|2011 USACE/JALBTCX Great Lakes Topographic/Bathymetric Lidar: Michigan (Lake Superior)
and New York (Lakes Erie and Ontario) Coastlines
||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.