gov.noaa.nmfs.inport:51272 eng UTF8 dataset Elevation National Geodetic Survey 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 2026-03-04T19:17:25 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) 2016 NOAA NGS Topobathy Lidar: Marthas Vineyard and Nantucket Islands, MA 2018-02-14 publication NOAA/NMFS/EDM 51272 https://www.fisheries.noaa.gov/inport/item/51272 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information NGS Communications and Outreach Branch (301) 713-3242 (301) 713-4172 ngs.infocenter@noaa.gov originator https://coast.noaa.gov/dataviewer WWW:LINK-1.0-http--link Citation URL Data Access Viewer for discovering coastal imagery, land cover, and elevation data download https://coast.noaa.gov WWW:LINK-1.0-http--link Citation URL Web page for the NOAA Office for Coastal Management download https://coast.noaa.gov/dataregistry WWW:LINK-1.0-http--link Citation URL Web page to the Digital Coast for finding coastal data download These data were collected by Leading Edge Geomatics using a Leica Chiroptera II Bathymetric/Topographic Sensor. The data were acquired from October 4, 2016 through November 1, 2016. The data includes topobathy data in LAS 1.2 format classified as created, never classified (0); Unclassified (1); Ground (2); Topo Noise (7); Water (9); Refracted Bathymetric Noise (22); Water Column (25); Bathymetric Bottom or Submerged Topography (26); Water Surface (27); Derived Water Surface (28). The project area covers Marthas Vineyard and Nantucket Islands along with some shoal areas surrounding the islands. The project covers a total of 234 square miles within the AOI. This dataset contains 7030 - 500 m x 500 m lidar tiles. The Martha's Vineyard and Nantucket Islands have been identified as having critical topographic and bathymetric data gaps by NOAA. This lidar data will fill those critical gaps. NOAA National Geodetic Survey (NGS). 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 > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > BATHYMETRY EARTH SCIENCE > OCEANS > BATHYMETRY/SEAFLOOR TOPOGRAPHY > SEAFLOOR TOPOGRAPHY EARTH SCIENCE > OCEANS > COASTAL PROCESSES > COASTAL ELEVATION theme Global Change Master Directory (GCMD) Science Keywords 17.0 CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > MASSACHUSETTS place Global Change Master Directory (GCMD) Location Keywords 20.8 20161004 20161005 20161006 20161007 20161008 20161015 20161016 20161017 20161018 20161019 20161020 20161025 20161026 20161027 20161028 20161029 20161101 temporal DOC/NOAA/NOS/NGS > National Geodetic Survey, National Ocean Service, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2017-04-24 publication 8.5 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian NGS Lidar project InPort otherRestrictions Cite As: National Geodetic Survey, [Date of Access]: 2016 NOAA NGS Topobathy Lidar: Marthas Vineyard and Nantucket Islands, MA [Data Date Range], https://www.fisheries.noaa.gov/inport/item/51272. 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 National Geodetic Survey, the Office for Coastal Management, or its partners. unclassified NOAA Data Management Plan (DMP) NOAA/NMFS/EDM 51272 https://www.fisheries.noaa.gov/inportserve/waf/noaa/nos/ngs/dmp/pdf/51272.pdf WWW:LINK-1.0-http--link NOAA Data Management Plan (DMP) NOAA Data Management Plan for this record on InPort. information crossReference eng; US elevation -70.869328 -69.9375 41.225857 41.515799 | Currentness: Ground Condition 2016-10-04 2016-11-01 Data for Marthas Vineyard and Nantucket Islands project was acquired by Leading Edge Geomatics using a Leica Chiroptera II Bathymetric and Topographic lidar sensor. The full workflow used for this project is found in the final project report submitted to NOAA. Users should be advised that there is a potential that some ground and bathymetry points may have been misclassified. false eng false Other NOAA NGS Topobathy Lidar Class Scheme: Marthas Vineyard and Nantucket Islands, MA 2024-02-01 publication Zip Zip LAS/LAZ - LASer Zip KML/KMZ - Keyhole Markup Language Zip 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=8460 WWW:LINK-1.0-http--link https://coast.noaa.gov/dataviewer/#/lidar/search/where:ID=8460 Link to custom download download https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8460/index.html WWW:LINK-1.0-http--link https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8460/index.html Link to bulk LAZ files download https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8460/supplemental/ma2016_ngs_topobathy_mvineyard_nantucket_m8460.kmz WWW:LINK-1.0-http--link https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/8460/supplemental/ma2016_ngs_topobathy_mvineyard_nantucket_m8460.kmz This graphic illustrates the lidar footprint. download dataset Horizontal Positional Accuracy The horizontal accuracy of the data is better than plus or minus 1.0 m at a 95% confidence level. Vertical Positional Accuracy The actual NVA accuracy was found to be RMSEz= 8.6 cm, equating to +/- 16.9 cm at 95% confidence level. The actual VVA accuracy was found to be +/- 26.8 cm at the 95th percentile. Quantitation Limits Lidar vendors calibrate their lidar systems during installation of the system and then again for every project acquired. Typical calibrations include cross flights that capture features from multiple directions that allow adjustments to be performed so that the captured features are consistent between all swaths and cross flights from all directions. Horizontal positional accuracy is achieved through rigorous processing of airborne GPS and IMU, use of control, and calibration procedures. No photo-identifiable areas could be found in the lidar intensity imagery and horizontal accuracy could not be tested for the lidar data. The vertical accuracy of the lidar was tested by Dewberry with 48 independent survey checkpoints. The survey checkpoints are evenly distributed throughout the project area and are located in areas of non-vegetated terrain, including bare earth, open terrain, and urban terrain (26), vegetated terrain, including forest, brush, tall weeds, crops, and high grass (11), and submerged bottom areas (11). The vertical accuracy is tested by comparing survey checkpoints to a triangulated irregular network (TIN) that is created from the lidar ground and submerged bottom points. Checkpoints are always compared to interpolated surfaces created from the lidar point cloud because it is unlikely that a survey checkpoint will be located at the location of a discrete lidar point. All checkpoints located in non-vegetated terrain were used to compute the Non-vegetated Vertical Accuracy (NVA). Project specifications required a NVA of 19.6 cm at the 95% confidence level based on RMSEz (10 cm) x 1.9600. All checkpoints located in vegetated terrain were used to compute the Vegetated Vertical Accuracy (VVA). Project specifications required a VVA of 30.0 cm based on the 95th percentile. All checkpoints located in bathymetric areas were used to compute an accuracy for the bathymetric data. Project specifications required bathymetric data to meet or exceed 58.8 cm at the 95% confidence level based on RMSEz (18.5 cm) x 1.9600. Data for Marthas Vineyard and Nantucket Islands project was acquired by Leading Edge Geomatics using a Leica Chiroptera II Bathymetric and Topographic lidar sensor. All delivered lidar data is referenced to: Horizontal Datum-NAD83 (2011) epoch: 2010 Projection-UTM Zone 19 North Horizontal Units-meters Vertical Datum-NAD83 Vertical Units-meters This dataset encompasses 7,030 500m x 500m tiles. Both green lidar data and NIR lidar data was acquired. Leading Edge Geomatics acquired, calibrated and performed the refraction correction to the lidar data. Dewberry received the calibrated green and NIR data and verified complete coverage. Relative accuracy of the green swaths compared to overlapping and adjacent green swaths as well as the relative accuracy of green swaths compared to overlapping and adjacent NIR swaths was verified through the use of Delta-Z (DZ) orthos created in GeoCue software. Intraswath or within a swath relative accuracy was verified using Quick Terrain Modeler. Profiles of elevated planar features, such as roofs, were used to verify horizontal alignment between overlapping swaths. Dewberry then verified absolute vertical accuracy of the swath data prior to full-scale production. Dewberry used ArcGIS to create 2-D breaklines. The bathymetric points exported by the Leica processing software were aggregated into polygons. These 2D breaklines representing the bathy areas were manually reviewed and adjusted where necessary to ensure all well-defined hydrographic features (at 1:1200-scale) were captured with breaklines. Dewberry used algorithms in TerraScan to create the initial ground/submerged topography surface. Dewberry used the 2-D breaklines to classify the bathymetric bottom and ground points properly in TerraScan. All lidar data was peer-reviewed. Dewberry's QAQC also included creating void polygons for use during review. All necessary edits were applied to the dataset. GeoCue software was used to update LAS header information, including all projection and coordinate reference system information. The final lidar data are in LAS format 1.2 and point data record format 3. The final classification scheme is as follows: 1-Unclassified 2-Ground 7-Topo Noise 9-Water 22-Refracted Bathymetric Noise 25-Water Column 26-Bathymetric Bottom or Submerged Topography 27-Water Surface 28-Derived Water Surface All data is then verified by an Independent QC department within Dewberry. The independent QC is performed by separate analysts who do not perform manual classification or editing. The independent QC involves quantitative and qualitative reviews. 2017-01-01T00:00:00 National Geodetic Survey processor The NOAA Office for Coastal Management (OCM) received files in las format. The files contained lidar elevation and intensity measurements of Marthas Vineyard and Nantucket. The data were in UTM Zone 19 coordinates and ellipsoid elevations in meters. The data classifications for the data are: 1 - unclassified, 2 - ground, 7 - topo noise, 26 - bathymetric bottom or submerged topography, 27 - water surface, 2. OCM performed the following processing on the data for Digital Coast storage and provisioning purposes: 1. Converted from UTM Zone 19 to geographic coordinates 2. Sorted by gps time 3. Compressed the data using laszip 2017-02-01T00:00:00 Office for Coastal Management processor Lidar