2011 USACE/JALBTCX Great Lakes Topographic/Bathymetric Lidar: Michigan (Lake Superior)
and New York (Lakes Erie and Ontario) Coastlines
This kmz file shows the extent of coverage for the 2011 USACE New York/Michigan Great
Lakes lidar data set.
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.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
Lidar Dataset Supplemental Information
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||These data were collected as a part of the NCMP to depict the elevations above and
below the water in the Michigan and New York Great Lakes coastal zones.
||2011-06-06 to 2011-09-23
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- U.S. Army Corps of Engineers (USACE)
- Mobile District
- National Coastal Mapping Program (NCMP)
- Classified LAS
- Scanning Hydrographic Operational Airborne Lidar System (SHOALS)
- Compact Hydrographic Airborne Rapid Total Survey (CHARTS)
- Joint Airborne Lidar Bathymetry Technical Center of eXpertise (JALBTCX)
- New York
- Jefferson County
- Oswego County
- Cayuga County
- Wayne County
- Monroe County
- Orleans County
- Niagra County
- Erie County
- Houghton County
- Marquette County
- Alger County
- Lake Superior
- Lake Erie
- Lake Ontario
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
| 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
10 kHz, bathymetric lidar data at 1 kHz and RGB imagery at 1Hz. 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 charts2las module then
converts all valid data from ellipsoid to orthometric heights based on the NGS' GEOID03
model and exports topographic and bathymetric data as a series of LAS files, one file
per flight line. The format of the file is LAS version 1.2. Data are classified as
0 (valid topographic data), 21 (valid topographic data acquired with the bathymetric
sensor), 27 (invalid topographic and bathymetric data), 29 (valid bathymetric data).
The data are then shifted vertically to the International Great Lakes Datum of 1985
(IGLD85) using the VDatum program from NOAA (National Oceanic and Atmospheric Administration).
- The flightline LAS files are imported into GeoCue V188.8.131.52, which is a geospatial
workflow production and management software tool employed by JALBTCX to perform and
monitor production of data products. Upon import into GeoCue, the flightline LAS files
are divided into a series of boxes, each of which are 1500 meters in length and width.
A customized classification macro, built upon the TerraScan V11 module within Microstation
V8i, classifies valid topographic data as ground points (2) and unclassified points
(1). Upon completion the macro, the classification results undergo quality control
and any misclassified points are manually edited. In areas of dense vegetation the
bare earth ground points might be incorrectly classified due to the inability of the
laser to penetrate the canopy and reach the bare ground. In these areas, JALBTCX defaults
to the algorithms ground surface instead of manually reclassifying those points. The
final classification results are comprised of individual lidar points with classification
s of ground (2) or unclassified (1). They are partitioned into a series of 5km delivery
boxes, one Classified LAS file per box. The format of the file is LAS version 1.2.
Data are classified as 1 (valid non-ground topographic data), 2 (valid ground topographic
data), 21 (valid topographic data acquired with the bathymetric sensor), 27 (invalid
topographic and bathymetric data), 29 (valid bathymetric data).
- The NOAA Coastal Services Center (CSC) received classified topographic files in LAS
format. The files contained lidar elevation measurements. The data were received in
North American Datum 1983 (NAD83) geographic coordinates and were vertically referenced
to NAVD88 using the Geoid09 model. The vertical units of the data were meters. CSC
performed the following processing for data storage and Digital Coast provisioning
purposes: 1. The topographic las files were converted from orthometric (NAVD88) heights
to GRS80 ellipsoidal heights using Geoid09. 2. Points in class 29 (valid bathymetric
data) were reclassified to class 11 (valid bathymetric data) using las2las software.
3. The data were converted to LAZ format.
- 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
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
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
the ellipsoid (either GRS80 or ITRF94), allowing for the ability to apply the most
up to date geoid model when transforming to orthometric heights.
Metadata Last Modified: 2013-01-22
For questions about the information on this page, please email: