Vaughan, King, Caledon, and Brampton
TOPOGRAPHY
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A Site District is a polygon feature that identifies a subdivision of a Site Region based on a characteristic pattern of physiographic features which distinguish fairly large areas from one another.A Site Region is a polygon feature that identifies… Read more.
Download topographic vector data for all of the United States.
From their main web page: "A partnership designed to facilitate access to information for health planning with the overall goal of producing action to reduce health inequalities." No longer updated, but many maps archived.
Raster images of scanned British Columbia topographic maps. see: U:\Geodata\Canada\BC\topo\cloverpoint on local intranet
Note that some layers are free to download. Others must be requested through the Map and Data Library. All roads can be found for public use at this url http://gis.ny.gov/gisdata/inventories/details.cfm?DSID=932