Select slope method

You use this function to view and alter the method that Surpac uses to determine the slope angle of a pit when expanding segments.

To run this function: Choose Design > Pit design > Select slope method, or...

In the Function Chooser, type DESIGN SLOPE METHOD, and press ENTER.

The expansion functions on the Pit design menu, for both strings and segments, use one of several methods to determine the slope angle used when expanding the strings or segments. The methods available are design slope, descriptions, slope strings, and block model.

Fields on the Design slope angle method form

Field	Description
Define slope angle using	The methods available to determine slope angle. design slope: This is the default method. This method gets the slope angle from the design gradient. You can change the design gradient using DESIGN GRADE. descriptions: This method gets the slope angle from the D1 field of each point in the segment. This allows for considerable variation in slope angles with minimal effort to create different slope zones. Another advantage to this method is that the slope angles are copied to the D1 field of points in new segments created using the pit design expansion functions. Note: Angles stored in the D1 field of the points must be in decimal degrees. If any point in a segment has a non-numeric value, or no value, in the D1 field, the design gradient is used. slope strings: This method gets the slope angle for each point in a segment using the D1 field of the slope string that encompasses the point in question. To use this method, you must load a slope string. If no slope string is loaded or a point is not encompassed by the slope string, the design slope method is used. Note: Angles stored in the D1 field of the points must be in decimal degrees, and be within the range 0.1 to 89.9. If any point in the slope string segment has a non-numeric value, or no value, in the D1 field, the design gradient is used. block model: This method is only available if a block model is loaded. When you select this method, the slope angle for each point is taken from an attribute stored in the block containing the point. You specify the attribute using the Slope angle attribute field on this form. If any point in a segment is outside the block model extents, the background value for the attribute is used. Note: Values stored in the slope angle attribute must be numeric and in decimal degrees.
Slope angle attribute	The attribute, in the block model, that contains the slope angle. The values for slope angle must be in decimal degrees.

Field

Description

Define slope angle using

The methods available to determine slope angle.

design slope: This is the default method. This method gets the slope angle from the design gradient. You can change the design gradient using DESIGN GRADE.
descriptions: This method gets the slope angle from the D1 field of each point in the segment. This allows for considerable variation in slope angles with minimal effort to create different slope zones. Another advantage to this method is that the slope angles are copied to the D1 field of points in new segments created using the pit design expansion functions.

Note:

Angles stored in the D1 field of the points must be in decimal degrees.
If any point in a segment has a non-numeric value, or no value, in the D1 field, the design gradient is used.

slope strings: This method gets the slope angle for each point in a segment using the D1 field of the slope string that encompasses the point in question. To use this method, you must load a slope string. If no slope string is loaded or a point is not encompassed by the slope string, the design slope method is used.

Note:

Angles stored in the D1 field of the points must be in decimal degrees, and be within the range 0.1 to 89.9.
If any point in the slope string segment has a non-numeric value, or no value, in the D1 field, the design gradient is used.

block model: This method is only available if a block model is loaded. When you select this method, the slope angle for each point is taken from an attribute stored in the block containing the point. You specify the attribute using the Slope angle attribute field on this form. If any point in a segment is outside the block model extents, the background value for the attribute is used.

Note: Values stored in the slope angle attribute must be numeric and in decimal degrees.

Slope angle attribute

The attribute, in the block model, that contains the slope angle. The values for slope angle must be in decimal degrees.

Output

The method for determining slope angle is set to the method you selected. The expansion functions on the Pit Design menu will use this method. When you close Surpac the method is reset to the default, design slope.