GM-SYS 3D Modelling

The GM-SYS 3D Modelling system is a 3D gravity and magnetic modelling package for surface-oriented models. A model is defined by a number of stacked surface grids with density, susceptibility and remanent magnetization distributions specified for the layer below each surface.

Calculations are performed in the wave number domain, and are based on Dr. Bill Pearson’s implementation of R. L. Parker’s algorithm (1972). The program is designed to run within Oasis montaj, making available all of the familiar grid manipulation and display routines in addition to application-specific routines.

Working in Oasis montaj requires a Project (*.gpf) . A project encompasses every item in your workspace, from the data files in your project (e.g., databases, grids, maps, voxels, geosurfaces, 3D views, etc.) to the tools used (histograms, scatter plots, etc.) and the project setup including the menus you have displayed.

To start working with the GM-SYS 3D Modelling extension, we recommend that you open a new project and then load the GM-SYS 3D Modelling related menus.

Open a new project:

1. On the Project menu select New. The New Project dialog opens.

   You can also select the Create new project option on the startup dialog, which is displayed when you launch Oasis montaj.

2. In the New Project dialog, specify the name and location of your new project file (*.gpf) and click the Save button.

3. The new project is opened, which enables the main menus, the icons on the main toolbars, and the Project Explorer. These visual clues indicate that you are ready to start working with the system.

Load the menu(s):

1. On the Project menu select Manage Menus, or click the Manage Menus icon on the Project Explorer toolbar. The Manage Menus dialog appears.

2. Expand the Extensions node, select the GM-SYS 3D Modelling entry and click OK. The GM-SYS 3D related menus will appear on the main menu bar.
   The menu system has been structured to enable you to quickly access a variety of tools and to provide an easy-to-use workflow to lead you through the main processing and filtering functions you can perform with the extension.

Once you have loaded the menu(s), you will have access to the GM-SYS 3D Modelling Help by clicking on the Help button on any of the dialogs:

• The reference Help topic for the dialog of interest will appear.

• You can navigate to another topic of interest from the Help Topics tab.

• You can search for a specific topic by typing in keywords in the Search tab.