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SLIPER - intersect parallel perimeters by orthogonal planes

 

Process Name

Menu Path

Link to Command Table

SLIPER

Command line only

Click here

 

Introduction

Intersects a set of parallel perimeters by a set of orthogonal planes.

How to use

This process produces two optional output files:

  1. An intersection file, containing the co-ordinates of the end points of the line describing the intersection of each plane and the perimeters.

  2. A perimeter file, connecting the co-ordinates of the intersections in the form of a standard perimeter.

The input perimeters may be parallel to any one of the three co-ordinate axes, and the intersection plane will be perpendicular to the input perimeter.

For example, Figure 1 shows a set on input perimeters representing the plan outline of a particular rock type on 4 benches. These perimeters are intersected by 2 north-south planes. The output intersections file contains 7 fields - the X, Y and Z co-ordinates of the 2 end points (X1, Y1, Z1 and X2, Y2, Z2) and a perimeter value field containing the PVALUE of the original perimeter. In the example of Figure 1 the file will contain 7 records, one for each of the intersection lines P1P2, P3P4, .... P13P14. The X1 and X2 values will be northings, Y1 and Y2 the elevations, and Z1 and Z2 the easting of the intersection plane. The PVALUE for intersection line P1P2 is 10.

The intersection lines for any intersection plane can be plotted by using the PLOTLN process under the retrieval criteria that ZP is equal to the section co-ordinate . In this example the retrieval criteria would be for the easting (ZP) value. Each intersection line can be annotated with the original PVALUE using the PLOTAN process. In this way it is possible for the input perimeter file to contain several perimeters for each bench, representing different rock types, with the PVALUE field containing a rocktype identifier. Using PLOTLN and PLOTLN as described above it would be possible to distinguish between intersection lines for the different rock types.

The output perimeter file is a standard perimeter containing fields XP, YP, ZP, PTN and PVALUE. In the example of Figure 2, the output perimeter file would contain two perimeters. The first perimeter would have eight points ordered P1, P3, P5, P7, P8, P6, P4, P2 and with both ZP and PVALUE equal to the section easting. If the input perimeter contains a re-entrant, or there are multiple perimeters on a single bench, then the output perimeter will describe the outermost points of the intersections of any line.

For example in Figure 2 the output perimeter would be P1, P3, P7, P10, P6, P2.

Files, Fields and Parameters

Input Files

Name

Description

I/O Status

Required

Type

PERIMIN

Input perimeter file containing at least 2 perimeters. This must be in standard DATAMINE format [XP,YP,ZP,PTN,PVALUE, all numeric and explicit] with XP and YP variable and ZP fixed for each perimeter. The file must contain at least two perimeters with different ZP values.

Input

Yes

String

Output Files

Name

I/O Status

Required

Type

Description

INTERSEC

Output

No

Undefined

An optional output intersections file containing the coordinates X1,Y1,Z1 of the end points of each intersection line, and the PVALUE of the intersected perimeter. At least 1 output file must be specified.

PERIMOUT

Output

No

String

An optional output perimeter file in standard datamine format containing the intersection perimeters. At least 1 output file must be specified.

Parameters

Name

Description

Required

Default

Range

Values

MODE

 

Option

Description

1

FOR A PLAN TO NS CONVERSION.

2

FOR A PLAN TO EW CONVERSION.

3

FOR A NS TO EW CONVERSION.

4

FOR A NS TO PLAN CONVERSION.

5

FOR A EW TO NS CONVERSION.

6

FOR A EW TO PLAN CONVERSION.

Yes

1

1,6

1,2,3,4,5,6

STARTPOS

Starting position for intersection planes.

Yes

Undefined

Undefined

Undefined

STEPSIZE

Interval between intersection planes.

Yes

Undefined

Undefined

Undefined

NUMSTEPS

Number of intersection planes.

Yes

Undefined

Undefined

Undefined

CLOSE

 

No

1

0,1

0,1

Notes

There is a limit of 1200 points in any single input or output perimeter, and a limit of 20 intersection lines, for the intersection of a single perimeter plane and an intersection plane.

Example

!SLIPER

&PERIMIN(PERIMS), &INTERSEC(INTERS), @MODE=3,
@STARTPOS=200,@STEPSIZE=10, @NUMSTEPS=11.

Figure 1



Figure 2

Error and Warning Messages

Message

Description

Solution

130,n,F,SLIPER

Input &PERIMIN file not specified.

 Define an &PERIMIN file.

 

 

 

131,n,F,SLIPER

Neither output file specified.

Optional.

 

 

 

132,n,F,SLIPER

Input &PERIMIN file does not exist.

Check that the specified &PERIMIN file exists and has been added to the project..

 

 

 

134,n,F,SLIPER

One or more of the compulsory fields XP, YP, ZP, PTN, or PVALUE are missing from the &PERIMIN file.

Check that the fields XP, YP, ZP, PTN, and PVALUE exist in the &PERIMIN file.

 

 

 

138,n,F,SLIPER

The number of points in one of the input perimeters exceeds the maximum of n.

Condition the &PERIMIN file and reduce the number of points per string.

 

 

 

139,n,F,SLIPER

One of the input perimeters is not sorted on the PTN field.

Sort the &PERIMIN file on the fields PVALUE and PTN

 

 

 

140,n,F,SLIPER

Error when reading &PERIMIN file.

Check the contents of the &PERIMIN file.

 

 

 

141,n,F,SLIPER

@MODE parameter not specified.

Select a @MODE parameter value.

 

 

 

142,n,F,SLIPER

@MODE parameter not in range of 1 to 6

Select a @MODE parameter value of 1, 2, 3, 4, 5, or 6.

 

 

 

143,n,F,SLIPER

@STARTPOS parameter not specified.

Select a @STARTPOS parameter value.

 

 

 

144,n,F,SLIPER

@STEPSIZE parameter not specified.

Select a @STEPSIZE parameter value.

 

 

 

145,n,F,SLIPER

@NUMSTEPS parameter not specified.

Select a @NUMSTEPS parameter value.