2010 Great Lakes Restoration Initiative Bathymetric Lidar: Lake Superior
This kmz file shows the extent of coverage for the 2010 GLRI Lake Superior bathymetric
lidar data set.
The data contained in this file contain hydrographic and topographic data collected
by the Fugro LADS Mk II system along the Lake Superior coast of Minnessota, Wisconsin
and Michigan. FLI was contracted under Fugro Earth Data Inc (FEDI) by NOAA Coastal
Services Center (CSC) to collect data under the Great Lakes Restoration Initiative.
All point data has delivered is in LAS 1.2 format The file has been classified so
that all points are classified as first return or bare earth First return points include
all vegetation, buildings or other feature with fixed position Bare earth points exclude
vegetation, buildings, piers, jetties, nav aids, bridges and any other fixed man made
feature. Except for break waters and retaining walls along the shore line.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
Lidar Survey Collection Report
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||Data extends off shore from the shoreline to extinction depth or 1km, which ever is
closer. Data extends onshore from the shoreline to 30m. Gaps in Bathymetry can be
attributed to turbid water, glassy lake surfaces, boats, extinction depths Gaps in
bathymetry were reflown multiple times to attempt full bottom coverage. Gaps in Topography
occur where data collected was rejected due to significant datum errors after long
sections of over land. These areas were attempted multiple times.
||This data was collected as part of the Great Lakes Restoration Initiative (GLRI),
an inter-agency initiative lead by the Environmental Protection Agency (EPA) targeting
areas with the most significant problems in the Great Lakes region.
||2010-07-02 to 2010-08-12
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- LADS Mk II
- digital elevation model
- Great Lakes
- Lake Superior
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
- Fugro LADS Inc.
- Fugro Earth Data Inc.
- DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
| Processing Steps
- This data was collected using the LADS Mk II bathymetric Lidar survey system. It is
owned by Fugro LADS Corp. and was operated by Fugro LADS, Inc. The system collects
bathymetric/topographic data at 1kHz. The system also collects digital imagery at
1Hz. Aircraft position information is collected with Wide Area Differential (WADGPS)
through Omistar and is logged with GrafNav. The LADS Mk II system operated on a stabalised
platform. Raw data are copied from the LADS Air System (AS) to the LADS Ground System
(GS) where post processed GPS is applied as the raw data is processed, producing a
3-D position for each waveform in the dataset. The data was reduced with the use of
water level information downloaded from NOAA COOPS website to vertical datum IGLB85
minus a constant 183.2 meters (the LADS ground system allows tidal corrections less
than +/- 100 meters due to usual operation in areas closer to mean sea level). 183.2
meters was added back to each sounding as data was exported out of the LADS Ground
System to reference it to IDLG85. Data was then shifted by a constant 0.03m to reference
the dataset to NAVD88. Fugro Earth Data Inc. then completed the final trasformation
to the NAD83 datum. First return and bare earth data sets were exported as LAS 1.2
format files and delivered to Fugro Earth Data Inc. for classification.
- Both LAS files were merged, if the same data point existed in both data sets then
it was assigned a bare earth classification in the first return data set; If a point
existed in the first return dataset and not in the bare earth data set it was assigned
a first return classification in the first return LAS data set. To maintain header
information the single classified LAS file was then imported into ProjMap for transformation
from IGLD85 to GRS80 heights. As ProjMap does not recognize IGLD85 an assumption was
made that IGLD85 heights and NAVD88 heights are the same with an error of +/-0.01m.
This was determined by transforming a sample of points across the data set with a
height value of 183.2m (lake surface) and converting them to NAVD88 with NOAA's VDatum.
The average difference across the sample set was < 1cm. GeoCoding in GeoCue was ran
to assign the correct header information to the file. The classified LAS 1.2 format
file was delivered back to Fugro LADS Inc.
- The NOAA Coastal Services Center (CSC) received files in LAS format. The files contained
bathymetric Lidar depth measurements. CSC performed the following processing on the
data for data storage purposes and Digital Coast provisioning: 1. The data were converted
from projected UTM (NAD83, Zone 15 & 16) coordinates to geographic (NAD83) coordinates
2. The data were converted from NAVD88 heights to ellipsoid heights using Geoid09
3. The LAS header fields were sorted by latitude and updated
- 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: 2013-05-09
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