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

These files contain raster 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. This specific data set consists of 1-Meter pixel size bare earth grids. This data was created from filtered Lidar points to depict bare earth.

In addition to these bare earth Digital Elevation Model (DEM) data, the lidar point data that these DEM data were created from, 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.

Any conclusions drawn from the analysis of this information are not the responsibility of NOAA, the Office for Coastal Management or its partners.

Data is available online for bulk and custom downloads.

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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be aware that temporal changes may have occurred since this data set was collected and some parts of this data may no longer represent actual surface conditions.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.

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000

The data positions were obtained using post processed KGPS methods. The horizontal accuracy of the data is better than +/- 1.5 m RMSE

The data positions were obtained using post processed KGPS methods. The vertical accuracy of the data is better than +/- 0.15 m RMSE

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.