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Ontario Base Maps

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Provider

Ontario Ministry of Natural Resources

Description

Consists of a series of topographical map tiles equivalent to Ontario Base maps in paper format. The maps provide a high level of detail and accuracy and are the basic input tile for the Ontario Digital Topographic Database. Includes most of Ontario. Southern Ontario is covered at 1:10000; Northern Ontario is covered at 1:20000.

  • Each tile consists of 35 base classes ie, water, roads, contours, buildings etc. 17 of the 35 classes are based on the original OBM layers.
  • OBMs were created and updated between January 01, 1977 and January 01, 2000. They are no longer updated. Use layers from the Ministry of Natural Resources Fundamental Data Set for the most current data.

Format

Choose ArcView shapefiles or maps in PDF format.

— Ontario Ministry of Natural Resources. Land Information Ontario. Ontario Geospatial Data Exchange (OGDE). OBM Data

Coverage

Within the shapefiles directory, map file names are a composite of the easting and northing numbers.For example, a map number derived from the paper Index or online map with this number, 10 17 4050 47450, can be found in OBM directory, Zone 17, with a file name 40504745.zip (Note: the "0" of the northing is dropped)

Access to OBM Shapefiles

Download options include the following:

  • Go to the Geography Network Ontario Basic Mapping free download site. Using the "clip and ship" option users can define the extent to be downloaded. Users must register with the Geography network before downloading. Downloaded data in .zip format is delivered to you email account. To download users need to register and have an email account. After clicking the download button users will be prompted to log in or register.
  • Data Resource Centre Geospatial Metadata Explorer
    Note: to download geospatial data from off-campus users will first need to install CISCO IPSec VPN Access software available (a free download) from the University of Guelph CCS software distribution Web site.
  • OBMs in paper format are also availale in the Map Collection. The indexes are located in the Maps Collection on the lower level of the Library — G 3461.A1 1980. Choose either shapefile or coverage format. (.zip format)

Projection

Map Projection: Universal Transverse Mercator

Datum

Horizontal Geodetic Datum: NAD83

Vertical Geodetic Datum: CGD28-CDN

Scale: 1:10000 for southern Ontario and 1:20000 for Northern Ontario

Citation

Produced by [insert name here] under Licence with the Ontario Ministry of Natural Resources
© Queen's Printer for Ontario, 2003.

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Data Access

Contact

519–824–4120 ext. 56417

Visit

The DRC is located behind the Research Help desk in the McLaughlin Library.

Check DRC help hours

Last updated November 2nd, 2009 by D.B. (details)