The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Math Topics »

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: ellipse over 3d earth
Replies: 0  

Advanced Search

Back to Topic List Back to Topic List  

Posts: 3
Registered: 10/15/08
ellipse over 3d earth
Posted: Oct 15, 2008 9:54 AM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

I need equations for an ellipse that is over the earth to generate lat,long points in Google Earth.

I have the semiMajor,semiMinor, orientation and center lat/long points.

The equations I tried previously, I believe is for a flat surface and are not generating the correct points.

Here are the equations I'm using:

An ellipse rotated from an angle phi from the origin has as equation:

x= h + a cos( t) cos(phi) - b sin(t) sin(phi)
y = k + bsin(t)cose(phi)+ acos(t)sin(phi)

where (h,k) is the center, a and b the size of the major and minor
axis and t varies from -pi to pi.

Any help would be greatly appreciated.


Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.