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Information Management
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"Data collection and existing criteria substantiation
will make up a major initial step in the study process."
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How do water levels in Lake Ontario and the St.
Lawrence River relate to Information Management Needs interests?
Why was the Information Management Needs Technical
Working Group (TWG) created?
What are the Group’s goals for the Study?
How will the Group achieve these goals?
How do water levels relate to Information
Management interests?
An important feature of water level fluctuations along the
Lake Ontario – St. Lawrence River system is the change in
water depth and flows. The Plan
of Study (PDF document) identified that:
- High resolution topographic and bathymetric mapping in
the near shore are needed to provide the requisite information
for modeling flooding, erosion and low water level impacts
- Detailed elevation data are needed to assess the impacts
of various water level scenarios on wetland health and sustainability
with emphasis on the relationships between topography, water
circulation, plant communities, and key habitats.
- Accurate elevation data are also required to assess water
level impacts on private and public shore properties, municipal
water intakes and outflows, recreational boating facilities,
and public bathing beaches.
Why was the Information Management Technical
Working Group (TWG) created?
- To complete topographic and bathymetric mapping and other
imagery requirements along the shores of Lake Ontario and
the St. Lawrence River.
- To address issues related to the use of Geographic Information
Systems (GIS) and data/information management
- To work towards an information management strategy to
facilitate the sharing, access and use of all data and information
generated within the study.
What are the Group’s goals for the Study?
- To collect bathymetric and topographic data for identified
priority zones of the shoreline.
- To acquire aerial photography and other imagery for specified
areas of the shoreline.
- To develop shoreline digital elevation models (DEMs) with
the topographic and bathymetric data.
- To develop GIS guidelines for the use of geo-spatial data
within the Study.
- To develop an information management strategy that addresses
all issues related to the sharing, storage, use and distribution
of data and information generated as a result of this study.
How will the Group achieve these goals?
Recent technology advances in airborne laser mapping systems
provide unprecedented potential for the mapping of coastal
topography and bathymetry using airborne LIDAR (Light
Detection and Ranging) systems that have a ± 15-cm vertical
and 3 metre horizontal accuracy.
LIDAR
- an active remote sensing system that uses pulses
of light to illuminate the terrain. By measuring the travel
time of the laser pulse from the aircraft to the ground and
back to the aircraft, a highly accurate spot elevation can
be calculated.
Maps, Charts, Diagrams etc.
Figure 1
Figure 2
Figure 3: (to be provided)
Figure 4: (to be provided)
Figure 5
Figure 6
Links of Interest and Resources
SHOALS (Scanning
Hydrographic Operational Airborne Lidar Survey)
Airborne
Laser Mapping (A reference source on an emerging LIDAR
technology)
Definitions:
What is a Digital Elevation Model?
A DEM (Digital Elevation Model) is a digital map of elevation
data. These maps, a type of DTM (Digital Terrain Model), are
raster data meaning that they are made up of equally sized
gridded cells each with a unique elevation
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