3D GPR Module

3D GPR Module is developed for processing, interpretation and displaying GPR-data, which is measured in parallel lines. The Module can display profile, cross-section and time-slice views of the 3D-data. Each GPR profile in data can be interpreted separately or with selected profiles simultaneously.

The Module is compatible with Road Doctor™, Road Doctor™ GPR, Geo Doctor™ and Railway Doctor. All Road Doctor™ programs, including free Road Doctor™ Viewer, can display time-slices from saved views also without 3D GPR Module. However, changing the view settings is limited and 3D interpretation is not possible.

The GPR data can be arranged as multiple channels in single data file (3D-Radar, GSSI's Terravision) or as single channel files. The Module has conversion operation for 3D-Radar's frequency domain data, which speeds up display operations.

The Module can handle very large data files and datasets (>>2G), all the data is not loaded in to memory at once, but only the data which is displayed.  A view can include multiple time slices from the same dataset, all from different levels and with different view settings.

The time slice level can be picked up directly from the profile view, scrolled manually using up and down cursors, or automatically using the slice scrolling operation. Similarly, also the cross-section can be scrolled. If video is included the scrolling can be synchronized with the video.

The amplitude in time slice can be defined at fixed time level, or at varying time level based on an interpreted layer. Level can also be defined as an offset time  from the interface. The user can define the window width where from the amplitude is calculated. The amplitude itself can be defined as a mean value, minimum value, maximum value, or absolute value from given time slice window. If the slice level is defined using level of an interpreted layer, the amplitude can be defined from the interpretation points only or also from interpolated points between interpreted points.

The interpretation of the layers can be done in all three view modes. The semiautomatic  layer tracing operation can use previously defined interpretation from single channels to guide the interpretation and to make the possible corrections lesser. All the channels can be interpreted also separately.

The 3D GPR Module can be used also to pick up features which are visible only in time slice or cross-section views. These can be culverts, pipes, etc. The output operation can create text files, which can print these vectors separately including possible x, y, z -coordinates.

The program includes also a special operation, which can be used to scale the GPR-files, which have not been measured at the same time and which can include distance shift, therefore. The user can select quickly on the screen the matching points, which are used for recalculating the scale. The scale is corrected right on the screen without creating new large data files.

The time slices and cross-sections can be shown with any other available dataset including video, images, map, fwd, iri, rut etc.