Boundary View

Boundary View is a means for viewing overlapping grids in order to enable their identification. The Boundary View representation of a grid replaces the non-null values along the grid edges with an integer (or index) that can be used to identify the grid, and fills the grid interior with a pattern of null and non-null index values as shown in the example below.

The GridMerge "Create Boundary View" utility (Utilities|Create Boundary View) will generate a boundary view for each grid in the input directory. These can then be merged (Grid Merge|Merge Grids) to produce a Boundary View grid for the project as shown below (left-hand panel). 

The utility also generates a Boundary View Information File, which contains the grid names, their associated index, and grid extents (of not-null values). Once the Boundary View Grid and its associated Information File are loaded on the Main Window (File|Load Boundary View Grid and File|Read Boundary View Info File), users can click on the fill pattern of the Boundary View (using Select Mode) to identify any particular grid.

Note that the Boundary View Grid (and its associated Information File) must be loaded from the File menu in order for this functionality to be activated. A Boundary View Grid can also be loaded using the LHS or RHS text box File Icon buttons on the Main Window. But in this case the grid identification functionality will not be available.

The format of the Boundary View Information File is simply a header line (consisting of the text string "BOUNDARY_VIEW_INFO_FILE") followed by one line for each grid containing the grid index, cell size, rows/columns, grid extents (for not-null values), and the grid name. For 4 grids, the file contents might look something like this:

 BOUNDARY_VIEW_INFO_FILE

     0   0.001000     788     608   132.947000   133.554000   -28.001000   -27.214000  mSA0718.ers 

     1   0.001000     637    1215   131.772000   132.986000   -28.730000   -28.094000  mSA0717.ers 

     2   0.000833    1208    1924   131.436606   133.039042   -29.926398   -28.920605  mSA1162.ers 

     3   0.000833    2593    5507   128.995213   133.583363   -29.069211   -26.909297  mSA1098.ers