2009 US Army Corps of Engineers (USACE) Joint Airborne Lidar Bathymetry Technical Center of Expertise (JALBTCX) Topobathy Lidar: Apostle Islands, WI

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

of Wisconsin. 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

were referenced to the NAD83 ellipsoid and provided in meters. The National Geodetic Survey's (NGS) GEOID03 model was used to transform the vertical positions

from ellipsoid to orthometric heights referenced to the North American Vertical Datum of 1988 (NAVD88). The format of the files was LAS version 1.0.

The NOAA Office for Coastal Management received the data and converted the topo and hydro files from NAVD88 heights to ellipsoid heights using GEOID03.

These files were converted for data storage and Digital Coast provisioning purposes. The data are classified as:

1 - Unclassified

2 - Ground

11 - Bathymetry

Original contact information:

Contact Org: JALBTCX

Title: Data Production Manager

Phone: 228-252-1121

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

These data were collected as a part of the National Coastal Mapping Program (NCMP) to depict the elevations above and below the water line in the Wisconsin

coastal zone.

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

https://noaa-nos-coastal-lidar-pds.s3.amazonaws.com/laz/geoid18/1392/supplemental/2009_USACE_Great_Lakes_TopoBathy_Lidar_Apostle_Islands_Wisconsin.kmz

Any conclusions drawn from the analysis of this information are not the responsibility of USACE, 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/#/lidar/search/where:ID=1392

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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. These data depict the heights at the time of the survey and are only accurate for that time.

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 plus or minus 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 plus or minus 0.20 m.

; Quantitative Value: 0.20 meters, Test that produced the value: 1 Sigma

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.