Cartographic Output

The path that each boat took over the course of the simulated day was determined by tracing a least cost path from specific origins and destinations supplied by the individual boats' iteneraries by the following heuristic:

• If the destination is outside of the study area, the boat's destination is considered to be the point (coordinates) at which it leaves the bay.
• If the destination is a specific site within the study area (Quay, Marina Jacks, etc.), then the coordinates of that site was as the destination.
• If the destination is one of a number of points (yacht clubs, reefs), then one of the destinations is randomly chosen and its coordinates given as the destination.
• If the destination is within an area described by a polygon (open bay, fishing flats), then a location is randomly selected inside the polygon and given as the destinaion.

Each path was written to an individual grass-GIS coverage. The coverages were added together into various combinations for analysis and display.