gov.noaa.nmfs.inport:79704 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 2026-06-04T14:23:26 ISO 19115-2 Geographic Information - Metadata Part 2 Extensions for imagery and gridded data ISO 19115-2:2009(E) EPSG::6347 2024 NOAA NGS Topobathy Lidar DEM: Chestertown to Trappe, MD 2026 creation publication NOAA/NMFS/EDM 79704 https://www.fisheries.noaa.gov/inport/item/79704 WWW:LINK-1.0-http--link Full Metadata Record View the complete metadata record on InPort for more information about this dataset. information National Geodetic Survey 1315 East-West Hwy Silver Spring MD 20910 https://geodesy.noaa.gov/ WWW:LINK-1.0-http--link National Geodetic Survey Website Website listed for National Geodetic Survey information originator https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/14162/supplemental/2024_NOAA_Chesapeake_Topobathymetric_Lidar_Report_PM_PLS_Signed.pdf WWW:LINK-1.0-http--link Topobathy Lidar Data Report Topobathy Lidar Data Report download NOAA Chesapeake Topobathymetric Lidar project data were collected by NV5 using Leica Chiroptera/Hawkeye 4X systems. The NOAA Chesapeake Topobathymetric Lidar acquisition was flown between 20241109 and 20241119 in 10 missions. The project buffered boundary extent covers 233,759 acres. LAS files were compiled in 500 m x 500 m tiles. The final classified lidar data were then transformed from ellipsoid (GRS80) to geoidal height NAVD88 (Geoid18) and used to create topobathymetric Cloud Optimized GeoTIFF format digital elevation models (DEMs) in 1m pixel resolution. This NOAA Chesapeake Topobathymetric Lidar dataset represents an area covering 69 - 5000 m x 5000 m DEM tiles. Please note tile 2024_375000e_4310000_dem is fully encompassed within bathymetric void areas and thus has not been provided for this submission. This lidar data was required by National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS), Remote Sensing Division Coastal Mapping Program (CMP) to enable accurate and consistent measurement of the national shoreline. The CMP works to provide a regularly updated and consistent national shoreline to define America's marine territorial limits and manage coastal resources. We request that you credit the National Oceanic and Atmospheric Administration (NOAA) when you use these data in a report, publication, or presentation. 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 custodian notPlanned EARTH SCIENCE > LAND SURFACE > TOPOGRAPHY > TERRAIN ELEVATION > TOPOGRAPHICAL RELIEF MAPS 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 > MARYLAND 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/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]: 2024 NOAA NGS Topobathy Lidar DEM: Chestertown to Trappe, MD [Data Date Range], https://www.fisheries.noaa.gov/inport/item/79704. 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 2024 NOAA NGS Ortho-rectified 4 band Mosaic: Chestertown to Trappe, MD NOAA/NMFS/EDM 79699 crossReference 2024 NOAA NGS Topobathy Lidar: Chestertown to Trappe, MD NOAA/NMFS/EDM 79700 crossReference eng; US elevation OS Independent -76.42 -76.05 38.62 39.24 | Currentness: Ground Condition 2024-11-09 2024-11-19 The NOAA Chesapeake Topobathymetric Lidar data includes all lidar returns. An automated grounding classification algorithm was used to determine bare earth and submerged topography point classification. The automated grounding was followed with manual editing. Classes 2 (ground), 40 (submerged topography), 43 (submerged object), and 46 (submerged aquatic vegetation) were used to create the final DEMs. The full workflow used for this project will be documented in the NOAA Chesapeake Topobathymetric Lidar final report, to be provided upon project completion. ZIP Zip GeoTIFF 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=14163 WWW:LINK-1.0-http--link Customized Download Create custom data files by choosing data area, product type, map projection, file format, datum, etc. download https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/dem/NGS_Chestertown_to_Trappe_MD_2024_14163/index.html WWW:LINK-1.0-http--link Bulk Download Simple download of data files. download dataset Accuracy Horizontal -The project specification requires horizontal positions (RMSEh) to be calculated and reported using the formula provided in Section7.6 and B.8 of the ASPRS Positional Accuracy Standards for Digital Geospatial Data, Edition 2, Version 1.0– August 23, 2023, for the estimation of horizontal accuracy as a function of flying height, Global Navigation Satellite System (GNSS) derived positional error, and INS derived attitude error for given sensor parameters. The obtained RMSEh value is multiplied by a conversion factor of 1.7308 to yield the horizontal(radial) component at the 95% confidence level of the National Standards for Spatial Data Accuracy (NSSDA) reporting standard where a theoretical point will fall within the obtained radius 95 percent of the time (ACCr). Absolute accuracy was assessed using both Non-Vegetated Vertical Accuracy (NVA) and Vegetated Vertical Accuracy (VVA) survey methods. Survey checkpoints were evenly distributed as feasible throughout the project area. Project specifications require the data to be tested and meet The topographic lidar data must be tested to meet ASPRS Positional Accuracy Standards for Digital Geospatial Data, Edition 2 (2023) for a 10(cm) RMSEV Vertical Accuracy Class which require NVA meet 0.196 m accuracy at the 95% confidence interval. NVA compares known ground check point data that were withheld from the calibration and post-processing of the lidar point cloud to the derived gridded bare earth DEM. NVA is a measure of the accuracy of lidar point data in open areas with level slope (less than 20°) where the lidar system has a high probability of measuring the ground surface and is evaluated at the 95% confidence interval (1.96*RMSE). In the NOAA Chesapeake Topobathymetric Lidar project area, 35 survey checkpoints were used to assess the non-vegetated vertical accuracy. Ground check points located in land cover categories other than bare earth or urban were used to compute the Vegetated Vertical Accuracy (VVA). 35 survey checkpoints were used to assess the vegetated vertical accuracy. VVA is contracted to be calculated and reported, but is not used as criteria for acceptance. Please refer to the NOAA Chesapeake Topobathymetric Lidar final data report for final accuracies, to be provided upon project completion. Horizontal Positional Accuracy Based on a flying altitude of 400 meters, an IMU pitch/roll error of 0.002 decimal degrees, an IMU heading error of 0.003 decimal degrees, and a GNSS positional error of 0.005 meters, the RMSEh value for the Leica Chiroptera shallow green and NIR sensor data for the NOAA Chesapeake Topobathymetric Lidar project area is 0.029 meters, with an ACCr of 0.049 meters at the 95% confidence level. The RMSEh value for the Leica Hawkeye deep green sensor data in the NOAA Chesapeake Topobathymetric Lidar project area is 0.034 meters, with a ACCr of 0.059 meters at the 95% confidence level based on a flying altitude of 400 meters, an IMU pitch/roll error of 0.002 decimal degrees, an IMU heading error of 0.004 decimal degrees, and a GNSS positional error of 0.008 meters. Please refer to the NOAA Chesapeake Topobathymetric Lidar project data report for final accuracies, to be provided upon project completion Vertical Positional Accuracy The NOAA Topobathymetric Lidar dataset Non-Vegetated Vertical Accuracy tested 0.056 m vertical accuracy at 95% confidence level against the derived bare earth DEM in open terrain using 35 ground check points, based on RMSEz (0.028 m) x 1.9600. The NOAA Chesapeake Topobathymetric Lidar dataset Vegetated Vertical Accuracy tested 0.226 m vertical accuracy at the 95th percentile against the derived bare earth DEM using 35 landclass points. Please refer to the NOAA Chesapeake Topobathymetric Lidar final data report for final accuracy, to be provided upon project completion. Completeness Measure Data covers the 69 DEM tiles (5000 m x 5000 m tiles). Please note tile 2024_375000e_4310000_dem is fully encompassed within bathymetric void areas and thus has not been provided for this submission. Data for the NOAA Chesapeake Topobathymetric Lidar project area was acquired by NV5 using Leica Chiroptera/Hawkeye 4X topobathymetric lidar systems. All derived DEM data is referenced to: Horizontal Datum-NAD83(2011) epoch: 2010.00 Projection-UTM Zone 18N Horizontal Units-meters Vertical Datum-NAVD88 (Geoid18) Vertical Units-meters NOAA provided NV5 with a project boundary for the NOAA Chesapeake Topobathymetric Lidar project. Using a 100 meter buffered boundary, NV5 created an airborne lidar acquisition plan. The collected lidar data were immediately processed in the field by NV5 to a level that will allow QA\QC measures to determine if the sensor is functioning properly and assess the coverage of submerged topography. An initial SBET was created using Waypoint Inertial Explorer 8.90, and the raw data were extracted into geo-referenced LAS files using Lidar Survey Studio 3.0 with pre-calculated scanner misalignment angles determined through a boresight protocol. These files were inspected for errors and then passed through an automated workflow, producing rasters to develop an initial assessment of bathymetric coverage. NV5 reviewed all acquired flight lines to ensure complete coverage and positional accuracy of the laser points. These rasters were also used to create an initial product - Quick Look Coverage Maps. These Quick Look files are not fully processed data or final products but provide rapid assessment of approximate coverage and depth penetration. 2025-10-21T00:00:00 National Geodetic Survey processor NV5 resolved kinematic corrections for the aircraft Global Navigation Satellite System (GNSS) data using static GPS data from Continuously Operating Reference Stations (CORS) utilizing the Online Positioning User Service (OPUS) for precise positioning. This data was used to correct the continuous on board measurements of the aircraft position recorded throughout the flight. Smoothed best estimate trajectories (SBET) were developed incorporating post-processed aircraft positionings with IMU and when present, gyrostabilized mount data. Using the SBETs, sensor head position and attitude were then calculated throughout the survey. Trimble Business Center v.3.90, Blue Marble Geographic Calculator 2019, and Inertial Explorer v8.9 were used for final SBET creation. 2025-10-21T00:00:00 National Geodetic Survey processor Following final SBET creation, NV5 used Leica's Lidar Survey Studio (LSS) to calculate laser point positioning by associating SBET positions to each laser point return time, scan angle, and intensity. LSS was used to derive a synthetic water surface to create a water surface model for refraction correction. 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 tool corrects for this difference by adjusting the depth (distance traveled) and horizontal positioning (change of angle/direction) of the submerged green laser lidar data. All lidar data below water surface models were classified as water column to correct for refraction. Using raster-based QC methods, the output data is verified to ensure the refraction correction operated properly. 2025-10-21T00:00:00 National Geodetic Survey processor Once all data was refracted by flight line, the lidar data was exported to LAS 1.4 files (point format 6) and delineated into 500 m x 500 m tiles. Data were then further calibrated using StripAlign and TerraMatch. NV5 used custom algorithms in TerraScan to classify the initial ground/bathymetric bottom points. Relative accuracy of overlapping swaths was compared and verified through the use of Delta-Z (DZ) orthos created using NV5's proprietary software Las Product Creator (LPC). Absolute vertical accuracy of the calibrated data was assessed using ground survey data. 2025-10-21T00:00:00 National Geodetic Survey processor Post automated classification, NV5 performed manual reviews and editing to finalize all classification and improve the final topobathymetric surface. NV5's LasMonkey was used to update LAS header information, including all projection and coordinate reference system information. The final lidar data are in LAS format 1.4 and point data record format 6. The final classification scheme is as follows: 1 - unclassified 1 Withheld - edge clip 1 Overlap Withheld - unrefracted green data from Chiroptera sensor 2 - ground 7 Withheld - low noise 18 Withheld - high noise 22 - temporal exclusion 40 - bathymetric bottom or submerged topography 41 - water surface 42 Synthetic- Chiroptera synthetic water surface 43 - submerged feature 45 - water column 46 - Submerged Aquatic Vegetation (SAV) 47 Withheld - submerged noise 48 - submerged temporal exclusion - temporal water column and bathy bottom 2025-10-21T00:00:00 National Geodetic Survey processor NV5 transformed the final lidar data from ellipsoid heights to orthometric heights referenced to NAVD88, Geoid 18 to create the final topobathymetric void clipped DEMs. The topobathymetric bare earth DEMs were output at 1 meter resolution in GeoTIFF format into 69 - 5000 m x 5000 m tiles. The NOAA Chesapeake Topobathymetric Lidar project raster is clipped to the extent of the project boundary and named according to project specifications. A bathymetric void shapefile was created to indicate areas where there was a lack of bathymetric returns. This shape was created by triangulating bathymetric bottom points with an edge length maximum of 4.56 m to identify all areas greater then 9 square meters without bathymetric returns. This shapefile was used to clip and exclude interpolated elevation data from these areas in the bathymetric void clipped topobathymetric bare earth model. In addition to bathymetric voids the void shapefile includes submerged aquatic vegetation shapes that indicate where submerged aquatic vegetation (class 46) was identified and added to the ground model. These shapes were not used to clip the topobathymetric bare earth model, but rather serve as an indicator of where submerged aquatic vegetation is present within the project boundary. 2026-05-15T00:00:00 National Geodetic Survey processor Acquisition and Processing NV5 originator