Maps, Data & GIS - Fact Sheet

Ontario Base Map Data

Description
Historic topographic data layers based on the Ontario Basic Mapping series (1:10,000) published by the Ontario Ministry of Natural Resources in the mid-1970s. Mapping was updated in the 1980s. Seamless coverage of features include: airports, buildings, contour lines (5 metre contour interval), spot heights, drainage, municipal boundaries, pits, quarries, roads, railways, utility lines, waterbodies and wetlands. This data is useful for topographic information available in the contours and spot height layers. Other layers do not contain detailed attribute records but are useful for visual purposes.

Restrictions
Data accessed from The Geography Network is in the public domain. Proper citation should be used.

Layers accessed through Scholars GeoPortal and PDF maps require authentication of current Brock status.

Access
The Geography Network [GIS formats][Download Instructions]

Scholars GeoPortal (updated topographic themes, OBM index)

ftp prod.library.utoronto.ca\OGDE\OBM\ (staff access)[.shp, .pdf]

MapPC - maps on 15 CDs

Related Information
Niagara OBM index [request PDF map number]


Local \MapLibrary\DATA\Niagara\OBM_pdfs\

STAFF - Accessing OBM maps in PDF format for all of Ontario

Paper OBMs of Niagara are available in the MDGL - MapLib G 3461 N53 A1 1984 O56

Sample Citation Format
GIS layer
Ontario Basic Mapping (OBM) [computer file]. (1996). Peterborough, ON: Ontario Ministry of Natural Resources. Available:
http://www.geographynetwork.ca/website/obm/viewer.htm (Accessed date).

PDF file
Ontario Basic Mapping [computer file]. (2003). Peterborough, ON: Ontario Ministry of Natural Resources. Available: Brock
University Maps, Data & GIS ftp://ftp.library.brocku.ca/NiagaraOBMpdfs/64004780.zip (Accessed date).

*Dates vary, depending on theme. Using GIS software, open the associated attribute table for a given theme to see the
effective date. The date of PDF format data can be seen in the lower left portion of the map image.

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