72139 Data Set Published / External 59025 NGS Lidar Project Completed 2024 This data was collected by Woolpert using a Leica HawkEye 4X sensor. The data was acquired on 20221029. The data includes topobathy data in an LAS 1.4 format file classified as unclassified (1), ground (2), low noise (7), topo water surface (9), high noise (18), bathymetric point (40), bathymetric water surface (41), synthetic derived water surface (42), submerged object (43), International Hydrographic Organization (IHO) S-57 object (44), submerged aquatic vegetation (64), and bathymetric bottom temporal changes (65) in accordance with project specifications. The lidar data in ellipsoid heights was used to create the final topobathymetric DEMs in ellipsoid heights. Lidar data classes 2, 40 and 43 were used to generate a raster in geotiff format, with 1 meter pixel resolution for the entire area. The raster was then clipped to the tile grid and named according to project specifications to result in tiled 5000m x 5000m topobathymetric DEMs. The project consists of approximately 6 square kilometers of data collected in Swains Island, American Samoa. This dataset contains 2 5000 m x 5000 m raster tiles. This data was collected to provide topographic/bathymetric lidar data, digital imagery, and digital shoreline for National Oceanic and Atmospheric Administration (NOAA) nautical charts and other uses. The full workflow used for this project is found in the final project report submitted to NOAA. Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION Theme ISO 19115 Topic Category elevation Spatial Global Change Master Directory (GCMD) Location Keywords OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > AMERICAN SAMOA Office for Coastal Management Charleston SC Data Set Elevation None Planned Model (digital) Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the National Geodetic Survey, the Office for Coastal Management, or its partners. We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these data in a report, publication, or presentation. Data Steward 2024 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Distributor 2024 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Metadata Contact 2024 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Originator 2024 Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ Ground Condition -171.1 -171.045 -11.03 -11.09 Discrete 2022-10-29 Yes Geographic 3D EPSG:6321 NAD83(PA11) NAD83 (National Spatial Reference System PA11) 6378137 298.257222101 1 Geodetic Lattitude Lat degree north 2 Geodetic Longitude Lon degree east 3 Elipsoidal height h metre up Unclassified None 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. https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=10089 2024 Organization NOAA Office for Coastal Management Customized Download Create custom data files by choosing data area, product type, map projection, file format, datum, etc. ZIP Not Applicable Zip https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/dem/NGS_Swains_AS_Topobathy_2022_10089/index.html 2024 Organization NOAA Office for Coastal Management Bulk Download Simple download of data files. LAZ GeoTIFF https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/10088/supplemental/extent_AS_swains_m10088.kmz Browse Graphic Browse Graphic kmz This graphic shows the lidar footprint for this dataset. https://coast.noaa.gov/dataviewer Digital Coast Data Access Viewer Online Resource https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid12b/10088/supplemental/AS2201_AmericanSamoa_QualityAssuranceReport.pdf Topobathy Lidar Data Report Online Resource pdf Topobathymetric Lidar Data Report OS Independent Woolpert performed acquisition and calibration of all lidar data, as well as classification, generation of derivative products, and absolute positional accuracy computation. The DEMs are derived from the source lidar and inherit the accuracy of the source data. The DEMs are created using controlled and tested methods to limit the amount of error introduced during DEM production. Woolpert performed acquisition and calibration of all lidar data, as well as classification, generation of derivative products, and absolute positional accuracy computation. The DEMs are derived from the source lidar and inherit the accuracy of the source data. The DEMs are created using controlled and tested methods to limit the amount of error introduced during DEM production. Due to the remoteness of the area, no control points were collected on Swains Island. However, a daily QC line was flown over the Pago Pago International Airport every mission and compared to RTK points. On average, lines were -0.027m seperated from RTK points. This dataset encompasses 2 5000m x 5000m tiles. Not applicable Yes Unknown Yes NCEI-CO Data is backed up to tape and to cloud storage. Acquisition and Processing Organization Woolpert Originator 1 Woolpert acquired, calibrated, and performed the refraction correction of the lidar data. Light travels at different speeds in air versus water and its direction of travel or angle is changed or refracted when entering the water column. The refraction correction process corrects for this difference by adjusting the depth (distance traveled) and horizontal position (change of angle/direction) of the lidar data acquired within water. Relative accuracy of the swaths compared to overlapping and adjacent swaths was verified through the use of Delta-Z (DZ) orthos created in LASTools software. Profiles of elevated planar features, such as roofs, were used to verify horizontal alignment between overlapping swaths. The NovAtel software was utilized for GPS and inertial processing, Data were processed to an initial LAS format using the Leica Lidar Survey Studio software. Algorithms in TerraScan was used to create the initial ground surface. All lidar data was peer-reviewed. QAQC also included creating void polygons for use during review. All necessary edits were applied to the dataset. LASTools was used to update LAS header information, including all projection and coordinate reference system information. The final lidar data is in LAS format 1.4 and point data record format 6. 2023-07-31T00:00:00 Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ 2 The National Oceanic and Atmospheric Administration (NOAA) received files in laz format. The data is in UTM Zone 2S coordinates and ellipsoid elevations in meters. Horizontal Datum-NAD83 (PA11) epoch: 2010.0 Projection-UTM Zone 2 South Horizontal Units-meters Vertical Datum-NAD83 (PA11) Ellipsoid height Vertical Units-meters The final classification scheme is as follows: 1-Unclassified 2-Ground 7-Low Noise 9-Topo Water Surface 18-High Noise 40-Bathymetric Point 41-Bathymetric Water Surface 42-Synthetic Derived Water Surface 43-Submerged Object 44-International Hydrographic Organization (IHO) S-57 Object 64-Submerged Aquatic Vegetation 65-Bathymetric Bottom Temporal Changes The lidar data is referenced to the NAD83 (PA11) ellipsoid. The lidar data in ellipsoid heights was used to create the final topobathymetric DEMs in ellipsoid heights. Lidar data classes 2, 40 and 43 were used to generate a raster in geotiff format, with 1 meter pixel resolution for the entire area. The raster was then clipped to the tile grid and named according to project specifications to result in tiled 5000m x 5000m topobathymetric DEMs. Bathy void polygons represent bathymetric areas with no bathymetric bottom returns and accompany the DEMs. Void polygon creation is described in the final project report. 2023-07-31T00:00:00 Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ gov.noaa.nmfs.inport:72139 Maryellen Sault 2024-02-13T19:54:12 SysAdmin InPortAdmin 2026-03-04T19:17:17 2024-03-06 National Geodetic Survey NGS 1002 Public No No 2022-04-11 3 Years 2025-04-11