FFTFIL; a filtering program based on two-dimensional Fourier analysis of geophysical data

Abstract

All routines (Appendix B) are written in Multics Fortran (card image) to be run on the Honeywell Multics 68/80, and can be converted to other computers with a moderate amount of revision by an experienced programmer. The Honeywell Multics 68/80 is a 36 bit word machine and has a maximum floating point number of octal 376777777777. This number is used in the program to flag regions of no data and may need to be changed in conversion to another computer. The program contains a few "calls" to Multics subroutines (primarily manipulating data input and output) that will also require replacement in converting to another computer. The program requires about 32 K words of main memory, independent of variable storage, and has a maximum array size of 32,768 bytes.