2021 NOAA Bathymetric Lidar DEM: Sleeping Bear Dunes National Lakeshore, MI

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Bulk download of data files in GeoTiff format, UTM Zone 16N NAD83(2011) coordinates in meters, and NAVD88 (Geoid18) elevations in meters.

Lidar survey report detailing the data acquisition, processing, and quality control information.

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.

This graphic displays the footprint for this lidar data set.

Link to custom download, from the Data Access Viewer (DAV), the lidar point data from which these raster Digital Elevation Model (DEM) data were created.

All lidar data were acquired using a Leica HawkEye4X topographic and bathymetric lidar system. The main sensor head, which contains the topographic laser, shallow bathymetric laser and RCD30 camera, was mounted in a Leica PAV100 gyro-stabilized mount integrated with a NovAtel SPAN GNSS and LCI-100C IMU. The deep channel bathymetric sensor head was installed using a separate fixed mount, with its own LCI-100C IMU. Real time navigation and GNSS/IMU data logging was provided by Leica FlightPro software. Lidar data were logged on the Airborne Hydrography, AB (AHAB) operator console. The HE4X provided 300 kHz topographic data, 140 kHz shallow bathymetric data and 40 kHz deep bathymetric data. 4-band 80 MP digital camera imagery was also collected simultaneously with the sensor's RCD-30 camera to assist with editing. Trajectory data were post-processed using NovAtel Inertial Explorer software to provide a tightly coupled precise point position (PPP) and orientation solution. Lidar data were processed in Leica's Lidar Survey Studio (LSS) using calibration data and final processed trajectory information to create an accurately georeferenced lidar point cloud for the entire survey in LAS v1.4 format. All points from the topographic and bathymetric laser include 16-bit intensity values. LAS files from LSS were imported to a Terrascan project where spatial algorithms were used to remove noise and classify bare earth/ground. Manual review was conducted in Terrascan prior to product creation. Woolpert used proprietary in-house scripts to compute project specific correction parameters and normalize the raw bathymetric intensity data for depth. This provides intensities that more closely represent the reflectance of the actual seabed. Corrected values are included in the provided LAS files. During lidar processing any line to line vertical mismatches are removed. Due to the lack of ground control in the survey area, a lidar QC flightline was acquired over the same area for every flight. This line covered ground control on land, out to full bathymetric depth. This line was used to test for accuracy. Interswath or overlap consistency for the topographic laser was assessed in all areas of overlap with slopes of less than 10 degrees. The topographic RMSDz for the project lines is 0.022 m. Interswath or overlap consistency for the bathymetric laser was assessed in all areas of overlap with slopes of less than 10 degrees. The bathymetric RMSDz for the project lines is 0.064 m. All data are provided in NAD83(2011) Epoch 2010.0. All units in meters. All lidar data was transformed to the NAVD88 vertical datum using GEOID18. Delivered LAS Classes include: 1-Unclassified, 2-Ground, W7-Low Point(Noise), 9-Water Surface Topo, W18-High Noise, 40-Bathymetric Point, 41-Water Surface Bathy, S42-Derived Water Surface, 43-Submerged Object, W45-No Bottom Found At. One charted wreck was found during data editing. The approximate location of this wreck is 45 degrees 02'21.6"N, 85 degrees 59'6.5"W and is captured in the anomalies shapefile included with the project deliverables.

The NOAA Office for Coastal Management (OCM) received 629 Geotiff files from Woolpert for the Sleeping Bare Dunes project area in Michigan. The bare earth raster files were at a 2 m grid spacing. The data were in UTM Zone 16N NAD83(2011), meters coordinates and NAVD88 (Geoid18) elevations in meters. OCM assigned the appropriate EPSG codes (Horiz - 6345, Vert - 5703) and copied the raster files to https for Digital Coast storage and provisioning purposes.