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I'm trying to use fixed distance buffer, and had a few questions. One, what units is the distance being measured in? I assumed meters, but after doing a test run it clearly isn't. And two, what is "Segments"? I checked the documentation, and it doesn't give any hints about either (I think this part of the documentation was never finished)

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marked as duplicate by Ian Turton May 18 '18 at 6:16

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The units depend on your layer CRS. You used a WGS84 layer, so the units are degrees. The segments-value is the number of segments used to approximate a quarter circle.

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