Natural Resources Canada recently added a new data layer to the Federal Government Open Data portal to help with emergency management (particularly for flood and earthquake risk analysis).
The data layer consists of delineated building footprints with height and elevations automatically extracted from airborne LiDAR data, high-resolution optical imagery or other sources.Automatically Extracted Building Footprints Open Data for Eastern Canada
The data set available in vector format contains close to 1 million building footprints in several different geographies across the county.
https://open.canada.ca/data/en/dataset/7a5cda52-c7df-427f-9ced-26f19a8a64d6
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