2009 Bayfield County Lake Superior Lidar Survey
This kmz file shows the extent of coverage for the 2009 Bayfield County, WI Lake Superior
lidar data set.
The LIDAR survey presents digital elevation data sets of a bald earth surface model
and 2ft interval contours covering Bayfield County, Wisconsin. The LIDAR data was
acquired in March of 2009 using an Optech ALTM 3100EA LIDAR system. The spatial coordinate
system is Wisconsin State Plane Bayfield North (4801) in meters, NAVD88 in meters,
using the Geoid03 model.
Cite this dataset when used as a source.
|Search and Download
|| Distributor information not available
| Point of Contact
Bayfield County Land Records Department
Documentation links not available.
- Bayfield County Land Records Department
- Wisconsin Coastal Management Program
|Data Presentation Form:
|| Digital image
|Dataset Progress Status
|Data Update Frequency:
|| As needed
||The LIDAR surface models and contours depicts geographic features on the earth's surface
and is intended for reference within a Geographic Information System environment.
|| Unknown to Unknown
|Spatial Reference System:
|Spatial Bounding Box Coordinates:
|Spatial Coverage Map:
- United States
- Bayfield County
- Douglas County
- Ashland County
- Iron County
- Lake Superior
| Use Constraints
|| No constraint information available
|| Fee information not available.
|| Lineage statement not available.
- Laser Mapping Specialists, Inc
| Processing Steps
- The production of LIDAR bald earth DEM's and contours requires a LIDAR survey, LIDAR
sensor calibration, data processing, ground control and ortho-rectified images. An
Optech ALTM 3100EA LIDAR system was used flying at 4000ft agl with a 21deg scan angle
and 40% sidelap for an avg raw point density of 2.6ft.
- The NOAA Coastal Services Center (CSC) received topographic LAS files with no metadata.
The files contained LiDAR elevation and intensity measurements. The points were classified
as 'never classified' or unclassified. The data arrived in Wisconsin State Plane Bayfield
North (4801) and in NAVD88 in feet. The following processing steps were performed
by CSC: 1. A ground classification algorithm was applied to the data to classify 'bare
earth' points. 2. The data were converted from NAVD88 orthometric elevations to ellipsoidal
(GRS80) elevations using Geoid 03. 3. The data were transformed from projected State
Plane (WI North) to Geographic coordinates (NAD83). 4. The data were merged into one
large LAS file then retiled. 5. The data were converted to LAZ format. 6. Metadata
for the lidar collection was created.
- 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: 2013-10-31
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