On approximating Fourier integral transforms by their discrete counterparts in certain geophysical applications

In the past, fast Fourier transforms (FFT´s) have been used in geophysical data analysis and, with some success, in theoretical analysis. However, in the general situation when neither the function nor its transform image is of compact support, the digital transforms inevitably introduce aliasing errors in both the domain and range space. A technique to assess and minimize this error is given for a restricted set of functions.