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2011 U.S. Army Corps of Engineers (USACE) Topographic LiDAR: Alabama, Mississippi and Louisiana
browse graphic These files contain classified topographic and bathymetric lidar data as unclassified valid topographic data (1), valid topographic data classified as ground (2), Invalid topographic data classified as lowpoints (7), validtopographic data acquired with the bathymetric sensor (14), invalid topographic and bathymetric data (17). Classes 1 and 2 are defined in accordance with the American Society for Photogrammetryand Remote Sensing (ASPRS) classification standards, while classes 14 and 17 are classes specific to NOAA CSC. These data were collected by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) systemalong the coast of Mississippi. CHARTS integrates topographic and bathymetric lidar sensors, a digital camera and a hyperspectral imager 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). Native lidar data is not generally in a format accessible tomost Geographic 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 visualizationand 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 providedin 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). The 3-D positiondata are sub-divided into a series of LAS files, each covering approximately 5 kilometers of shoreline. The format of the file is LAS version 1.2. Data for Louisiana was collected on May 31st, 2011. Data for Alabama was collectedfrom June 2nd, 2011 to June 4th, 2011. Data for Mississippi was collected from June 1st, 2011 to June 3rd, 2011.