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2011 USACE/JALBTCX Great Lakes Topographic/Bathymetric Lidar: Michigan (Lake Superior) and New York (Lakes Erie and Ontario) Coastlines
browse graphic These files contain classified topographic and bathymetric lidar data as unclassified valid topographic data (1), valid topographic data classified as ground (2), low points or noise (7), valid bathymetric data (11). Classes 1, 2 and 7 are defined in accordance with the American Society for Photogrammetry and Remote Sensing (ASPRS) classification standards, while class 11 is specific to the NOAA CSC. These data were collected by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) system along the coast of Michigan and New York. 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 to most 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 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 are referenced to the NAD83 (GRS80) ellipsoid and provided in meters.The 3-D position data are sub-divided into a series of LAS files, each covering approximately 5 kilometers of shoreline. LiDAR data was collected at a nominal point spacing (NPS) of 2.0 meters. The format of the file is LAS version 1.2.