A. DDS Generalization

Dataset Dictionary data= oak39_@ format=segy ... axis= t y cmp ... size.t= 1000 size.y= 96 size.cmp=24 ... delta.t= 0.008 units.t= sec ... origin.y= 5000 units.y= meters ... Binary Data Card Header Line Header Traces...

N-Dimensional Array of I/O Records Densley popoulated for random access Sequential access if sparse Meaningful Axis Names t, x, t, z, w, kx, ky, kz, cmp, shot, offset, ... Extensible Axis Attributes Regular grid (size, origin, delta, units, ...) Variable grid (grid.z= 1 3 5 7 11, ...) Non-numeric (label.attr= Vp Vs rho) Great for research! Exotic algorithms and unforeseen domains can be accurately represented and processed as easily as traditional ones.

B. Mixed Processing Systems

DDS can integrate directly with other systems. Here a DDS program, editd, (note input format can be auto-detected) is piped directly into a SU program, supswigp.

editd in=minute2.usp 3s=16 3e=48 3i=2 out_format=su out_data=stdout: |\
supswigp clip=0.2 > wiggle.ps
    

C. Multi-File Suppoort (Sliced Datasets)

DDS dictionaries can point at other dictionaries

Dictionary data= dict.comp1 dict.comp2 dict.comp3 format=segy slice.comp axis= t h comp cdp size.t= 1000 size.h= 48 size.comp=3 size.cdp=24 delta.t= 0.008 delta.h= 25 delta.comp= 1 delta.cdp= 25 origin.t= 0 origin.h= 0 origin.comp= 0 origin.cdp= 0 units.t= sec units.h= meters ... Dictionary (dict.comp1) data=data.c1.segy format=segy axis=t h cdp ... Binary Data SEGY Binary file: "data.c1.segy" Dictionary (dict.comp2) data=data.c2.segy format=segy axis=t h cdp ... Binary Data SEGY Binary file: "data.c2.segy" Dictionary (dict.comp3) data=data.c3.segy format=segy axis=t h cdp ... Binary Data SEGY Binary file: "data.c3.segy"

† Taken from Joe Dellinger's EAEG presentation June 2006