An interactive PC Windows program (DRIFTAP) has been developed for Environment Canada for generating surface current information using positional data from drifting buoys. The current information, in either vector field or tidal harmonic constant form, is sitable for input to oil spill models. The user interface in DRIFTAP provides extensive control over input data editing, field access, functions for the correction of position errors, track smoothing using polynomial spline-fitting, viewing selected raw and processed drift tracks, interpolation of drift track velocities onto regularly spaced grid locations, smoothing and modelling the field data and viewing or printing of non-gridded and gridded velocities. All data are geo-referenced and can be displayer under several map projections. Future improvements would include the addition of a graphical grid and mask editor and faster execution times thrugh optimization of the grid-point smooting filter.
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