Great Circle Line

Applicability:

• Cadcorp SIS Map Modeller
• Cadcorp SIS Map Editor
• Cadcorp SIS ActiveX Modeller

Ribbon Group:

Create-Advanced

Conditions for use:

• Item Class: LineString
• Minimum number selected: None
• Minimum item status: Editable

Associated commands:

• Ellipse
• Rectangle

Description:

 Great Circle Line creates a great circle line. This is a LineString item that takes into account the earth’s curvature.

The great circle line in the following illustration is being constructed between London and Sydney. 

The Great Circle Line command calculates the true path over the earth’s surface.

To create a Great Circle Line:

1. Select Great Circle Line
   
   
2. The Distance dialog is displayed:
   
   
   This value determines the length of each LineString item segment that will be created to represent the great circle line. For greater accuracy, choose lower values (shorter lengths).
   
   
3. Click to define the start position of the line. Temporary graphics show the great circle line being constructed. Click twice to define the end of the greate circle line.

Top of page AComGreatCircleLine

Send comments on this topic.

Click to return to www.cadcorp.com

© Copyright 2000-2017 Computer Aided Development Corporation Limited (Cadcorp).