OPALS - Orientation and Processing of Airborne Laser Scanning data

OPALS stands for Orientation and Processing of Airborne Laser Scanning data. It is a modular program system consisting of small components (modules) grouped together thematically in packages. The aim of OPALS is to provide a complete processing chain for processing airborne laser scanning data (waveform decomposition, quality control, georeferencing, structure line extraction, point cloud classification, DTM generation) and several fields of application like forestry, hydrography, city modelling and power lines).

User documentation

OPALS packages

The functionality of OPALS is grouped in packages, each with a specific focus. The package list below follows a typical ALS processing chain from raw sensor data analysis, via DTM generation to thematic applications. Each package consists of a series of modules and corresponding process control scripts.

  • Package opalsPreprocess deals with full waveform analysis and 3D point cloud derivation
  • Package opalsQuality implements a complete ALS quality control and documentation procedure
  • Package opalsGeoref provides a framework for mutual orientation and georeferencing of ALS scans
  • Package opalsGeomorph contains tools for automatic 3D structure line extraction and interactive line editing
  • Package opalsClassify features conventional ALS terrain point filtering and machine learning based 3D labelling
  • Package opalsSurface covers interpolation and visualisation digital surface and terrain model (DSM/DTM)
  • Package opalsHydro summarizes tools for laser bathymetry like refraction correction, water surface modelling, etc.
  • Package opalsForest provides scripts for forestry related applications (delineation, biomass estimation, etc.)

For inquiries and feedback please contact the OPALS Team