Small Circles and Ellipses

Define small circles and ellipses

Functions

ellipse1Geographic ellipse from center, semimajor axes, eccentricity, and azimuth
gcxscIntersection points for great and small circle pairs
scircle1Small circles from center, range, and azimuth
scircle2Small circles from center and perimeter
scirclegSmall circle defined via mouse input
scircluiGUI to display small circles on map axes
scxscIntersection points for pairs of small circles
sectorgSector of small circle defined via mouse input

Topics

Small Circles

A small circle is the intersection of a plane with the surface of a sphere.

Generate Small Circles

This example shows how to generate and display a true small circle, a loxomdromic small circle, and the limiting case of a great circle.

Calculate Vector Data for Points Along a Small Circle

You can generate vector data corresponding to points along a small circle by using a center point and a point on the circumference, or a center point and a known radius.

Create Small Circle and Track Annotations on Maps Interactively

You can generate geographic line annotations, such as navigational tracks and small circles, interactively.

Calculate Intersections of Small Circles

This example shows to calculate the intersection of two small circles represented as vector data.