






ReflexW
2D
GPR Data Analysis Module
Example of the point mode
display of 2 different GPRlines and the additional
magnifying zoom option

GPR (Ground Penetrating Radar)

Reflection Seismics

Refraction Seismics

BoreholeBorehole Wave Data
REFLEXW is the new WindowsNT/9X/2000
software generation of REFLEX for the 2dimensional
processing and interpretation of Ground Penetrating
Radar (GPR), reflection and refraction seismic.

Example of the wigglemode display
of a seismic refraction section


Example of the plot options panel

This 2D GPR Data Analysis
Module described below can be upgraded to perform 3D
Data Interpretation
2D dataanalysis
The module 2D dataanalysis
allows the complete 2dimensional processing of single
shots, zero offset lines or multishot gathers. The
module is useful for the following applications (right):
Import data
An import option allows the
loading of the data for almost all existing GPR and
seismic data formats. Single sections as well as a
profile sequence (automatic assembling and storing of
the sections under one single ile or automatic
generation of datafiles for parallel and
inlinesections) may be imported

Display of the data either in wiggle
(see right figure above) or filled area point mode

"Normal" reflection (time axis from
top to bottom) or refraction (time axis from bottom
to top) display

Continuous display of the current
mouse position parameters including time, distance,
amplitude and depth

Zoom and autoscroll possibilities

Loading of a secondary profile,
horizontal or vertical splitmode or overlapping of
the profiles =

The user may switch between two
different scale modes:

The data are completely plotted
into the actual window with subsequent free
zooming and moving possibilities

Trace based scale: the user
chooses the pixel size for each trace. If the
line is not completely plotted into the window
moving possibilities are available.

Interactive magnifying glass option
(see left figure above) with choosable zoom factor 
a freely choosable data part is continuously
magnified when moving the mouse

Interactive color amplitude
assignment for point mode  display of the profiles
in the point and wiggle mode

Many different plot options, e.g.
rotated display, combination of wiggle and point
mode, free choosable axis and so on (see central
figure above)

Easy transfer of the data to the
clipboard

Printing out the data with freely
choosable scale either in cm or scale like 1:1000;
support of banner output (continuous printing on
printers which support banner output, e.g. HP
Deskjet 1120 C).

Stack printing of a complete set of
2Dlines using the same printing parameters

Oscilloscopefunction  wiggle plot
of the actual trace with the indication of the
actual amplitude, time and frequency

Comprehensive context sensitive
online help
The data processing possibilities
A single radargram or
seismogram section can be interactively processed.
Primary and secondary profiles are displayed
simultaneously. The batch mode allows the automatic
processing for a choosable number of lines. A sequence
of processing steps will be applied on an arbitrary
number of profiles. The batch mode runs totally
automatically. Primary and secondary profiles will be
displayed, whereby a direct control of the result is
given. All processing steps are stored for each profile
and can be edited at any time. The data processing is
completely interactive. The effect of the filter is
online controlled when changing the filter parameters by
showing both the original and filtered trace. All edit
inputs may be entered either interactively in the
original profile or using the table input.

Example of a processing function
panel


Example of a 1Dfilter panel


An overview of the different
processing functions:

Editing functions (like removing,
extracting of single traces/trace ranges, muting,
stacking, subtracting or adding of profiles and much
more).

Horizontal scaling of the data,
automatically or manually or by a combination of
both.

Flipping the profile in xdirection
or ydirection.

Static correction (interactive input
of the correction values, slant stack correction and
so on).

Gainfunctions in horizontal und
vertical direction, AGC (Automatic Gain Control),
automatic trace
balancing, linear and exponential gain function,
automatic gain based on mean amplitude decay curve
(see left figure on page 2)

A great variety of 1Dfilters like
bandpass, notchfilter, time dependent bandpass,
crosscorrelation, arithmetic function, averaging,
medianfilter, deconvolution, complex trace analysis
(instantaneous frequency, phase, envelope),
timedepth conversion, background removal,
declipping and so on.

Spectral analysis  single spectra,
movingwindowanalysis.

Migration  2D Kirchhoff, 2D fkmigration,
2D Finite Difference migration with lateral varying
velocities, 3D
Kirchhoff.

Some other 2Dfilters like
subtracting average, running average, compress and
expand and so on.

Fkfilter with the possibility of
manually input the filter range within the fk
spectrum or by defining a
velocity fan. Different tapers and taper width are
available.

and much more possibilities

All processing steps are stored in
the header of each profile and can be asked for at
any time
Velocity Analysis
An interactive
hyperbolaadaptation for a simple determination of the
average velocity from a zerooffset or CMP profile is
integrated. It is possible to adapt diffractions,
reflections and straight lines. You may change the
velocity, the radius of the target, the angle between
the profile line and the target and the width of the
calculated diffraction or reflection hyperbola. There is
also the possibility of fitting linear features either
by changing a line interactively or by setting two
points. The option core allows to vary interactively the
velocities of the single layers of the individual cores
stored within an ASCIIfile. In addition an interactive
use of the intercept time method for seismic refraction
data is included. The option enables to get a first
1Dmodel very quickly. The velocities may be stored on
file and may be reloaded at any time. The velocities are
combined into a 2Dmodel by using a special
interpolation. Such a 2Dvelocity distribution may be
used in a subsequent step for the migration or the
timedepth conversion.

Example of a layer show


Picking of the first arrivals of
a refraction data set

Picking the onsets/first arrivals
The picking option allows to
pick the travel time and the amplitude of different
onsets like reflectors or hyperbola or the first
arrivals. You have the choice between manual picking,
continuous picking and a semiautomatic picking using a
phase follower (manual editing is always possible). The
picked values may be corrected to the extreme or the
zerocrossing. In addition a time/distance correction to
the maximum value within a given window is available.
This allows you for example to pick the hyperbola cusps
very quickly. It is possible to export the picks into an
ASCIIformat together with the 3 space coordinates for a
subsequent interpretation. The so called layershow
offers the possibility to combine individual pick files,
to plot them together with the wigglefiles and to
output them in report form on printer or file containing
the depths, velocities and amplitudes of the individual
layers. The timedepth conversion of the picks is either
based on a constant velocity for each layer or on a
2dimensional velocity distribution allowing to take
into account vertical and lateral velocity changes.

Use of the intercept time method
for refraction data


Use of the diffraction adaptation
for 2 different GPRlines








