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MAGPICK - Magnetic Map & Profile Processing

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MAGPICK - Magnetic Map & Profile Processing MAGPICK - magnetic map & profile processing. User Guide. Mikhail Tchernychev. 16/02/98 Beta version of the manual - last revised 12/12/2013 Contents 1 Copyrights 6 1.1 MagPick Copyright Notice . 6 1.2 PROJ lib Copyright Notice . 6 1.3 Info-Zip Copyright Notice . 6 2 History and features of Magpick 8 2.1 Version 1.0 - 1996 -1998 . 8 2.2 Version 2.0 - 1998 -1999 . 9 2.3 Version 2.x - 2000 - 2004 . 10 2.4 Version 2.8 - 3.00: 2004 -2009 . 11 2.5 Version 3.20: 2009 -2011 . 11 3 Installation. 12 3.1 System requirements. 12 3.2 Compilation. 13 3.3 MS Windows installation. 13 4 MagPick project files 13 4.1 MagPick project file internals . 15 4.2 MagPick project files environment variable . 16 5 Basic MagPick operation 17 5.1 Magpick as map (grid) viewer. 18 5.1.1 Transforming equalized color palette into gradient. 28 5.2 Drawing and clipping on top of the map . 29 5.2.1 Magpick vector formats: lines, polygons, points, clip area. 29 5.2.2 Bringing an AutoCAD DXF drawing into Magpick. 31 5.2.3 Using ArcInfo(TM) shape files in magpick . 32 5.3 Simple picking of magnetic anomalies . 32 5.3.1 Simple pick. 32 5.3.2 Pick export . 33 5.4 Automatic pick . 34 5.5 Profile information loading and viewing . 35 5.5.1 Profile loading. 35 5.5.2 Simple profile load. 37 5.5.3 Loading profile data using templates . 40 5.5.4 Operation with profiles on the map. 42 5.5.5 Parameters of the profile view. 44 5.6 Latitude and Longitude coordinate grid . 46 5.7 Printing. 48 6 Grid operations. 48 6.1 Making grid out of profile data. 48 6.1.1 Triangulation with linear interpolation . 49 6.1.2 Gridding with splines. 50 6.2 Save grid. 51 1 6.3 Create clip path. 51 6.4 Clip the grid. 52 6.5 Clipping grid file using profile information . 52 6.5.1 Clipping the grid using triangulation. 53 6.5.2 Clipping the grid using profile data points. 53 6.6 Exporting grid data as XYZ file and mosaicking in MagPick. 54 6.6.1 Export into XYZ . 54 6.6.2 Creating and overview map from number of grids . 56 6.6.3 Exporting data from MagPick to Geoplot 3.00 (experimental) . 56 7 Profile data transformations. 58 7.1 Saving and re-loading profile data. 59 7.2 Profile data operations . 59 7.2.1 Cutting profile parts . 60 7.2.2 Removing turns from profile lines. 61 7.2.3 Data smoothing . 64 7.2.4 Linear data transformation. 65 7.2.5 Computing IGRF values for profile data. 66 7.3 Profile position operations. 68 7.3.1 Simple shift. 68 7.3.2 Spline smooth. 69 7.3.3 Shift / dragging along profile. 70 7.3.4 Using line shift file . 71 7.3.5 Dragging method details. 72 7.4 Splitting profile lines in-place . 73 7.5 Profile data export. 79 8 Removing polynomial background for profiles and grids 81 8.1 Grid operation. 82 8.2 Profile operation. 83 9 Leveling magnetic profile data with tie lines. 84 9.1 Notes of the method implementation. 84 9.2 Leveling operation. 86 10 Quasi-Analytic signal 91 10.1 Brief introduction to the Analytic Signal . 91 10.2 How quasi-analytic signal is computed in MagPick. 94 11 Simple magnetic anomaly positioning. 97 11.1 Convert picks into “targets” (grid operation) . 97 11.2 Picking targets directly from profile lines. 99 12 Coordinate transformations 101 12.1 Basics . 101 12.2 Coordinate systems in MagPick: details . 102 12.3 Locally rotated coordinate system . 103 12.4 Using built in UTM transformation . 104 2 12.5 Using projections provided by PROJ library . 107 12.6 Defining projections with PROJ command-line . 110 12.6.1 Typical usage . 111 12.6.2 Typical parameters used with +from and +to statements . 111 12.6.3 Example: Louisiana South NAD 27, in US survey foot . 113 12.6.4 California Zone 2 NAD 83, in US survey foot . 114 12.6.5 Example: ED50, Europe common offshore, UTM Zone 31N . 114 12.6.6 Example: Gauss-Kruger zone 9 Pulkovo 42 (North Caspian Sea) with 7- parameters . 114 12.6.7 Example (advanced): from built-in UTM to State Plane . 115 12.6.8 Example (advanced): Load from State Plane, process in UTM, save in WGS84 Lat/Lon . 115 13 UTM / Gauss-Kruger transformation in magpick (OBSOLETE) 115 14 Earth’s magnetic field model (IGRF). 118 15 Potential field transformations. 119 15.1 Upward continuation . 119 15.2 Synthetic horizontal and vertical gradients. 119 15.3 Reduction to the magnetic pole and pseudo gravity transformation . 120 16 Estimation of magnetic sources. 122 16.1 Magnetic modelling based on grid data. 122 16.2 Magnetic modelling based on profile data. 125 16.3 Magpick worksheet - results of inversions. 127 16.4 Option of mass estimation . 128 16.5 Automatic estimation of magnetic sources. 128 17 Implementation of the inversion in magpick 129 17.1 Solution of forward problem. 129 17.2 Basic inversion . 130 17.3 Estimation of susceptibility and remanent magnetisation . 131 17.4 Mass estimation. 131 18 Export to the CAD, Google Earth, printing, bitmap formats and including into MS Word and OpenOffice 132 18.1 Export to the AutoCAD(TM) and compatible software via DXF file . 132 18.2 Export to Google Earth™ . 137 18.2.1 MagPick Image Overlay. 139 18.2.2 Profile Locations. 140 18.2.3 Estimated dipole locations. 141 18.2.4 Manual target locations . 142 18.2.5 Additional drawings: lines and polygons. 142 18.2.6 Additional drawings: points. 143 18.3 Export into BMP file . 144 18.4 Export into TIFF and GeoTIFF formats. 144 18.4.1 Saving profile windows into TIFF. ..
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