The Grid

In order to build a contour map, a grid must be created and values interpolated into the grid nodes based upon the base data input. The methods of interpolating or assigning these values are covered in another chapter. When you first create a contour map, DISurf automatically creates and overlays an orthogonal 100 node x100 node grid sufficient to cover all datapoints. This default grid does NOT necessarily contain square nodes!

You may adjust or edit the grid by either clicking on Objects | Grid, or by clicking the Grid button on the Map Tree at the left of the map. A dialog box pops up giving you the option to make the grid finer, typically to obtain smoother contours, coarser, typically in order to run faster, or to define the grid with square cells. The length of a square cell side should be given units of X and Y.

Click the Advanced button to create an irregular grid or to save/load it.

If the Auto load box is checked, the grid is loaded from the directory when you open the data file in this directory (if the EqNet.net file was created in previous session).

The Show/Hide grid button in the toolbar panel shows or hides the grid. The grid parameters are automatically stored in the directory of input data (EqNet.net file).

By RIGHT CLICKING the Grid on the Map Tree, you will generate a CONTEXT MENU