2008 USACE Great Lakes Topo/Bathy Lidar: Lake Huron, Michigan

These files contain topographic and bathymetric lidar data collected by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS)

system along the Lake Huron coast of Michigan in Huron, Sanilac, and St. Clair Counties during August 12-17, 2008. CHARTS integrates topographic

and bathymetric lidar sensors, a digital camera, and a hyperspectral scanner on a single remote sensing platform for use in coastal mapping and

charting activities. Data coverage generally extends along the coastline from the waterline inland 500 meters (topography) and offshore 1,000

meters or to laser extinction (bathymetry). The topographic lidar sensor has a pulse repetition rate of 9 kHz at 1064 nm (near-infrared

wavelength). The bathymetric lidar sensor has a pulse repetition rate of 1 kHz at 532 nm (green wavelength). Native lidar data is not generally

in a format accessible to most Geographical Information Systems (GIS). Specialized in-house and commercial software packages are used to process

the native lidar data into 3-dimensional positions that can be imported into GIS software for visualization and further analysis. Horizontal

positions, provided in decimal degrees of latitude and longitude, are referenced to the North American Datum of 1983 (NAD83). Vertical positions

are referenced to the NAD83 ellipsoid and provided in meters. The National Geodetic Survey's (NGS) GEOID03 model is used to transform

the vertical positions from ellipsoid to orthometric heights referenced to the North American Vertical Datum of 1988 (NAVD88). Upon receipt at

the NOAA Office for Coastal Management, the data were converted to las format and to ellipsoid heights using GEOID03 for data storage and Digital Coast

provisioning purposes. Additionally, the bathymetric lidar data points were classified according to the ASPRS LAS 1.2 classification scheme as

11 (bathymetry) and the topographic last return lidar data points were classified as 1 (unclassified).

Original contact information:

Contact Org: JALBTCX

Title: Data Production Manager

Phone: 228-252-1111

Email: shoals-info@sam.usace.army.mil

These data were collected as a part of the NCMP (National Coastal Mapping Program) to depict the elevations ABOVE AND/OR BELOW the water

for the First Return OR Last Return OR Hydro in the Michigan coastal zone.

10715

Sensor malfunction in the survey area hindered the acquisition of bathymetric data in boxes 08, 09, 10, and 11 which and resulted in

incomplete coverage.

A footprint of this data set may be viewed in Google Earth at:

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/587/supplemental/2008_USACE_Great_Lakes_TopoBathy_Lidar_Michigan_Lake_Huron.kmz

Any conclusions drawn from the analysis of this information are not the responsibility of JALBTCX, the

Office for Coastal Management or its partners.

This data can be obtained on-line at the following URL: https://coast.noaa.gov/dataviewer;

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.

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 1; ESRI ArcCatalog 9.3.1.1850

These data are not attributed. | Quantitative Value: N/A | Quantitative Test Explanation: These data are not attributed.

The data positions were obtained using post processed KGPS methods. The horizontal accuracy of the data is better than +/- 0.75 m.; Quantitative Value: 0.75 meters, Test that produced the value: 1 Sigma

The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than +/- 0.20 m.; Quantitative Value: 0.20 meters, Test that produced the value: 1 Sigma

Cloud Cover: Unknown

Not provided

The data provided in this file were tested against ground truth data. At these locations the lidar data matched within 0.20 meters, and

different flight line data agreed within 0.20 meters.