gov.noaa.nmfs.inport:71901 eng UTF8 dataset Elevation Office for Coastal Management resourceProvider NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact 2026-04-30T00:00:00 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) EPSG::5703 EPSG::6332 EPSG::6334 1950 - 2023 NOAA Seamless Topobathy DEM (Compiled 2023): Kachemak, Point Hope, Teller, AK ak2023_kach_pthope_teller_dem_m10032 2023 creation 2023-12-20 publication NOAA/NMFS/EDM 71901 https://www.fisheries.noaa.gov/inport/item/71901 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/OCM_Kach_Teller_PtHope_AK_DEM_2023_10032/supplemental/NOAA_Axim_TCarta_SeamlessTopobathyDEMPilot_Kachemak_Teller_PointHope_Revision03DPR_508OCM.pdf WWW:LINK-1.0-http--link Lidar Report Link to the TCarta/Axim lidar report. download https://coast.noaa.gov/dataviewer/ WWW:LINK-1.0-http--link NOAA's Office for Coastal Management (OCM) Data Access Viewer (DAV) The Data Access Viewer (DAV) allows a user to search for and download elevation, imagery, and land cover data for the coastal U.S. and its territories. The data, hosted by the NOAA Office for Coastal Management, can be customized and requested for free download through a checkout interface. An email provides a link to the customized data, while the original data set is available through a link within the viewer. download NOAA Seamless Topobathy Digital Elevation Model Pilot Incorporating Satellite-Derived Bathymetry - Kachemak, Teller, Point Hope, Alaska, project number 1305M223FNCNP0283DPR. Seamless topographic-bathymetry models were produced for three AOIs along the Alaskan coast, integrating multiple source datasets including bathymetric lidar, topographic lidar, multibeam and singlebeam echosounder, IFSAR, and satellite-derived bathymetry (SDB). Satellite-derived bathymetry was produced using empirical and physics-based radiative transfer models, derived from Maxar and Planet Labs mutlispectral imagery. All data sources were adjusted from MLLW to NAVD88 before integrating to a weighted grid, with weights assigned based on quality and data currency. The weighted grid was then interpolated utilizing Generic Mapping Tools (GMT) surface module, leveraging a spline-in-tension interpolation. DEMs were delivered at 2m resolution. Each DEM delivery includes ancillary files including an in situ source map raster, a known issue polygon feature class, source imagery utilized for SDB production, the individual SDB rasters integrated with the topographic-bathymetry model. Kachemak AOI covers approximately 1012 km2 Point Hope AOI covers approximately 2329 km2 Teller AOI covers approximately 1160 km2 Procured for NOAA Office for Coastal Management, the primary objective of this project was to fill bathymetric data gaps according to the Alaska Mapping Executive Committee (AMEC). This objective was to be achieved through acquiring new Satellite Derived Bathymetric (SDB) data in the assigned areas of interest (AOI), with the goal of expanding bathymetric data coverage beyond the current coverage from sonar and LiDAR datasets. Additionally, to create a seamless topographic-bathymetric digital elevation model (DEM) using existing topographic-bathymetric LiDAR, sonar bathymetry, terrestrial LiDAR, Interferometric Synthetic Aperture Radar (iFSAR), and TCarta SDB data. This was a pilot project to demonstrate how SDB can be used to fill in data gaps in hard to map areas due to accessibility, prohibitive cost associated with ship-based and LiDAR surveys, narrow windows of opportunities to perform survey work due to environmental and harsh weather conditions, and potential risks to operators surveying in these remote and unsurveyed areas. TCarta Marine LLC, NOAA Office for Coastal Management (OCM) completed NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information pointOfContact NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information custodian notPlanned EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > DIGITAL ELEVATION/TERRAIN MODEL (DEM) EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY > COASTAL BATHYMETRY EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION theme Global Change Master Directory (GCMD) Science Keywords 23.3 CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA VERTICAL LOCATION > LAND SURFACE place Global Change Master Directory (GCMD) Location Keywords 23.3 LIDAR > Light Detection and Ranging instrument Global Change Master Directory (GCMD) Instrument Keywords 23.3 Airplane > Airplane platform Global Change Master Directory (GCMD) Platform Keywords 23.3 DOC/NOAA/NOS/OCM > Office of Coastal Management, National Ocean Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 DEMs project InPort otherRestrictions Cite As: Office for Coastal Management, [Date of Access]: 1950 - 2023 NOAA Seamless Topobathy DEM (Compiled 2023): Kachemak, Point Hope, Teller, AK [Data Date Range], https://www.fisheries.noaa.gov/inport/item/71901. NOAA provides no warranty, nor accepts any liability occurring from any incomplete, incorrect, or misleading data, or from any incorrect, incomplete, or misleading use of the data. It is the responsibility of the user to determine whether or not the data is suitable for the intended purpose. otherRestrictions Access Constraints: None otherRestrictions Use Constraints: Users should be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions. Users should not use this data for critical applications without a full awareness of its limitations. otherRestrictions Distribution Liability: Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners. unclassified grid eng; US elevation Python 3.10; Esri ArcGIS Pro 3.1; TCarta Trident Tools; Pure File Magic v6.4.0.43; Generic Mapping Tools 6.0 -167.39811989563 -165.94523956925 68.02897429398 68.51960420703 Point Hope Dates of collection for Point Hope. The Point Hope DEM was created from a compilation of hydro surveys from 1961 to satellite derived bathymetry (SDB) collected in 2023. Hydro Surveys: 1961-07-22 to 2020-10-24 Topobathy Lidar: 2019 Topo Lidar: 2004, 2018 IfSAR: 2012-07-21 SDB: 2015-06-22, 2019-06-12, 2023-08-28, 2023-09-23 TCarta produced bathymetry from ICESat-2: 2022 | Currentness: Ground Condition 1961-07-22 2023-09-23 -151.8 -150.88 59.39 59.83 Kachemak Dates of collection for Kachemak. The Kachemak DEM was created from a compilation of hydro surveys from 1980 to satellite derived bathymetry (SDB) collected in 2022. Hydro Surveys: 1980-05-06 to 2009-09-08 Topobathy Lidar: 2018, 2019 Topo Lidar: 2008 IfSAR: 2014-08-29 to 2014-09-12 SDB: 2018-09-20, 2019-04-15, 2019-05-24, 2021-07-25, 2022-05-28 | Currentness: Ground Condition 1980-05-06 2022-05-28 -167.13 -166 65.01 65.39 Teller Dates of collection for Teller. The Teller DEM was created from a compilation of hydro surveys from 1950 to satellite derived bathymetry (SDB) collected in 2022. Hydro Surveys: 1950-01-01 to 2017-09-04 Topobathy Lidar: 2019 IfSAR: 2012-07-04 to 2012-07-12 SDB: 2015-06-18, 2017-08-10, 2020-06-16, 2022-07-13, 2022-08-02 TCarta produced bathymetry points from ICESat-2: 2022 | Currentness: Ground Condition 1950-01-01 2022-08-02 Zip GeoTIFF Uncompressed NOAA Office for Coastal Management (843) 740-1202 2234 South Hobson Ave Charleston SC 29405-2413 coastal.info@noaa.gov https://coast.noaa.gov WWW:LINK-1.0-http--link NOAA Office for Coastal Management Website NOAA Office for Coastal Management Home Page information distributor https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10032/details/10032 WWW:LINK-1.0-http--link Customized Download Create custom data files by choosing data area, map projection, file format, etc. A new metadata will be produced to reflect your request using this record as a base. download https://noaa-nos-coastal-lidar-pds.s3.us-east-1.amazonaws.com/dem/OCM_Kach_Teller_PtHope_AK_DEM_2023_10032/index.html WWW:LINK-1.0-http--link Bulk Download Bulk download of data files in the original coordinate system. download dataset Vertical Positional Accuracy To assess the vertical accuracy of the DEMs, a set of 3,000 randomly sampled points from each of the AOI's non-SDB bathymetry sources were collected. The elevation of each point was compared to the coincident DEM elevation, deriving absolute error, and absolute percent error. From these point statistics, an overall assessment of vertical accuracy was established. Kachemak - 1.17 m RMSE Teller - 0.51 m RMSE Point Hope - 0.12 m RMSE Completeness Report Complete Conceptual Consistency Imbricate source insitu sources were deconflicted where possible utilizing spatial autocorrelation thresholding. All Satellite-Derived Bathymetry (SDB) including in the DEM was processed in a 3D-point cloud environment to remove spurious returns and outliers. TCarta/Axim created seamless topographic-bathymetry models for three AOIs along the Alaskan coast, integrating multiple source datasets including bathymetric lidar, topographic lidar, multibeam and singlebeam echosounder, IFSAR, and satellite-derived bathymetry (SDB) for the NOAA Office for Coastal Management (OCM). OCM processed the DEMs to make them available for custom and bulk download from the NOAA Digital Coast Data Access Viewer (DAV). All source data contributing to the topographic bathymetry models were, when necessary, corrected to NAVD88 vertical datum utilizing an internal Ellipsoidally Referenced Tide Datum Model (ERTDM) to perform the VDatum transformation from MLLW to NAVD88 (GEOID12). A MLLW - NAVD88 (GEOID 12) triangulated mesh covering all the Alaska tidal benchmarks was the basis for this model, provided by NOAA's Coast Survey Development Lab. Seamless topographic-bathymetry models were produced for three AOIs along the Alaskan coast, integrating multiple source datasets including bathymetric lidar, topographic lidar, multibeam and singlebeam echosounder, IFSAR, and satellite-derived bathymetry (SDB). Satellite-derived bathymetry was produced using empirical and physics-based radiative transfer models, derived from Maxar and Planet Labs mutlispectral imagery. All data sources were adjusted from MLLW to NAVD88 before integrating to a weighted grid, with weights assigned based on quality and data currency. The weighted grid was then interpolated utilizing Generic Mapping Tools (GMT) surface module, leveraging a spline-in-tension interpolation. DEMs were delivered at 2m resolution. For more details about the processing to create the DEMs, refer to the TCarta report which is accessible via the lidar report link in the URL section of this metadata record. The NOAA Office for Coastal Management (OCM) received 3 GeoTiff files for the Kachemak, Point Hope and Teller AOIs from TCarta/Axim. The raster files were at a 2 m grid spacing. The data were in UTM Zone 3N (Point Hope, Teller) and UTM Zone 5N (Kachemak) NAD83 (2011), meters coordinates and NAVD88 elevations in meters. OCM assigned the appropriate EPSG codes (Horiz - 6332, 6334, Vert - 5703) and copied the raster files to AWS S3 for Digital Coast storage and provisioning purposes. 2024-01-22T00:00:00 Office for Coastal Management processor IfSAR USGS publisher IfSAR and Lidar AK DGGS publisher Source Contribution: Imagery was selected from the Maxar WorldView and GeoEye, and Planet imagery archives, with the best and most recently available imagery being given priority to create satellite derived bathymetry (SDB). Imagery from Maxar WorldView, GeoEye, Planet Single and Multibeam Sonar NCEI publisher TCarta ICESat-2 Bathymetry TCarta originator Topobathy Lidar NOAA OCM publisher