Raytracing in GOCAD

@inproceedings{VeltenRM1998a,
 abstract = { How ta define a model for fay tracing i5 important for bath stability and efficacy of the tracing. After many ways explored and tested, a simpler way 15 chosen to define models. This way is closer ta geophysical needs than before, and does Dot on1y consider geometrical aspects of the model. The z-axis is seen as preferred direction along which parameters vary. A unified method lS presented ta estimate amplitudes. The method used before to calculate geometrical spreading by evaluating ray propagator matrices along rays was given up. Instead a method-independent way ta estimate geometrical spreading using wave front cells was implemented. Alsa a more symmetric split aIgorithm for wave fronts is presented,which improves the quality of the wave front's splitting, as triangular cells are doser to equilaterality than before. At last a strategy is presented to preselect those parts of a wave front at source level which will later arrive in the target zone. By this, precision of calculations can be increased as weil as computation time decreased. },
 author = { Velten, Wolfgang },
 booktitle = { 17th gOcad Meeting },
 month = { "june" },
 publisher = { ASGA },
 title = { Raytracing in GOCAD },
 year = { 1998 }
}