GeoTec 2007 presentation on Automated Watershed Boundary Generation

I'm giving a talk at GeoTec 2007 in Calgary entitled "WaterBuG: An Automated Generator for Watershed Boundaries". This covers a project I've been working on for the last year-and-a-half. It's a very cool application of complex large-scale geo-processing, using a whole assortment of nifty geometric structures and algorithms such as:

• quad-edge subdivisions for modelling
  
• Triangular Irregular Networks (Delaunay triangulations)Delaunay triangulation refinement
• Medial axis refinement
• Surface modelling with a TIN
  
• Surface hydrological flow modelling over a TIN
• Flood filling
• Depth- and breadth-first Graph traversal
  
• Topology-preserving Linestring smoothing
• Discrepancy detection
  

Here's a couple of screenshots from the talk - I'll post the full presentation sometime soon, somewhere...