Questions tagged [great-circle]

Any line bisecting the surface of a sphere into two equal halves.

7 questions with no upvoted or accepted answers
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How to prevent cross-world lines in ggplot world map?

I'm having issues displaying 'great circles' paths and polygons in ggmap, an extension of ggplot2. Please enter the following code to replicate my issues: https://gist.github.com/Robinlovelace/...
3
votes
0answers
249 views

Which projection can I use to see alignments on great circles?

I want to put on a QGIS map some historical sites to check if they are aligned. If an alignement exists, the points should stay on a great circle (is this correct?). I want to visually verify this ...
2
votes
0answers
119 views

Great circle rendering of satellite ground tracks reversed in southern hemisphere

I'm working on rendering some satellite ground tracks from postgis, through geoserver, and onto openlayers. The python library I'm using to get lat, lon from TLE data isn't perfect, so there are ...
2
votes
0answers
274 views

Calculate Great Circle Distance between two point layers via way point

I need to create three distance matrices for around 550 points spread throughout Africa, Europe and Asia. The first matrix represents great circle distances, the second is the shortest distance along ...
2
votes
0answers
399 views

Air corridor in spherical surface: calculating great circle tangent points with small circles

I have the necessity to draw on a sphere (earth) an air corridor. In the cartesian plane, this corridor is made by some circles and from outer tangents that connect these circles as you can see in ...
1
vote
1answer
82 views

Distance between coordinates computation speed: conversion to UTM vs Great Circle

For a program I am writing I need to calculate the distances between coordinates. Seeing as I need to perform a large number of these calculations for each coordinate (thousands) it makes sense to ...
0
votes
0answers
38 views

Great circle distance vs. ellipsoidal model

Suppose I have a javascript function: sortByDistance( a, // Single point b, // List of points method // ellipsoidal or greatCircle ) { // Returns b, sorted closest to furthest from a }...