Create Best Fit Alignment Dialog Box

Use this dialog box to specify the settings to use when creating an alignment by best fit through a series of objects.

Input Data

Input Type

Specifies the type of source objects (AutoCAD Blocks, AutoCAD Elements, AutoCAD Points, COGO Points, or Feature Lines) from which to create the best fit alignment.

Weeding Options

Opens the Weeding Options dialog box, which enables you to specify options for adding or removing vertices when using either feature lines or AutoCAD elements as the input data.

Path 1

Specifies that the alignment is created through a single path of regression points.

Use this option to create an alignment from centerline sample data.

Path 2

Specifies that the alignment is created between two paths of regression points.

Use this option to create a centerline alignment between sample data of the either the edges of pavement of a road, or the left and right rails.

Best Fit Options

These options affect the manner in which the best fit algorithm is applied to the input data.

Maximum Radius For Curve Detection

Specifies the largest acceptable radius of curves that are created from the input data.

Note: This value is an estimate. For best results, specify a value that is slightly greater than the largest known radius in the input data.

Create Transitions

Specifies that transitions are created between the alignment straights and curves. The transitions on either side of a curve are symmetric unless the match straights option is selected.

Note: When this option is selected, the options below it become available.

Desired R/A For Transitions

Specifies the target R/A ratio for transitions that are created.

Create Transitions And Match Straights Where Possible

Specifies that the solution will follow the straights as much as possible. If no solution is available, then the straights are moved toward the circles until a transition solution is found between the straight and the curve.

Minimum R/A For Transitions

Specifies the minimum R/A ratio for transitions that are created. This value controls the length of the transitions:

• A higher value produces shorter transitions.
• A lower value produces longer transitions.

Creation Setting

Alignment Name

Specifies the name of the alignment. Each alignment must have a unique name.

Site

Specifies a site for the alignment. Select a site from the Site list, or enter a new site name.

Note: The default selection is <None>, which places the alignment in the top-level Alignments collection in Prospector. See About Alignment and Site Interaction for more information.

Alignment Style

Displays the current style. Click the arrow to select another alignment style.

Alignment Label Set

Displays the default alignment label set. Click the arrow to select another alignment label set.

Layer

Displays the layer on which the alignment object is created. Click the arrow to select another layer.

Show Report

Opens the Best Fit Alignment Report vista, which lists the results of the best fit regression, including the coordinates of each regression point.