[gdal-dev] How to calculate total change in headings?

[Roger André]

Hi all,

Not a GDAL question at all, but one which might amuse some of you, and which
has been unsolveable in a satisfactory fashion for me.

Given a list of compass headings in degrees, how can you reliably calculate
the total change in direction?

Here's an example:  [355.5, 10.0, 5.1]

This seemed like a simple thing to figure out, but seems to be more
complicated than I had originally thought.

Roger
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