|
Plus & Magix XL
MAGIXPlus & MAGIX XL
Gravity and Magnetics Modeling
General
The MAGIX family of software models data in 2, 2.5, and 2.75
dimensional earth models consisting of bodies and layers whose forward response matches
the input data along a single profile line.
All the software packages in the MAGIX family use a
generalized "2.75 dimensional" model to compute the theoretical gravity and
magnetic response. The 2.75 D model represents the geology as polygonal prisms with
horizontal axes and either finite or infinite extent in the strike direction. The strike
direction need not be perpendicular to the plane of the profile. The forward model is
based on the Rasmussen and Pedersen method.
The MAGIX family uses Inman-style ridge regression for the
inversion calculations. This is a nonlinear least squares approach for obtaining the model
which best fits the observed data. Parameters that may vary during an inversion include
density, susceptibility, or the vertex of a body in X, Z or X any Z position.
The magnetic calculations take into account both induced
magnetization and possible remanent magnetization. The remanent magnetization is entered
as the inclination, declination and the Koenigsberger ratio.
Data are read into the program via ASCII files of various
formats. Options are available for data input including profile selection from maps and
resampling of long profiles.
Data parameters are set using interactive dialog boxes. The
program can calculate Magnetic or Magnetic Gradient data for Total Field, x, y or z
components. Magnetic susceptibility units supported now include cgs, micro-cgs and SI
units.
Gravity density units include both gm/c3, and kg/m3 and
calculations can be set to micro- or milligals.
Survey geometry is added by using a interactive graphics
screen or text dialog boxes. The graphical geometry editing allows for animation of
selected parameters. This helps the user understand the parameters required to specify the
profiles in the 2.75D space.
Options for geometry include a profile or XY mode of
coordinates and strike directions that is not perpendicular with the profile direction.
Body entry is done using the mouse in an interactive graphics
screen. Keyboard entry into spreadsheet style editors is also available. Bodies are
entered as a series of vertices. A variety of calculation modes can be chosen, one of
which is real-time update of the synthetic response with changes in the model.
Body editing allows for features like vertex locking and
homing, multiple vertex locking, susceptibility and density editing and strike extent
editing. Bodies can be rotated, deleted, copied and split. All body editing can be done in
the interactive graphics screen by mouse click and drag operations.
Keyboard entry and editing of bodies permits the user to
enter model parameters from external sources and define bodies based on know values.
Model parameters can be saved to files for import with new
data sets or comparisons of different models for the same data set. Models used for
gravity data sets can be imported with magnetic data sets to function as starting models.
A variety of Output functions enable the user to save field
data, synthetic data and model parameters to files for import or processing in third party
software.
Graphical viewing is an integral part of the program and the
user has full control over colors, axes labels, scales and data symbols. Autoscaling is
built in with full user control over items to be scaled.
The regional editing allows graphical selection of the
regional. The regional may also be calculated by fitting a polynomial to selected data
points or groups of data points.
Model and data sections can be annotated by using the label
editing sections. Features include mouse controllable sizing, placement and arrow editing.
All labels can be set to a specific size, multiplied by a factor, or constants added to
increase or decrease size.
The following table lists the differences between the
programs in the Magix family. Except for these differences the programs work the
same.
|
Features
|
|
Magix Plus v3
|
|
Magix XL v3
|
|
Maximum number of bodies
|
|
25 |
|
200 |
|
Maximum number of vertices
|
|
240
|
|
2000
|
|
Maximum number of data points
|
|
200
|
|
1000
|
|
Regional removal by fitting a polynomial curve
to data
|
|
N
|
|
Y
|
|
File Input/Output withing the Interactive
Graphics Interpretation
|
|
N
|
|
Y
|
|
Invert for density or sysceptibility for all or
selected bodies only
|
|
N
|
|
Y
|
|
Support for the input and output of LCT data and
model files
|
|
N
|
|
Y
|
|
Resample of profile data using minimum curvature
gridding
|
|
N
|
|
Y
|
|
Reselection of profile from map for XY data
stored in map form
|
|
N
|
|
Y
|
|
Graphical Geometry Editing
|
|
N
|
|
Y
|
Standard Components
MAGIXPlus or MAGIX XL and instruction manual.
Ordering Information
|
Description
|
|
Order Number
|
| Magix Plus v3 |
|
460-400-0010 |
| Magix XL v3 |
|
460-400-0020 |
|
