2009 USACE NCMP Topobathy Lidar: Isle Royale, MI

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

coastline of the island of Isle Royale, Michigan in Lake Superior. 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 positions are relative

to NAD83 in decimal degrees of longitude and latitude. The heights were converted from ellipsoid to orthometric heights (NAVD88) using the Geoid03 model

with the results in meters. Once converted to geoid heights, the data were then converted to IGLD85 using the VDatum program from NOAA (National Oceanic

and Atmospheric Administration). The NOAA Office for Coastal Management received the data and converted the hydro files from IGLD85 heights to NAVD88 heights using

VDatum. The heights were then converted to ellipsoid heights using Geoid03. The topo files were converted from NAVD88 heights to ellipsoid heights

using Geoid03. These files were converted for data storage and Digital Coast provisioning purposes.

In addition to these lidar point data, the bare earth Digital Elevation Models (DEM) created from the lidar point data are also available. These data are available for custom download at the link provided in the URL section of this metadata record.

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

along the Michigan 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/geoid18/1391/supplemental/2009_USACE_Great_Lakes_TopoBathy_Lidar_Isle_Royale_Michigan.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=1391

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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.

Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.1850

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 at 1 Sigma

The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than +/- 0.20 m at 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.

The USACE collected, processed, and provided the data to the NOAA Office for Coastal Management (OCM). OCM received the data and processed it to be available for custom download from the Data Access Viewer (DAV) and for bulk download from https.