This command merges two elevation grid files and outputs the result to a new grid file. The purpose of this command is to "pancake" together the top and bottom elevation grids for a strata so that the thickness is zero in specified areas. The two input elevation grid files should have the same grid position and resolution. One represents the top of strata elevation and the other represents the bottom elevation. The output grid will have the top grid elevations except in areas of zero thickness where the output grid will have the bottom grid elevations. This output grid can then be used as the new modified top elevation grid. StrataCalc routines will have the same elevation for the top and bottom of the strata in the areas of zero thickness.
After prompting for the grid file names, the program prompts for the inclusion and exclusion polylines. These should be closed polylines where everything inside the inclusion polylines and outside the exclusion polylines has zero thickness. For example, you can draw a closed polyline for an inclusion area around an area where the strata pinched out, where you want it to be zero, or has already been mined.
Select TOP Elevation Grid File dialog
Select BOTTOM Elevation Grid File dialog
Specify New Elevation Grid File dialog
Specify inclusion and exclusion areas for zero thickness.
Select the Inclusion perimeter polylines or ENTER for none:
Select objects: select a closed polyline
Select the Exclusion perimeter polylines or ENTER for none.
Select objects: press Enter
Pulldown Menu Location: StrataCalc
Keyboard Command: mergegrd2