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I have searched high and low and cannot figure out how to do this... I need to create a polygon based off a flight path, defined by radius to either side of the path. For example, if an airplane flies from Madrid, to Paris, then to London, I'll have a line with three points. I need to create a polygon around that line, extending out from either side of the line by a specified radius. Example: given the black line between the three cities, my polygon would be roughly what's shown in orange. Any suggestions on how I approach this? My end goal will be to find whether specific points exist within the polygon (which I know how to do).

Example

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    Modeling for flight path often includes slip space for course correction after turn (outside the turn, for a nautical miles or two). If you can construct the parallel lines (as great circle routes), constructing a polygon is just saving the vertices as a list and a stack, then appending the popped stack to the list.
    – Vince
    Commented Aug 15, 2022 at 21:33
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    Using what software?
    – Spacedman
    Commented Aug 15, 2022 at 21:48
  • I am not using a specific software app. Looking more for the algorithms. This logic is going into a custom application.
    – Steve
    Commented Aug 16, 2022 at 15:16

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Create a buffer around your line. Use Menu Vector > Geoprocessing Tools > Buffer (see screenshot below).

Be aware that you use a proper CRS - one that is appropriate to measure distances. UTM zone 30 N / EPSG:32630 might be a start, a custom CRS based on that even better.

enter image description here

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