Full-waveform ALS workshop - Breaklines and DTM filtering with FWF ALS

Eighth Presentation

Christian Briese: Breaklines and DTM filtering with FWF ALS


Overview:

• Motivation
• Structure line extraction
- Automated structure line modelling
- Automatic start segments
• DTM generation
- Standard methods
- Improvement by full-waveform (FWF) ALS
• FWF attributes
• FWF data management
• Improved DTM generation based on an echo width threshold
• Extended robust interpolation by individual a priori weights determined from FWF
attributes





Summary:
Improved DTM determination with FWF ALS

• Additional Information available by FWF ALS data
Per echo: distance, amplitude, echo width, cross-section
• Interesting results in order to detect last echoes reflected by low vegetation
• Further studies are still necessary:
- Analysis of the influence of the footprint size, the incidence angle, …
- Analysis of the accuracy and reliability of the FWF attributes (distance, echo
width, amplitude, …)
- Comparison of different sensors
• Extension of the Filtering and Classification Methods
- additionally to the typically purely geometric criteria – additional FWF echo
attributes are available and should be integrated into the classification process
- however, a large area based detailed analysis of the advantages of the FWF
attributes is necessary in the future