Quebec High-Resolution Hydrographic Network Geobase

A 2026-updated geospatial dataset provides a high-precision (1/2,000 scale) 3D linear geometric network of Quebec's hydrography, derived from lidar data. It models flow continuity and direction across streams, lakes, and wetlands, produced by the Ministry of the Environment, the Fight against Climate Change, Wildlife and Parks (MELCCFP). The deployment covers southern Quebec and includes attributes like priority level, Strahler order, and linear referencing.

Use Cases

• Model water flow direction and accumulation using the 3D linear geometric network and flow direction matrices.
• Analyze stream network hierarchy and connectivity with attributes like Strahler order, Horton order, and network connection.
• Conduct watershed analysis by integrating hydrocoherent digital terrain models (GeoTIFF) and flow accumulation matrices.
• Update cartographic hydrography by correcting potential flow bed paths and integrating updated hydrographic surfaces from photogrammetry.

Strengths

• High geometric precision at a scale of 1/2,000.
• Includes a 3D linear network modeling flow continuity across all aquatic entities.
• Provides multiple data products: geometric networks, terrain models (GeoTIFF), and flow matrices (GeoTIFF).
• Deployment follows defined completeness levels (NC-1, NC-2) for progressive validation and enhancement.

Limitations

• Data has no legal value and the broadcaster does not guarantee accuracy, precision, or completeness.
• Full territorial coverage of southern Quebec is progressive and not yet complete.
• Specific row counts, column counts, and sample data are unavailable from the input.

Provenance

Source

Government and Municipalities of Québec, produced from lidar data by the hydrographic division unit (UDH).

Collection Method

Modeled from lidar-derived potential flow beds and completed by central flow lines, in partnership with MELCCFP.

Time Range

null

Freshness

Last updated March 2026.

Geography

Southern Quebec territory.