2009 USACE Great Lakes Topo/Bathy Lidar: Minnesota
This kmz file shows the extent of coverage for the 2009 USACE Great Lakes Minnesota
topo-bathy lidar data set.
These files contain bare-earth classified topographic and bathymetric lidar data collected
July 27, 2009 by the Compact Hydrographic Airborne Rapid Total Survey (CHARTS) system
along the coast of Lake Superior near Duluth, Minnesota. 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 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 ellipsoid and provided in 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). For data storage
and provisioning purposes, the NOAA Coastal Services Center converted the data from
NAVD88 heights to ellipsoid heights using GEOID03.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
Documentation links not available.
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||High water turbidity in the survey area hindered the acquisition of bathymetric data
in box 01 and resulted in incomplete coverage.
||These data were collected as a part of the National Coastal Mapping Program (NCMP)
to depict the elevations above the water in the Minnesota coastal zone.
||2009-07-27 to 2009-07-27
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- U.S. Army Corps of Engineers, Mobile District
- United States
- Saint Louis County
- Lake Superior
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| Processing Steps
- These data were collected using the CHARTS system. It is owned by the Naval Oceanographic
Office and operated through contract. The system collects topographic lidar data at
9 kHz, bathymetric lidar data at 1 kHz and RGB imagery at 1 Hz. A CASI-1500 hyperspectral
line scanner is integrated with the system as well. Aircraft position, velocity and
acceleration information are collected through a combination of Novatel and POS A/V
410 equipment. All raw data streams are transferred to the office for downloading
and processing in SHOALS GCS software. Aircraft position data are processed using
POSPac software and the results are combined with the lidar data to produce 3-D positions
for each lidar shot. Upon inspection and QA/QC in the software packages Fledermaus
and PFM_ABE, anomalous data are flagged as invalid. PFM_ABE's chartsLAS module then
converts all valid data from ellipsoid to orthometric heights based on the NGS' GEOID03
model and exports topographic data as a series of LAS files with a single file per
flightline per 5 km box.
- The NOAA Coastal Services Center (CSC) received unclassified files in las format.
The files contained LiDAR intensity and elevation measurements. CSC performed the
following processing on the data for data storage and Digital Coast provisioning:
1. The data were bare-earth classified using MARS Explorer 6.1 software. 2. The data
were converted from NAVD88 heights to ellipsoid heights using Geoid03. 3. The LAS
header fields were sorted by latitude and updated. 4. The data were converted to LAZ
- The NOAA National Geophysical Data Center (NGDC) received lidar data files via ftp
transfer from the NOAA Coastal Services Center. The data are
currently being served via NOAA CSC Digital Coast at http://www.csc.noaa.gov/digitalcoast/.
The data can be used to re-populate the system. The data are archived in LAS
or LAZ format. The LAS format is an industry standard for LiDAR data developed by
the American Society of Photogrammetry and Remote Sensing (ASPRS); LAZ is a loseless
compressed version of LAS developed by Martin Isenburg (http://www.laszip.org/). The
data are exclusively in geographic coordinates (either NAD83 or ITRF94). The data
are referenced vertically to the ellipsoid (either GRS80 or ITRF94), allowing for
the ability to apply the most up to date geoid model when transforming to orthometric
Metadata Last Modified: 2013-06-04
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