DepthConversion

Seismic Depth Conversion using Quadratic Functions

• Given a oneway time depth pairs, a quadratic function is fitted
  resulting in 3 coefficients, a0, a1, and a2

• Given seismic horizon as an x, y, z file, ztqsegy.py
  will convert the horizon from time to depth or depth to time.

• Quadratic coefficients can be just one set or supplied as three
  columns in one file or in three seperate files.

• Probabilities in the depth is computed from the computed
  P10, P50, and P90 of the corresponding coefficients.

• ztqsegy.py can also read in a segy in time or depth and convert
  that outputting another segy in the other domain.