| 2007 US Army Corps of Engineers (USACE) National Coastal Mapping Topobathy Lidar (Bare
Earth) - New York (Lake Erie shoreline) |
| This is a bare earth data set. The data contained in these files contain hydrographic
and topographic data collected by the CHARTS system along the Lake Erie coast of NY
in Chautauqua and Erie Counties, from July 26 - August 4, 2007. The data were collected
and processed in geographic coordinates and ellipsoid heights. The positions were
relative to NAD83 in decimal degrees of longitude and latitude. The heights were converted
from ellipsoid to orthometric heights (NAVD88) using the Geoid03 model with the results
in meters. CHARTS integrates topographic and bathymetric lidar sensors, a digital
camera and a hyperspectral scanner 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). The topographic lidar sensor has a pulse repetition
rate of 9 kHz at 1064 nm (near-infrared wavelength). The bathymetric lidar sensor
has a pulse repetition rate of 1 kHz at 532 nm (green wavelength). Native lidar data
is not generally in a format accessible to most Geographical 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.
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