Magnetometer Logging and Processing Software

MAGLOG NT/ MAGLOG Lite
Data acquisition, real-time display, and play back of magnetometer data from airborne, marine and land systems. Stores data in format suitable for post-acquisition processing. Records any serial data string so can be used in conjunction with eg. EM-61, GPS, bathimetry. Download MagLog from our FTP site here.

MagMap2000
MagMap and MagMap Lite are preprocessing tools that read GPS/Mag records and converts them into UTM/Transverse Mercator system based on standard or custom ellipsoids. Filters GPS positions to eliminate errors and smooths the track as required. Layback calculations are included. Exports results in the format suitable for other gridding and contouring programs and for usage by Magpick. Download MagMap from our web site here.

MAGPICK Magnetics Processing Software.
This free powerful data processing and modeling package provides data base management, file  importation, gridding, contouring and dipole pattern matching source body modeling for the  experienced geophysicist or potential field  data processor. Output includes a table of target anomaly locations and depths. Includes pre- processing of GPS locations and data reformatting. Download MagPick from our web site here.

 MagPick provides visual analysis of the magnetic map and manual or automatic selection of anomalies.  Includes: Viewing the magnetic map with dynamic  adjustment of color scale in accordance with min/max of the data. Program allows enlarging or zooming into different parts of the map and presenting zoomed  sections in separate windows with automatic change of the color scale to fit the data range.

IGRF (Earth's magnetic field) model till 2005 plus UTM transformation is included.
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MagPick interpolates the map grid based on profile data using splines in a tension algorithm or by triangulation. The map can be viewed in different modes including colors, contours, shaded or illuminated relief. MagPick allows the user to increase resolution of existing maps with a bi-linear or spline interpolation and also provides a utility to smooth the grid using a relaxation algorithm.

For residual (total field minus local IGRF field)  magnetic maps, MagPick provides tools for pward/downward continuation, reduction to the  pole and synthetic gradient calculation.

Additional information such as lines, polygons and annotated points can be drawn and then loaded as an overlay on top of the magnetic map.

Visual analysis of the profile data includes loading of initial (profile) measurements and plotting their geometrical positions on the top of the map. The observed magnetic field can be viewed as a set of linear graphs such as T(x), T(y), T(l) and T(p) where T is the field, x,y are planar coordinates of observed points, l is the distance along the profile,  p is the projection of the profile on a line selected by user. Markings on the profile automatically appear on the map view and vice versa.

The following operations are available for profile data:

1. Spline smoothing and regional field removal.
2. Erasing parts of the profile.
3. Exporting profile data in user-drawn a polygon,  thus creating a   set of profiles.
4. Scaling of the profile data.
5. Allows plotting of annotated stacked profiles.
6. Shifting profile positions.
7. Layback calculation (as in MagMap2000).
   
    

LOCATING MAGNETIC SOURCE BODIES. Magpick does a  quantitative interpretation based on fitting of the observed magnetic anomaly using the field of a simple source. Both map or profile information can
be used, and geometrical and magnetic parameters of the source can be estimated. Presently two types of sources are modeled:A. Magnetic dipole (magnetized sphere). The position  and depth of the center are estimated.

B. A horizontal magnetic line of finite length.  Pipe sections can be modeled by such a source.
   Positions of the ends and depth of the pipe are to be estimated.

In order for the Dipole Interpretation package to function properly, it requires starting points from which to converge on the source body location. That data is supplied by the following two techniques:

SIMPLE MAGNETIC ANOMALY PICKING: Allows the user to select two points with a mouse and store their positions in a file. Interpretation routine assumes that the X-Y position of the body is between the
local minimum and maximum of the field.

ADVANCED MAGNETIC ANOMALY PICKING: User selects rectangular regions of maxima and minima field values and the program automatically locates the precise position.

During interpretation, magpick provides interactive selection of the data by using the zoom window or
by restriction of the polygonal shape.

Results of the interpretation are presented in the form of a worksheet and are plotted on the magnetic maps. QC analysis is performed by comparing observed and synthetic magnetic fields.
 
Both Windows or Unix versions are available. Also, training programs available.Windows Program and Manual are available from  ftp://geom.geometrics.com/pub/mag