Parameter Summary

This topic is part of the Grade Estimation range of topics.

A summary of all parameters is given in the following table. All parameters are optional, and if not specified will take their default values:

ESTIMA - Summary of Parameters

Parameter

Default

Method(s)

Description

XSUBCELL

1

All

Number of subcells in X if &PROTO is empty

YSUBCELL

1

All

Number of subcells in Y if &PROTO is empty

ZSUBCELL

1

All

Number of subcells in Z if &PROTO is empty

DISCMETH

1

IPD, OK, SK

Cell discretisation method:

  • 1=use @XPOINTS etc

  • 2=use @XDSPACE etc

XPOINTS

1

@DISCMETH=1

Number of discretisation points in X

YPOINTS

1

@DISCMETH=1

Number of discretisation points in Y

ZPOINTS

1

@DISCMETH=1

Number of discretisation points in Z

XDSPACE

1 pt at cell centre

@DISCMETH=2

Distance between discretisation points in X

YDSPACE

1 pt at cell centre

@DISCMETH=2

Distance between discretisation points in Y

ZDSPACE

1 pt at cell centre

@DISCMETH=2

Distance between discretisation points in Z

PARENT

0

All

Parent cell flag:

  • 0=estimate individual cells

  • 1=parent, all disc.pts

  • 2=parent, select disc.pts

MINDISC

1

@PARENT=2

Minimum number of discretisation points

XMIN

&PROTO min X

All

Minimum X value for model updating

XMAX

&PROTO max X

All

Maximum X value for model updating

YMIN

&PROTO min Y

All

Minimum Y value for model updating

YMAX

&PROTO max Y

All

Maximum Y value for model updating

ZMIN

&PROTO min Z

All

Minimum Z value for model updating

ZMAX

&PROTO max Z

All

Maximum Z value for model updating

COPYVAL

0

All

Copy flag:

  • 0=absent data in insufficient data

  • 1=copy existing value(s) to Output Model

FVALTYPE

1

OK, SK

F value approximation:

  • 1=use exact cell dimensions

  •  2=approximate cell dimensions

FSTEP

1

@FVALTYPE=2

Step size for cell approximation for F value

LINKMODE

3

Unfold

Method of defining string linking

UCSAMODE

2

Unfold

The type of UCSA coordinate

UCSBMODE

3

Unfold

The type of UCSB coordinate

UCSCMODE

2

Unfold

The type of UCSC coordinate

PLANE

1

Unfold

The plane of the structural interpretations

HANGID

-

Unfold

The value of hangingwall field in &STRING file

FOOTID

-

Unfold

The value of footwall field in &STRING file

TOLRNC

0

Unfold

Tolerance in the calculation of UCSA coordinate

ORGTAG

-

Unfold

Tag number defining origin of UCSB axis

PRINT

0

All

Flag controlling quantity of displayed output:

  • 0=minimum

  • 1=medium

  • 2=maximum

ECHO

0

All

Flag controlling output sent to print file:

  • 0=do not send to file

  • 1=send to file

Files and Fields

A summary of all the files used by ESTIMA is given in the following table:

File Name

Input/Output

Mandatory/Optional

Description

PROTO

I

M

Input prototype model

IN

I

M

Sample data file

SRCPARM

I

M

Search volume parameter file

ESTPARM

I

M

Estimation parameter file

VMODPARM

I

O

Variogram model parameter file

STRING

I

O

Unfolding strings file

MODEL

O

M

Output model

SAMPOUT

O

O

Sample output file
 

Most of these files have been described in detail in the previous sections. A brief description of the Input Prototype Model and Sample Data files is given here:

Input Prototype Model

This is a standard Datamine model file containing the 13 compulsory fields. In addition it may contain the following three fields:

  • LOCALM_F: the local mean for simple kriging

  • ZONE1_F: first field for zonal control

  • ZONE2_F: second field for zonal control

Sample Data File

This file must contain the X, Y and Z coordinates of the samples, and at least one grade field.

ESTIMA expects the names of the coordinate fields to be X, Y and Z. However, if other names have been used then they can be specified, for example:

*X(EAST), *Y(NORTH), *Z(RL)

The name(s) of the grade field(s) are defined using the fields VALUE_IN in the Estimation Parameter file. The other fields (all optional) in the Sample Data file are:

  • ZONE1_F: first field for zonal control

  • ZONE2_F: second field for zonal control

  • KEY: field used to restrict samples per keyfield

  • LENGTH_F: field for Inverse Power Distance length weighting

  • DENS_F: field for Inverse Power Distance density weighting

These fields are specified in the same way as specifying coordinates e.g. *KEY(BHID).

However, please note that if there was a field named KEY in the Sample Data file and MAXKEY was set to 1 or more in the Estimation Parameter file, then the process would use the field KEY for restricting samples even if *KEY(KEY) was not specified.

A similar situation to the KEY field example applies to the other fields, which is why they have been given names which are unlikely to occur in normal use.

Summary of Fields

ESTIMA uses the standard Datamine field naming conventions. The fields which are prompted for are shown below. Note that all fields are optional:

Parameter

Default

Method(s)

IN

X

X coordinate of sample data

Y

Y coordinate of sample data

Z

Z coordinate of sample data

KEY

Key field used to restrict samples for estimation

LENGTH_F

Field used for length weighting for IPD

DENS_F

Field used for density weighting for IPD

IN, PROTO, MODEL, ESTPARM

ZONE1_F

First field for zonal control

ZONE2_F

Second field for zonal control

STRING

SECTION

Section identifier for unfolding

BOUNDARY

Boundary identifier for unfolding

WSTAG

Within section tag

BSTAG

Between section tag

TAG

Tag field