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This declassified satellite image of Montreal, Canada was captured on 16 June 1971 by a KH-9 HEXAGON spy satellite, during mission 1201.
Each pixel covers about 1.3 meters on the ground.
The original scene is held by the USGS EarthExplorer archive (entity ID D3C1201-100004A017).
Learn more about the HEXAGON programme on the Satellite Programs page.