2010 USACE NCMP Topobathy Lidar: Gulf Coast (AL, FL)

These files contain topographic and bathymetric lidar data collected by the HawkEye system along the coast of Alabama and the gulf coast

of Florida. The data were collected January - March 2010. The area of coverage includes the coastline in Baldwin and Mobile Counties

in Alabama and the following Florida counties: Bay, Escambia, Franklin, Gulf, Okaloosa, Santa Rosa, and Walton.

HawkEye integrates topographic and bathymetric lidar sensors with a digital camera on a single remote sensing platform for use in

coastal mapping and charting activities. The topographic lidar sensor has a pulse repetition rate of 64 kHZ at 1064 nm (red wavelength).

The bathymetric lidar sensor has a pulse repetition rate of 4 kHz at 532 nm (green wavelength). Native lidar data is not generally in a

format accessible to most GIS systems. Specialized in-house and commercial software packages are used to process the native lidar data

into 3-D positions that can be imported into GIS software for visualization and further analysis.

The data were provided to NOAA OCM in decimal degrees of latitude and longitude, referenced to the NAD83 ellipsoid and 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 file was LAS version 1.0. For data storage and Digital

Coast provisioning purposes, NOAA OCM converted the orthometric heights (NAVD88) back to ellipsoidal heights using GEOID03.

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 Gulf of Mexico - Alabama and Florida project to depict the elevations above and below the

water for the First Return, Last Return, and Hydro in the Alabama and Florida 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/geoid18/1064/supplemental/2010_USACE_JALBTCX_Alabama_Florida_Topobathy_Lidar.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;

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 XP Professional x64 Edition, Version 2003, Service Pack 2, ESRI ArcCatalog 9.2.6.1770

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 +/- 1.5 m (RMSE); Quantitative Value: 1.5 meters, Test that produced the value: Not provided

The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than +/- 0.15 m (RMSE); Quantitative Value: 0.15 meters, Test that produced the value: Not provided

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.