conpol

Process Help

CONPOL - create a convex polygon around X Y point data

Process Name	Menu Path	Link to Command Table
CONPOL	Data ribbon \| Data Tools \| 3D Utilities \| Convex Polygon	Click here

Introduction
Files, Fields and Parameters

Introduction

Create a convex polygon around an X,Y point data set.

How to use

To prevent large areas within the polygon having no data, a maximum chord length can be specified for the perimeter, so that the perimeter clings to the limits of the data creating a concave perimeter. The perimeter is established wih a PVALUE of 1.0, and a ZP value of 0.0. The standard perimeter file that is output will only have one perimeter.

Files, Fields and Parameters

Input Files

Name	Description	I/O Status	Required	Type
IN	Input file.	Input	Yes	Undefined

Output Files

Name	I/O Status	Required	Type	Description
PERIMOUT	Output	Yes	String	Output Perimeter file.

Fields

Name	Description	Source	Required	Type	Default
X	X coordinate field on input file.	IN	Yes	Numeric	Undefined
Y	Y coordinate field on input file.	IN	Yes	Numeric	Undefined

Parameters

Name	Description	Required	Default	Range	Values
MAXLEN	Maximum chord length, which should be greater than the distance between separate groups of data if all groups are to be included in the one perimeter and greater than the average point separation.	No	Undefined	Undefined	Undefined
EXTDIS	Distance to extend the perimeter (0).	No	0	Undefined	Undefined
CHECKDUP	Check for duplicate points in the input file. If this is turned on (set to 1) then processing takes much longer. For data sets with more than a few thousand points it is recommended that this is turned off (set to 1). Duplicate points can be removed from the input data file by using the FILTPO process before running CONPOL. =0 : Do not check for duplicate points - processing is much faster. =1 : Check for duplicate points.	No	0	Undefined	Undefined