+Maerthen Posted December 28, 2009 Share Posted December 28, 2009 I got a puzzle with 4 waypoints. When you draw a line from 1 WP to another for example west to east. And then you draw a line from a second WP to another for example north to south. You get a cross. My question: Is there a way to calculate where the lines meet? Quote Link to comment
+StarBrand Posted December 28, 2009 Share Posted December 28, 2009 I'd just look at the map. Quote Link to comment
+2beabout Posted December 28, 2009 Share Posted December 28, 2009 (edited) If they run east-west, and north-south, it would be the north from the east-west line, and the west from the north-south line. Other configurations would be different, requiring some averaging and possibly additional information. edit for grammar Edited December 28, 2009 by 2beabout Quote Link to comment
+Prime Suspect Posted December 29, 2009 Share Posted December 29, 2009 Best solved by just creating a point-to-point route in your GPS, then just go to where the route lines meet on the map display. Quote Link to comment
+fizzymagic Posted December 29, 2009 Share Posted December 29, 2009 I got a puzzle with 4 waypoints. When you draw a line from 1 WP to another for example west to east. And then you draw a line from a second WP to another for example north to south. You get a cross. My question: Is there a way to calculate where the lines meet? Yes, there are several ways to do it. Depends primarily on how far apart the waypoints are. If they are within a few miles, I would convert them to UTM and do a simple intersection of lines. Further apart, it gets a little trickier. A few weeks ago I described an iterative method for solving trilateration problems like this. You can do the same thing for this problem, though the exact steps are slightly different. Quote Link to comment
+Maerthen Posted December 30, 2009 Author Share Posted December 30, 2009 Thank you for you're help. I got some good tips. Should help a newbie like me Quote Link to comment
+akohout Posted January 4, 2010 Share Posted January 4, 2010 Thank you for you're help. I got some good tips. Should help a newbie like me Hello, why don't you use geogebra? It calculates the point exactly for you. Regards Andreas Quote Link to comment
+fizzymagic Posted January 5, 2010 Share Posted January 5, 2010 Thank you for you're help. I got some good tips. Should help a newbie like me why don't you use geogebra? It calculates the point exactly for you. Geogebra does plane geometry, not geodesy. It will work OK if the points are not very far apart. Quote Link to comment
+GeePa Posted January 5, 2010 Share Posted January 5, 2010 (edited) If you can manage to convert it into two points with bearing to the two others then you could try this site: Points of Intersection from Two Bearings This site will get you the bearing between two points: Calculate distance and bearing between Points Note: Edited to add bearing calculator link Edited January 5, 2010 by GeePa Quote Link to comment
+In Need of Cache Posted January 5, 2010 Share Posted January 5, 2010 You could put something like that in ArcGIS as well, just make sure you are using the same datum on your maps, gps and geocaching page Quote Link to comment
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