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The module 3D data-interpretation allows the interpretation of 3-dimensional data by displaying x-, y- or z-slices. The module is useful for the following applications:

  • GPR (Ground penetrating radar)
  • reflection seismics

The 3D-datainterpretation includes different possibilities of handling 3D-data:

 

    - load up to 25 different 2D parallel or non parallel lines

    - create single timeslices

    - create and interpret a complete 3D-datablock

 

 

load different 2D lines:

 

The module also allows  to load several (up to 25) different 2D-files in order to display them within the different modes scroll and window (see below). The scale of the different 2D-files can vary.  

 

create single timeslices:

 

In addition you may construct single timeslices (C-scans) from different 2D-lines originating all from one acquisition plane. The profiles can be arbitrarily orientated. Alternatively, data with different geometries sorted after midpoint-coordinates may be also used for the calculation of the timeslices. The spatial interpolation ranges can be freely determined. The timeslice is considered as a simple Reflexw section - all processing and display possibilities within the 2D-dataanalysis module can be applied on.

 

  

 

 

 

create and interprete a complete 3D-datablock:

 

 

The 3D-data may be easily constructed from equidistant or non-equidistant 2D-lines either during the import or in a later stage.

 

Equidistant:

 

Only the distance between each line must be entered. An interpolation filter allows a resampling of the data in the direction of each line if the number of traces differ in each 2D-line.

The Scan3D tool allows to automatically analyse parallel and crossing lines. 

 

This module is also available as a standalone program: support

  

 

 

 

Nonequidistant:

 

 

  

 

 

The lines may be arbitrarily orientated. Also crossing lines may be taken into account. Alternatively, data with different geometries sorted after midpoint-coordinates (e.g. from GPS-coordinates) may be also used for the calculation of the timeslices. Analogous to the creation of the single timeslices the spatial interpolation ranges can be determined  freely.

 

The data are completely loaded into the RAM of the computer whereby a fast visualization of the data is possible.

 

 

Rescaling or subdivision for 3D-dataset:

The max. number of points in each direction is restricted to 1024. If the points exceed this boundary Reflexw offers two possibilities rescale and subdivide: The option rescale automatically calculates rescaling factors in all directions where the number of points exceed the 1024 boundary. The option subdivide will only be enabled if only the number of points in line direction exceeds the 1024 boundary. Activating this option generates a number of subdatasets of the complete 3D-dataset in this direction.

 

Apart from the 3D-cube display (see below) two different display modes scroll and windows are available.

 

A second 3D-data file can be viewed in addition for a direct comparison.

 

 

Scrolling the 3D-datablock

Using the option "scroll" (see left figure on the right) you may continuously move through the 3D-cube either in x-, y- or z-direction using the track bar. The step and smoothing rate is freely choosable.

 

Optionally the actual timeslice (based on the envelope data) depending on the mouse position is shown in a second window . The actual cursor position is marked by a cross within the timeslice (see right figure below: X-Distance = 0.49 m, Y-Distance = 0.05 m). If the cut option slices has been activated the x- and y-cuts corresponding to the actual mouse position within the timeslice will be shown within the second window (see left figure below).

 

 

 

Windowing the 3D-datablock

 

Using the option "windows" the slices are displayed in manually scalable windows. Again the step and smoothing rate may be freely chosen.

 

 

 

A MPEG moviefile for the later use with a MPEG-player may be easily constructed for the scroll and the 3DCube (see below) mode.

 

 

 

3D-picking

 

3D-Picking may be done within the individual 2D-cuts (scroll or windows mode) or within the 3D-datacube display. You have the

choice between manual picking and continuous pick. The 3D-pick surfaces may also be included within the 3D-cube.

 

 

 

 

3D cube-display

 

The 3D-data can also be displayed within a 3D-cube. The program supports an interactive rotation of the 3D cube. The data can be viewed from any direction and can be zoomed. The 3 axis may be freely labelled.

You may select if only the front or back planes of the datacube are displayed or the full 3D-data volume. In addition you only may select single cuts and scroll through the cube in one distinct direction.

 

 

With the options front or back activated only the front or back planes of the datacube are displayed. In addition you may select a distinct cornerpoint which serves as the starting point for a cutting out of the cube:

 

  

 

With the option single activated you may select any combination of x-, y- and z-cuts.

 

 

 

 

 

With the option scroll activated it is possible to continuously move through the 3D-cube either in x-, y- or z-direction using the track bar. The step rate is freely choosable. It is possible to plot a "background" consisting of any combination of x-, y- and z-cuts in addition.

 

With the option full activated all data of the 3D-cube are displayed. Shading and hiding are supported. Not visible parts of profiles are covered. However there is the possibility to "look through" certain parts of the 3D-data volume, whose amplitude values are smaller than the given threshold value.

 

With the option shading activated a special shading algorithm is used in addition.

 

  

The picked surfaces may also be included within the 3D-datacube.

 

  ©Sandmeier Scientific Software 2007