WFTREND Process

To access this process:

Wireframe ribbon >> Process >> Wireframe Proceses >> Trend Surface.
Enter "WFTREND" into the Command Line and press ENTER.
Display the Find Command screen, locate WFTREND and click Run.

See this process in the Command Table.

Process Overview

Note: This is a superprocess and running it may have an effect on other Datamine files in the project.

This process creates a DTM wireframe surface which can be extended beyond the data limits by a specified distance using a planar trend surface.

The data limits are detected automatically and the trend surface is only used beyond the limits of the actual data. The input data is a set of points which should be sorted.

Input Files

Name	Description	I/O Status	Required	Type
POINTIN	Input point data file.	Input	Yes	Point Data

Output Files

Name	I/O Status	Required	Type	Description
WIRETR	Output	Yes	Wireframe Triangle	Output wireframe triangle file.
WIREPT	Output	Yes	Wireframe Points	Output wireframe point file.
POINTOU	Output	No	Point Data	Output point data file. This includes both the input point data, and the points which were extrapolated using the trend surface.

Fields

Name	Description	Source	Required	Type	Default
XPT	X field in input point data file.	POINTIN	Yes	Numeric	XPT
YPT	Y field in input point data file.	POINTIN	Yes	Numeric	YPT
ZPT	Z field in input point data file.	POINTIN	Yes	Numeric	ZPT

Parameters

Name	Description	Required	Default	Range	Values
EXTN	The extension distance required beyond the data points for the triangulation.	Yes	Undefined	0.1,+	Undefined
GRIDINC	Grid interval for the interpolated points beyond the limits of the original point data.	Yes	Undefined	0.1,+	Undefined
TR	Flag to indicate whether the field in the wireframe triangle file should have different values depending on whether or not the triangle is in the extrapolated area: 0 = all triangles have colour defined by parameter 1 . 1 = triangles in the area covered by POINTIN data are coloured 1 and those in the extrapolated area are coloured 2.	No	0	0,1	0,1
1	Colour field for the output points and wireframe triangles for data lying within the area covered by POINTIN data.	No	1	1,64	Undefined
2	Colour field for the output point data file for data points which have been extrapolated. If parameter TR is set to 1, then triangles in the extrapolated area will also have this colour; otherwise they is 1. If the parameter 2 is undefined then it is set equal to 1.	No	Undefined	1,64	Undefined