Diffract is software to analyze diffractions found in a basic fixed-offset ground-penetrating radar (GPR) survey.
Diffract uses five different windows: the Model Window, the Plot Window, the Data Window, the Section Window, and the Fit Window. Many of these windows share the same basic menu items.
A typical use of Diffract is to make an initial velocity model and insert trial diffractors equal in number to those seen in data within the Model Window. GPR traces (displayed as wiggle traces) can be viewed in the Plot Window to see that the diffractions produced somewhat resemble those observed. The arrival times of selected waves can be seen in the Data Window, where observed values can be typed in. Once some values have been inserted, they can be fit interactively using the Fit Window. If a satisfactory fit is found, the properties of these fits can be used to update the positions of the diffractors and the velocity structure in the Model Window. This new model can then be adjusted manually to provide the best possible fit to the observations.