Quebec Topographic Maps at 1:20,000 Scale

Quebec's official topographic base maps cover territory south of the 52nd parallel, derived from aerial photography at 1:40,000 scale. Each file provides approximately 250 km2 of area coverage with planimetric accuracy of about four meters. The Government of Quebec produced these maps, which are no longer updated.

Use Cases

• Analyze hydrography features like lakes and rivers for watershed modeling and flood risk assessment.
• Classify vegetation types such as forests and peatlands for land cover change detection.
• Extract transport infrastructure data including roads and bridges for regional network analysis.
• Model terrain relief using level curves with typical 10-meter equidistance for digital elevation models.
• Identify man-made constructions like buildings and equipment for urban planning and asset inventories.

Strengths

• Provides planimetric accuracy of approximately four meters for spatial features.
• Each file covers a substantial area of approximately 250 square kilometers.
• Includes multiple thematic components: hydrography, vegetation, infrastructure, and relief.

Limitations

• The dataset is no longer updated, making it temporally stale for current applications.
• Lacks quantified metadata on total file count, size, or specific row/column structure.
• Coverage is limited to territory south of the 52nd parallel, excluding northern Quebec.

Provenance

Source

Government and Municipalities of Québec

Collection Method

Extracted from aerial photographs at a scale of 1:40,000 taken at 6,300 meters altitude.

Time Range

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Freshness

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Geography

Almost all territory south of the 52nd parallel in Quebec, Canada.