71104 Data Set Published / External 59025 NGS Lidar Project Completed 2023 These data were collected by the National Oceanic Atmospheric Administration National Geodetic Survey Remote Sensing Division using a Leica Chiroptera 4X system. The data were acquired from 20220605 - 20220723. The data includes topobathy data in an LAS 1.4 format file classified as unclassified (1), ground (2), noise (7), water surface (topographic sensor) (9), high noise (18), bathymetric point (40), water surface (41), synthetic water surface (42), submerged feature (43), and submerged aquatic vegetation (46) in accordance with the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards. This data set may also include lidar intensity values. This lidar data are an ancillary product of NOAA's Coastal Mapping Program (CMP), created through a wider Integrated Ocean and Coastal Mapping initiative to increase support for multiple uses of the data. It is not intended for mapping, charting, or navigation. In addition, it will be used for ongoing research efforts for testing and developing standards for airborne lidar. 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 > BATHYMETRY > COASTAL BATHYMETRY 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 CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MASSACHUSETTS Instrument Global Change Master Directory (GCMD) Instrument Keywords LIDAR > Light Detection and Ranging Platform Global Change Master Directory (GCMD) Platform Keywords Airplane > Airplane 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. 72022 Published / External Completed Other Yes Class table describing the class numbers used in the lidar data file. Each point in the lidar file has a class associated. 2 1 - Unclassified Point class number No No Active Unclassified point 3 2- Ground Point class number No No Active Ground Point 4 7 - Low Point (Noise) Point class number No No Active Low Point (Noise) 5 9 - Water Point class number No No Active Water Point 6 18 - High Noise Point class number No No Active Refracted high water point 11 40 - Bathymetric Point Point class number No No Active point classified as bathymetric ground. 13 41 - Water Surface Point class number No No Active Point classified as water surface. 14 42 - Derived Water Surface Point class number No No Active Derived water surface (synthetic water surface location used in computing refraction at water surface). 15 43 - Submerged Object Point class number No No Active Submerged object, not otherwise specified (e.g., wreck, rock, submerged piling) 16 46 - Submerged Vegetation Point class number No No Active Point classified as submerged vegetation. Data Steward 2023 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 2023 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 2023 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 2023 Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ Ground Condition -70.168 -69.867 41.827 41.437 Range 2022-06-05 2022-07-23 Yes Geographic 3D EPSG:6319 NAD83(2011) NAD83 (National Spatial Reference System 2011) GRS 1980 6378137 298.257222101 1 Geodetic Latitude Lat degree north 2 Geodetic Longitude Lon degree east 3 Elipsoidal height h metre up Unclassified Data is available online for bulk and custom downloads. 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=9962 2023 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 Zip https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9962/index.html 2023 Organization NOAA Office for Coastal Management Bulk Download Simple download of data files. LAZ LAS/LAZ - LASer Zip https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/9962/supplemental/extent_ngs_2021_gloucester_m9962.kmz Browse Graphic Browse Graphic kmz This graphic shows the lidar footprint for this dataset. OS Independent Absolute accuracy was assessed using Non-Vegetated Vertical Accuracy (NVA) survey methods. Survey check points were evenly distributed as feasible throughout the project area. NVA compares known ground check point data that were withheld from the calibration and post-processing of the lidar point cloud to the triangulated surface generated by the ground classified lidar point cloud. NVA is a measure of the accuracy of lidar point data in open areas with level slope (less than 20 degrees) where the lidar system has a high probability of measuring the ground surface and is evaluated at the 95% confidence interval (1.96*RMSE). The non-vegetated vertical accuracy tested 0.069m at the 95% confidence interval. Data covers 2038 tiles (500m x 500m tiles). Not applicable Yes Unknown Yes NCEI-CO Data is backed up to tape and to cloud storage. Acquisition and Processing Organization National Geodetic Survey Originator 1 Data were processed to an initial LAS format using the Leica Lidar Survey Studio (LSS) software. The NovAtel Inertial Explorer software was utilized for GPS and inertial processing. Water refraction correction was applied to returns below the water surface within LSS. Data were then combined into 500m x 500m tiles. GeoCue, Terrasolid, and LP360 software was used for data visualization, 3D editing, and export to final LAS file. Final data were exported in LAS 1.4 format in NAD83 (2011) horizontal and vertical datum. 2023-08-22T00:00:00 Organization National Geodetic Survey NGS https://ror.org/02f762h70 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ 2 The NOAA Office for Coastal Management (OCM) received files in laz format. The files contained lidar elevation and intensity measurements from Chatham Bay to Monomoy Point, MA. The data were in UTM Zone 19 coordinates and ellipsoid elevations in meters. OCM performed the following processing on the data for Digital Coast storage and provisioning purposes: 1. Converted from UTM Zone 18 to geographic coordinates 2. Sorted by gps time 2023-10-16T00:00:00 Organization Office for Coastal Management OCM https://ror.org/05v14bq57 2234 South Hobson Avenue Charleston SC 29405-2413 https://www.coast.noaa.gov/ 72022 Entity gov.noaa.nmfs.inport:71104 Maryellen Sault 2023-10-13T11:47:45 SysAdmin InPortAdmin 2026-03-04T19:17:27 2023-10-30 National Geodetic Survey NGS 1002 Public No No 2022-04-11 3 Years 2025-04-11