{"action":"create","ckan_id":null,"date_created":"Wed, 11 Feb 2026 05:26:32 GMT","date_finished":null,"harvest_job_id":"3fc6d38a-714f-4388-8c6f-9d4e07a27820","harvest_source_id":"f4c7bbab-c7ef-4277-a7d3-c25b78854814","id":"4f830418-713e-44be-9c7a-b3c6814cb2a8","identifier":"https://dggs.alaska.gov/webpubs/metadata/RDF2020-16.xml","parent_identifier":null,"source_hash":"6cbe0553c6fd677f0eec5ce28f883ea5492a73ddf0e388a4cab46f16540fec82","source_raw":"\r\n\r\n\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tWikstrom Jones, Katreen\r\n\t\t\t\tWolken, G.J.\r\n\t\t\t\tDaanen, R.P.\r\n\t\t\t\tHerbst, A.M.\r\n\t\t\t\t2021\r\n\t\t\t\tLidar-derived elevation data for Turnagain Pass, southcentral Alaska, September 2, 2018\r\n\t\t\t\treport, point cloud, GeoTIFF\r\n\t\t\t\t\r\n\t\t\t\t\tRaw Data File\r\n\t\t\t\t\tRDF 2020-16\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\t7 p.\r\n\t\t\t\thttps://doi.org/10.14509/30567\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\tThe State of Alaska Division of Geological & Geophysical Surveys (DGGS) used lidar to produce a digital terrain model (DTM) and digital surface model (DSM) of Turnagain Pass, southcentral Alaska, during snow-free ground conditions. This dataset includes point cloud data, a 32-bit digital terrain model and digital surface model, and an intensity image covering Turnagain Pass located southeast of Anchorage within the Chugach National Forest on the Kenai Peninsula in southcentral Alaska. The lidar and Global Navigation Satellite System (GNSS) data were collected on September 2, 2018, and processed using Terrasolid. This data collection is released as a Raw Data File with an open end-user license. All files can be downloaded free of charge from the Alaska Division of Geological & Geophysical Surveys website: http://doi.org/10.14509/30567\r\n\t\t\tThe goal of the survey is to provide snow-free surface elevations for deriving snow depth distribution models with repeat surveys during snow-covered surface conditions. This data release is one of a series of DGGS publications to present elevation data.\r\n\t\t\t\r\n\t\t\t\t>classified point cloud data: The ground-classified point cloud has an average point spacing of 43 cm (43 cm on the ground in open alpine areas and 32 cm below dense vegetation in the valley) and an average point density of 2.3 points per square meter. \t\r\n\t\t\t\t>digital surface model: The DSM represents surface elevations, for example heights of vegetation, buildings, bridges, etc. The DSM is a single band, 32-bit GeoTIFF file, with a ground sample distance of 50 cm. No Data value is set to -3.40282306074e+038.\t\r\n\t\t\t\t>digital terrain model: The DTM represents elevations of ground surfaces, excluding vegetation, bridges, buildings, etc. The DTM is a single-band, 32-bit float GeoTIFF file, with a ground sample distance of 50 cm. No Data value is set to -3.40282306074e+038.\t\r\n\t\t\t\t>lidar intensity image: The intensity image represents the return strengths of the first return laser pulses. The intensity image is a single band, 32-bit GeoTIFF file, with a ground sample distance of 50 centimeter and normalized to the 0-255 range. No Data value is set to -3.40282306074e+038.\r\n\t\t\t\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\t20180902\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-149.331846\r\n\t\t\t\t-149.022184\r\n\t\t\t\t60.866217\r\n\t\t\t\t60.707115\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\tDigital Elevation Model\r\n\t\t\t\tDigital Surface Model (DSM)\r\n\t\t\t\tEngineering\r\n\t\t\t\tEngineering Geology\r\n\t\t\t\tGeologic\r\n\t\t\t\tGeology\r\n\t\t\t\tGeomorphology\r\n\t\t\t\tGeotechnical\r\n\t\t\t\tLiDAR\r\n\t\t\t\tPoint Cloud Data\r\n\t\t\t\tRemote Sensing\r\n\t\t\t\tSurficial\r\n\t\t\t\tSurficial Geology\r\n\t\t\t\tTopography\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\tBench Creek\r\n\t\t\t\tBertha Creek\r\n\t\t\t\tCenter Creek\r\n\t\t\t\tEast Fork Sixmile Creek\r\n\t\t\t\tGranite Creek\r\n\t\t\t\tIngram Creek\r\n\t\t\t\tKickstep Mountain\r\n\t\t\t\tLynx Creek\r\n\t\t\t\tLyon Creek\r\n\t\t\t\tPetes Creek\r\n\t\t\t\tSpokane Creek\r\n\t\t\t\tTaylor Creek\r\n\t\t\t\tTincan Creek\r\n\t\t\t\tTincan Peak\r\n\t\t\t\tTurnagain Arm\r\n\t\t\t\tTurnagain Pass\r\n\t\t\t\tWolverine Creek\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\tThese data products were funded by U.S. Geological Surveys and Alaska Department of Natural Resources, Division of Geological & Geophysical Surveys. We thank Clearwater Air for their aviation expertise and contribution to these data products.\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tWolken, G.J.\r\n\t\t\t\tBalazs, M.S.\r\n\t\t\t\t2014\r\n\t\t\t\tInventory and preliminary assessment of geologic hazards in the Passage Canal-Portage Valley area, south-central Alaska\r\n\t\t\t\t\r\n\t\t\t\t\tPreliminary Interpretive Report\r\n\t\t\t\t\tPIR 2014-1\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/10.14509/27302\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tWolken, G.J.\r\n\t\t\t\tHendricks, K.A.\r\n\t\t\t\tDaanen, R.P.\r\n\t\t\t\tOverbeck, J.R.\r\n\t\t\t\tStevens, D.S.P.\r\n\t\t\t\tMasterman, S.S.\r\n\t\t\t\t2017\r\n\t\t\t\tAlaska & climate change\r\n\t\t\t\t\r\n\t\t\t\t\tInformation Circular\r\n\t\t\t\t\tIC 64\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/10.14509/29781\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\tRelative accuracy for this dataset was evaluated as the interswath overlap consistency and was measured at 1.2 cm RMSE.\r\n\t\tThis data release is complete and there is no over collect, except for the aircraft turns that were eliminated from the dataset. There are a few areas where data coverage is limited due to laser range exceedance, which is related to the slow response of the fixed wing aircraft to the fast elevation change along the flight path. All low points and air points were eliminated from the dataset.\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tHorizontal accuracy was not measured for this collection.\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tThe elevation values of 62 ground control points were compared with the elevation values of the lidar points classified as ground points. The average vertical offset was corrected with a z-transformation. 15 check points were used to determine the final accuracy of the z-transformed lidar point cloud. The lidar point cloud had a vertical offset of +2.2 cm (root mean squared error [RMSE] 3.6 cm) compared to ground control, therefore a vertical transformation of -2.2 cm was applied to the lidar point cloud. The final accuracy assessment showed a mean vertical offset of -0.3 cm and RMSE of 3.3 cm. Relative accuracy for this dataset was evaluated as the interswath overlap consistency and was measured at 1.2 cm RMSE.\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tAirborne survey - This lidar survey was flown at an average elevation of 200 m above ground level and a ground speed of approximately 40 meters per second with a fixed-wing Cessna 180. Elevation data were acquired with a Riegl VUX1-LR laser scanner integrated with a GNSS and Northrop Grumman IMU system. The integration was designed by Phoenix LiDAR systems. Lidar data were acquired at a pulse rate ranging from 50,000 pulses per second in the alpine areas to 400,000 pulses per second over forested areas, a scan rate of 200 revolutions per second, and a scan angle range of 80-280 degrees. The accompanying report provides additional detail regarding flight conditions.\r\n\t\t\t\t20180902\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tGround survey - Ground control and check points were collected on September 2, 2018. A Trimble R7 GNSS receiver with Zephyr-2 antenna was deployed near the center of the study area and provided a base station occupation and real-time kinematic (RTK) corrections to points surveyed with a rover Trimble R8-4 GNSS receiver (internal antenna). 78 total ground control points and check points were collected to be used for calibration and assessment of the vertical accuracy of the point cloud. All points were collected on a paved road surface.\r\n\t\t\t\t20180902\r\n\t\t\t\r\n\t\t\t\r\n\t\t\t\tLidar dataset processing - Raw data were processed using Terrasolid software to produce integrated files for navigation correction and a point cloud for calibration. The navigation was corrected using Inertial Explorer software, where the GNSS and IMU data are integrated to establish correct flight path and orientation of the lidar sensor. Internal consistency of the dataset was improved by calibrating the point cloud data using global, flight line, and fluctuation (within individual flightlines) tielines in Terrasolid software. The point cloud was classified for ground points as well as low, medium, and high vegetation (0.01-0.5 m, 0.5-3 m, and 3-60 m heights above the ground, respectively, in accordance with ASPRS lidar classification codes). Some manual processing was required to eliminate erratically placed points and misclassified ground points. All low points and air points were eliminated from the dataset. A LAS dataset was created in ArcMAP, from which a 50 cm DTM, DSM, and intensity image were produced. The DTM was derived from elevation values of ground-classified points only, and built using the binning technique of minimum elevation and linear void fill. The DSM was derived from elevation values from first returns from all point classes, and built using the binning technique of average elevation values and linear void fill. The intensity image was derived from intensity values of first return points.\r\n\t\t\t\t2019\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\t6\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-147\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\tclassified point cloud data\r\n\t\t\t\tThe ground-classified point cloud has an average point spacing of 43 cm (43 cm on the ground in open alpine areas and 32 cm below dense vegetation in the valley) and an average point density of 2.3 points per square meter.\r\n\t\t\t\tAlaska Division of Geological & Geophysical Surveys (DGGS)\r\n\t\t\t\tclassified point cloud data\r\n\t\t\t\r\n\t\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, for example heights of vegetation, buildings, bridges, etc. The DSM is a single band, 32-bit GeoTIFF file, with a ground sample distance of 50 cm. No Data value is set to -3.40282306074e+038.\r\n\t\t\t\tAlaska Division of Geological & Geophysical Surveys (DGGS)\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\tdigital terrain model\r\n\t\t\t\tThe DTM represents elevations of ground surfaces, excluding vegetation, bridges, buildings, etc. The DTM is a single-band, 32-bit float GeoTIFF file, with a ground sample distance of 50 cm. No Data value is set to -3.40282306074e+038.\r\n\t\t\t\tAlaska Division of Geological & Geophysical Surveys (DGGS)\r\n\t\t\t\tdigital terrain model\r\n\t\t\t\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\t\t\tlidar intensity image\r\n\t\t\t\tThe intensity image represents the return strengths of the first return laser pulses. The intensity image is a single band, 32-bit GeoTIFF file, with a ground sample distance of 50 centimeter and normalized to the 0-255 range. No Data value is set to -3.40282306074e+038.\r\n\t\t\t\tAlaska Division of Geological & Geophysical Surveys (DGGS)\r\n\t\t\t\tlidar intensity image\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 2020-16\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\treport, point-cloud, GeoTIFF\r\n\t\t\t\t\t20210121\r\n\t\t\t\t\tclassified point cloud data, digital surface model, digital terrain model, and lidar intensity image\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/10.14509/30567\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\t20210122\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"}