Urban Topographic Contours from 2014 LiDAR Survey

Urban perimeters in Quebec, including Rouyn, Noranda, Granada, Évain, Lac-Dufault, and the airport, have topographic level curves derived from a May 2014 LiDAR survey. The data features an equidistance of 25 cm with absolute planimetric accuracy of approximately 40 cm and altimeter accuracy of approximately 20 cm. It is provided in multiple geospatial formats including GEOJSON, CSV, and KML.

Use Cases

• Generate 3D urban terrain models using the 25 cm equidistance level curves for visualization and planning.
• Assess planimetric accuracy for urban infrastructure projects by analyzing the XY coordinate data with ~40 cm precision.
• Calibrate elevation models or validate other survey data using the Z-axis data with ~20 cm altimeter accuracy.
• Conduct change detection analysis for urban perimeters by comparing these 2014 contours with newer elevation datasets.

Strengths

• LiDAR-derived data provides high-resolution topographic contours with a 25 cm vertical interval.
• Quantified accuracy metrics: ~40 cm planimetric (XY) and ~20 cm altimeter (Z) accuracy.
• Covers multiple defined urban sectors, providing focused geographic coverage.

Limitations

• Data is from a single 2014 survey, making it temporally stale for current analysis without updates.
• Partial coverage of the Évain sector may limit completeness for that specific area.
• Lack of disclosed sample data or schema (columns unknown) complicates immediate integration.

Provenance

Source

Government and Municipalities of Québec

Collection Method

Derived from a LiDAR survey.

Time Range

May 2014

Freshness

null

Geography

Urban perimeters of Rouyn, Noranda, Granada, Évain (partially), Lac-Dufault, and the airport in Quebec, Canada.