This command creates a pattern of points in rows and columns using surface and bottom grids and dip direction. The options for this command are set in the dialog. Grid files for the ground surface and drill bottom are required. The Number By Row/Column option will number the holes by the hole row and column. Otherwise the holes are simply numbered sequentially. Up to four descriptions can be assigned to the holes such as pattern name, driller name, etc. The row and column distances can be specified separately. The drilling vertical angle can be set in the Vertical Dip field which is entered as an angle where 0 degrees is straight down and 90 degrees is horizontal. The Dip Direction defines the horizontal orientation of the vertical dip. The row and column directions are entered as bearing angles. You need to figure these angles before running Blast Pattern Layout by using routines such as Inverse or Bearing & 3D Distance.
This command can generate a report using the report formatter that lets you choose the fields for the report and the fields layout. The report formatter can also output to Excel and Access. The points can be also be stored to the current coordinate file (.crd). Then run Draw-Locate Points to draw the points created in the CRD file by Blast Pattern Layout.
After filling out the dialog, the program prompts for the blast boundary polyline which should be a closed polyline of the blast area. Finally you specify the starting point within this boundary polyline and the program calculates the points.
Blast Pattern dialog
Select blast boundary polyline: pick a polyline
Pick starting point: pick a point
Pulldown Menu Location: Surface
Keyboard Command: blast2
Prerequisite: Surface and pit grids
File Names: \lsp\blast2.lsp, \lsp\range.arx