Landmark's TDQ™ software, a set of simple depth conversion tools for interpreters, performs time-to-depth and depth-to-time conversions of seismic data, horizons and faults. TDQ tools leverage the accuracy inherent in your existing well and seismic data to construct 3D velocity models. Using the model calibration capability in TDQ software, you can combine seismic (less accurate but densely sampled) and well-based (highly accurate but sparsely sampled) velocity models to quickly build a velocity model for depth conversion.