
Topology Topology Math Forum 
 LinkBack  Thread Tools  Display Modes 
July 17th, 2018, 07:43 AM  #1 
Newbie Joined: Jul 2018 From: earth Posts: 1 Thanks: 0  projecting a square on an equirectangular map
First time posting... let me know if this is the wrong place. So I am trying to program a 360 equirectangular image viewer, but I can't quite work out the math. The goal is to project a square (the screen's view) onto the equirectangular image to work out what each pixel of the screen would see. If something like this has already been posted, please link to it. Last edited by skipjack; July 22nd, 2018 at 08:08 AM. 
July 22nd, 2018, 05:50 AM  #2 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,261 Thanks: 896 
An "equirectangular map" (also called a "Mercator map") is a mapping from a sphere onto a plane. So are you talking about a "square" on a sphere? Of course, it is impossible to have a true square on a sphere! Exactly what do you mean? Or do you mean the inverse map, from the plane to the sphere so that a square in a plane is being mapped to a sphere? Does this help? https://en.wikipedia.org/wiki/Equire...lar_projection 

Tags 
equirectangular, map, projecting, square 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Projecting convex polyhedra onto 2d  Loren  Geometry  2  January 24th, 2017 01:13 AM 
square root of 15 square plus 15 square  richardz03  Elementary Math  3  December 21st, 2014 07:03 AM 
Prove that n is a square or doubled square  Lukaszm  Algebra  4  October 1st, 2012 11:06 PM 
Projecting 2D onto 3D Surface  omorawr  Linear Algebra  1  August 12th, 2011 06:57 AM 
Square Root and Square Problem  jared_4391  Algebra  3  August 8th, 2007 10:06 AM 