Ontario Base Map Data
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.
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.
Scholars GeoPortal (updated topographic themes, OBM index)
ftp prod.library.utoronto.ca\OGDE\OBM\ (staff access)[.shp, .pdf]
MapPC - maps on 15 CDs
Niagara OBM index [request PDF map number]
Paper OBMs of Niagara are available in the MDGL - MapLib G 3461 N53 A1 1984 O56
Sample Citation Format
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).
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.