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QGIS Troubleshooting

Common issues and solutions when working with QGIS and the IGN LiDAR HD library.

Common Issues​

Installation Problems​

Issue: QGIS plugin not loading Solution: Check Python path and dependencies:

# Verify QGIS Python environment
qgis --version

Issue: Missing dependencies Solution: Install required packages in QGIS Python environment:

pip install laspy numpy

Data Loading Issues​

Issue: LAS files not displaying in QGIS Solution: Use the Point Cloud plugin or convert to compatible format:

# Convert LAS to compatible format
from ign_lidar import QGISConverter
converter = QGISConverter()
converter.las_to_shapefile("input.las", "output.shp")

Issue: Large files causing memory issues Solution: Enable chunked processing:

config = Config(
    chunk_size=1000000,  # Process 1M points at a time
    memory_limit=8.0     # Limit to 8GB RAM
)

Performance Issues​

Issue: Slow processing in QGIS Solutions:

  • Reduce point density for visualization
  • Use spatial indexing
  • Enable GPU acceleration if available

Projection Issues​

Issue: Coordinate system misalignment Solution: Verify and set correct CRS:

# Set correct coordinate reference system
converter.set_crs("EPSG:2154")  # RGF93 / Lambert-93

Getting Help​

For additional support: