Product Information and GIS Download
Published 2006
Bedro ck Topography and Overburden Thickness Mapping, Southern Ontario
This release contains bedrock topography and overburden thickness maps for southern Ontario in ESRI® ArcGIS® (Grid) format. The bedrock topography (elevation) map was created from point data from a variety of sources including water well records, geotechnical borehole records, oil and gas well records, existing geologic maps and field observations. These core data sets are also available in ASCII text format for non-ESRI® users. This release contains files for GoogleTM Earth users. This release also includes a report (.pdf) format outlining the protocols and methodology developed by the Ontario Geological Survey (OGS) to generate regional bedrock elevation and overburden thickness maps for southern Ontario. Details of the data sets are provided in a readme (.pdf) file and a metadata (.pdf) file.
Gao, C., Shirota, J., Kelly, R. I., Brunton, F.R., van Haaften, S. 2006. Bedrock topography and overburden thickness mapping, southern Ontario; Ontario Geological Survey, Miscellaneous Release--Data 207.
The data are available on 1 CD-ROM. $20.00 or can be downloaded free of charge.
Download from Geology Ontario
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Order from OGS Publication Sales

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Data

Drift Thickness Map
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The Drift Thickness Map consists of two layers, Drift Thickness and Ground Surface Shaded.
The Drift Thickness layer contains information about the thickness of the overburden material at a specific location. This was created by simply subtracting the interpolated bedrock surface from the DEM. The cell values are also in meters.
The Ground Surface Shaded layer is a hillshade created from the DEM used for this publication. It is useful as a backdrop for a map composition, but the cell values retrieved from this raster generally have no meaning.
©2006 Ontario Geological Survey
933 Ramsey Lake Road
Sudbury, ON P3E 6B5

DataPoints
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Geotechnical Boreholes

Oil and Gas Wells

Other

Outcrops

Water Wells

Water Wells Not Reaching Bedrock

Drift Thickness

Legend

Drift

Ground Surface Shaded

Tile

Image

Bedrock Topography Map
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The Bedrock Topography Map consists of two layers, Bedrock Elevation and Bedrock Elevation Shaded.
The Bedrock Elevation is the interpolated bedrock surface created from the data points. The interpolation was done using the ordinal Kriging method available in ESRI� ArcGIS�. For the most part, the cell values are a reflection of "Kriged elevation." However, for the areas known to have thin overburden material, the bedrock elevation was calculated using a more "depth-centric" approach. For the thin-drift areas, a temporary grid was created by interpolating the depth to bedrock, which was subtracted from the DEM to create the derived bedrock elevation grid. The two bedrock elevation grids were combined (and smoothed around the boundaries) to produce the final grid
The Bedrock Elevation Shaded layer is a shaded relief grid created from the above bedrock elevation surface. It is useful as a backdrop for a map composition, but the cell values retrieved from this raster generally have no meaning.
�2006 Ontario Geological Survey
933 Ramsey Lake Road
Sudbury, ON P3E 6B5

Bedrock Elevation

Rock

Bedrock Elevation Shaded