Min X, Min Y, Max X, Max Y:  Displays the coordinates of the shape of the output grid which will be created.  To set the extents, these fields may be edited, or the extents may be selected on the map.  The fields default to the smallest rectangle that contains all of the grids that will be merged.  The Max X and Max Y values will be changed when the column and row spacing is changed, to ensure that the grid edges contain data values.

Select From Map:Click Select From Map and then define the Min X, Min Y, Max X and Max Y extents by dragging our an area on the Basemap with the left mouse button depressed.

Restore Defaults:Changes the extents defined in Min X, Min Y, Max X, and Max Y to the smallest rectangle that contains all of the grids that will be merged.

Define column width and height: Select this option if you prefer to set the column width and row height by entering those values into the Width and Height fields.

Define number of columns and rows: Select this option if you prefer to set the number of columns and rows of data.  The width and height will be calculated based on the extents of the grid and the number of columns and rows.

Min X, Min Y, Max X, Max Y:  Displays the coordinates of the smallest rectangle that contains all of the grids that will be merged.

Min Width:Displays the smallest distance between the columns of all of the grids that will be merged.

Min Height: Displays the smallest distance between the rows of all of the grids that will be merged.

Max Width: Displays the largest distance between the columns of all of the grids that will be merged.

Max Height: Displays the largest distance between the rows of all of the grids that will be merged.

Polygons: Open the Select Polygons dialog and select inclusion or exclusion polygons to restrict the geographical extents of the grid merge. Only points within the constrained zone will be merged, and any points in the destination grid outside of the polygon constraints will remain unchanged.