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using QGIS 18.16 I am trying to figure out how to cal a reverse azimuth. Basically the opposite direction. So if i have a azimuth of 163, I subtract 180 which gives me -17. I some how need to write a script or a field calc to then , for only the '-', numbers subtract that number form 360. which would give me 343 as the reversed azimuth.

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    Can you specify what do you like to do (which software do you use)? – Moh May 17 '18 at 17:12
  • updated to state I am using QGIS 18.16 – lowsparked May 17 '18 at 17:24
  • Try if( "azimuth" < 180, "azimuth" + 180, "azimuth" - 180) – Kazuhito May 17 '18 at 18:03
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Try if( "azimuth" < 180, "azimuth" + 180, "azimuth" - 180)

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  • @user12577 - did this solution work for you? Helpful (and rewarding!) to click the 'accept' check mark when answers are successful! – Simbamangu Jun 6 '18 at 18:31

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