I have a line between C1 and C2;

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My Coordinates are;

C1: 36.454N - 21.785E C2: 41.725N - 38.475E

I want to find C3 latitude value based on given longitude when I extend my C1-C2 line segment.

IE C3 Lng is 42.00E.

How can I find it? And I use EPSG:4326 as CRS.

  • Are you using a specific GIS software, or is this a theoretical question? – csk Jul 23 '18 at 17:35
  • I am using DotSpatial nuget package in my net.core project, but i will implement the theory in c# – Mapster Jul 23 '18 at 17:47

The answer is here

tan(c3Lat) = tan(MaxLat) * cos(c3Lon-c2Lon); 
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