Emix VLF - VLF Processing
EMIX VLF is a presentation and
processing package for VLF data. VLF field data can be
presented as profiles and contour maps. Data can be
filtered using either the FRASER or HJELT filters.
Results are displayed as either contour maps, profiles,
or contoured profile sections.
Apart from displaying VLF data EMIX
VLF provides the user with two data filters. The FRASER
filter converts crossovers of the correct polarity into
peak responses by differencing successive values of the
tilt-angle along the survey profile.
The HJELT filter profiles are
obtained by using the linear fit theory to solve the
integral equation for the current distribution, assumed
to be located in a thin horizontal sheet of varying
current density, situated everywhere at a depth equal to
the distance between measurement stations.
EMIX VLF was designed to read
inphase and queadreature VLF data from instruments and
files into a grid based data set. Easy to use editors
allows for keyboard entry of data collected on a non
digital instruent or for the editing of recorded data.
Data sets are then saved in a binaryfile for quick and
The main feature of EMIX VLF is the
interactive graphics viewing screens. The first optio is
the single map view that allos the user to view a
contour map of any of the following datasets: Inphase
data Quadrature data, Amplitude, Phase, Fraser inphase,
Fraser quadrature, Fraser amplitude, and Hjelt inphase.
The second interactive graphics
screen allows users to display two maps side by side
with interactive profile selection from the map
displays. Any of the datasets available for viewing in
the single map mode are available for either of the maps
in the dual maps display mode.
Features available in both of the
interactive graphics screens include:
Full Zoom and Replot
Direct haedcopy ouput of
Contour line on/off toggle
Data posting on/off toggle
Contour color and value editing
Besides the interactive graphics
screens EMIX VLF produces plate style graphics output.
EMIX VLF software and manual.