Presentations at FOSS4G 2007

I'm giving two talks at FOSS4G 2007, which is taking place here in Victoria in September. The abstracts are:

The JTS Topology Suite: Tools, Tips & Techniques

The JTS Topology Suite is one of the most widely used geometry libraries for Java. This talk will review the standard geometry methods in JTS, with an emphasis on their finer details. Some of the additional algorithms and components which the library provides will be discussed. Tips for improving performance and techniques for accomplishing various kinds of geometric processing tasks will be presented. The talk will conclude with an preview of some potential future developments for JTS.

Automatic watershed delineation using open source Java

The B.C. Corporate Watershed Base is a large-scale database of hydrographic information built using open source products. This talk discusses the development of an open source system for automated delineation of watershed boundaries based on CWB hydrography and a terrain model.


If previous years are anything to go by, this conference should be very informative and energizing. See you there!

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...