n\t\t\t\tdata\r\n\t\t\t\t\r\n\t\t\t\t\tRaw Data File\r\n\t\t\t\t\tRDF 2022-13\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\t4 p.\r\n\t\t\t\thttps://doi.org/10.14509/30905\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\tPhotogrammetry-derived orthoimagery and elevation data for Pilot Point, Alaska, collected June 1-3, 2021, Raw Data File 2022-13, uses low-altitude aerial images, collected from an unmanned aerial vehicle (UAV) on June 1 and June 3, 2021, and Structure-from-Motion (SfM) photogrammetry to produce a digital surface model (DSM) and orthoimagery for the community of Pilot Point, Alaska. The orthoimage and elevation data are for assessing coastal hazards and changes. We used Trimble Business Center to process the Global Navigation Satellite System (GNSS) data used for positional control and NOAA VDatum to adjust elevation data. We used Agisoft Metashape to process photogrammetry data. 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/10.14509/30905).\r\n\t\t\tThe orthoimage and elevation data were collected for assessing coastal hazards and changes.\r\n\t\t\t>digital surface model: The DSM represents surface elevations such as the height of vegetation and buildings. Since water bodies can introduce noise, we selectively removed areas manually where inland water bodies introduced excessive noise. The DSM is a single-band, 32-bit floating point GeoTIFF file with a GSD of 0.13 m; the No Data value is set to -32767.\t\r\n>orthoimagery: The orthoimage is a three-band (red, green, blue), 16-bit unsigned GeoTIFF file with a GSD of 0.065 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\t20220601\r\n\t\t\t\t\t20220603\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-157.603124\r\n\t\t\t\t-157.588624\r\n\t\t\t\t57.615181\r\n\t\t\t\t57.594345\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 Plain\r\n\t\t\t\tCoastal and River\r\n\t\t\t\tCoastal and River Hazards\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\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\tGeology\r\n\t\t\t\tGeomorphology\r\n\t\t\t\tGeophysics\r\n\t\t\t\tGeotechnical\r\n\t\t\t\tHazards\r\n\t\t\t\tMarine Geology\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\tShoreface\r\n\t\t\t\tSurface\r\n\t\t\t\tSurface Water\r\n\t\t\t\tSurficial\r\n\t\t\t\tSurficial Geology\r\n\t\t\t\tWater\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\tPilot Point\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
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\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 Native Village of Pilot Point for funding supporting the creation of these data products. These data were produced by the University of Alaska Fairbanks Arctic Coastal Geoscience Lab (UAF-AGCL). The DGGS Coastal Hazards Program and UAF-AGCL work collaboratively to collect baseline data in Alaska communities and to produce raw data file publications for public access and archiving.\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\tOverbeck, J.R.\r\n\t\t\t\t2018\r\n\t\t\t\tCoastal flooding & erosion in Alaska\r\n\t\t\t\t\r\n\t\t\t\t\tInformation Circular\r\n\t\t\t\t\tIC 68\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/10.14509/30057\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\tACGL 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 relaease 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 19 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, 0.073 m See accompanying report for a table of checkpoints and further discussion of factors impacting the certainty of data locations.\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. The RMS error of Z offsets is 0.083 m. The total error of the DSM (X, Y, and Z) is 0.111 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 - ACGL used a DJI Phantom 3 Advanced UAV with an FC300S camera model (3.61 mm lens) to collect 12-megapixel JPEG photographs (4000 x 3000 pixels per image). We flew the aerial survey with 80 percent sidelap and 80 percent frontlap, 120 m above the ground at between 7.5 m/s, with nadir orientation stabilized using a 3-axis gimbal. This resulted in 788 images covering 0.6 km2 with ground sampling distance (GSD) of 0.07 m. ACGL conducted flights between June 1 and June 3, 2021, from 10:00 AM to 4:00 PM AKDT. The operator returned the UAV four times to change batteries. The weather throughout the survey was favorable with little to no clouds, no rain, and no wind. No abnormalities were observed during the flights.\r\n\t\t\t\t20220603\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tGround survey - ACGL set up a GNSS base station using the Trimble R8 receiver sampling at 1 Hz. The base was installed over a temporary benchmark of unknown position. This provided real-time kinematic (RTK) corrections to the UAV and Trimble R2 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 R2s' positions were updated using post-processing kinematic (PPK) corrections in Trimble Business Center. ACGL measured 117 photo-identifiable ground control points (GCPs) with the ground rover, 98 of which were utilized for georeferencing during processing. The remaining 19 were reserved for quality control checks.\r\n\t\t\t\t2022\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. ACGL processed the data in Agisoft Metashape Professional software (Version 1.5.5 build 7618). 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 98 GCPs to create the model, leaving 19 GCPs as horizontal and vertical check points.\r\n\t\t\t\t2022\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\t4\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-159\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\t298.257222101\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. Since water bodies can introduce noise, we selectively removed areas manually where inland water bodies introduced excessive noise. The DSM is a single-band, 32-bit floating point GeoTIFF file with a GSD of 0.13 m; the No Data value is set to -32767.\r\n\t\t\t\tACGL\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), 16-bit unsigned GeoTIFF file with a GSD of 0.065 m per pixel; the No Data value is set to 0.\r\n\t\t\t\tACGL\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 2022-13\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\tdata\r\n\t\t\t\t\t20221114\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/10.14509/30905\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\t20221114\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"}