Set Attribute by Grid File

This command assigns an attribute value such as thickness or BTU to a panel or pit area based on the average value from a grid file. The program prompts for the attribute name and the grid file that represents the attribute. Then multiple panel/pit perimeter polylines can be selected and the program calculates the average grid value in each panel/pit polyline and stores this value.

Another method for using grids is to define the attribute as the actual grid file name instead of the average value. Then the timing routines will calculate attribute values for each timing block from the grid value. The advantage to using Set Attribute by Grid File instead of using the grid file is speed.

The Calculate Seam Split Quantities option is for calculating coal and rock thicknesses by analyzing multiple strata elevation grids using minimum and maximum miner heights. When the coal thickness is less than the minimum height, the minimum height is used. The maximum height is used when the coal thickness is greater than the maximum height. A fixed amount of rock thickness that is always taken can be specified. Given the miner height, the program will find when the miner takes main coal seam plus the parting and any of the second coal seam. The average coal and rock thickness for each panel polyline is calculated and stored.

Prompts

Type of polylines (<Underground>/Surface)? press Enter
Calculate seam split quantities (Yes/<No>)? press Enter
Attribute Name: BTU
Select Grid File dialog
Select panel polylines.
Select objects: pick the panel perimeter polylines

Pulldown Menu Location: AdvMine
Keyboard Command: gridattr