I run the transect tool with 90 degree required parameter to draw perpendicular lines from a line. I got the output but when I measured the angle it is not showing as 95 degree.

What will be the error?

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    Do you use a projected CRS? – Babel Apr 24 at 15:24
  • The working in GCS and I didn't project anything. Could it be the error? – Gokul Anand Apr 24 at 15:26
  • In which CRS is your line? – Babel Apr 24 at 15:30
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    Hi, just checked with PCS now I am getting perpendicular lines. Earlier it was in 4326. – Gokul Anand Apr 24 at 15:37
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    Projected Coordinate System – Gokul Anand Apr 24 at 15:43

If your layer is in a geographic CRS ( coordinate reference system) like EPSG:4326, reproject it to a projected CRS like EPSG:3857.

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    Web Mercator is safe for angles, but not distances, so I'd be careful recommending it without a caveat. – Vince Apr 24 at 17:29
  • @Vince Would a UTM projection be better in this case? – wingnut Apr 24 at 17:31
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    @wingnut It depends on the extent; a custom equal-area projection might be a better fit (if there isn't a ready-made one available) – Vince Apr 24 at 17:36

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