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I think azimuths are probably not a big deal but I've been trying to figure out how to calculate them and somehow I keep getting confused.

I have a few images of a vehicle from different angles. (Shown at the bottom of this post). In layman's terms I can just say that:

  • image 1: view from the back of the car (0 degrees). we'll refer to this image in the other images below...
  • image 2: now the car has moved 45 degrees to the right from previous position, so it's a total of 45 degrees from image 1
  • image 3: now the car has moved 45 degrees to the right from previous position, and a total of 90 degrees from image 1
  • image 4: now the car has moved 45 degrees to the right from previous position, and a total of 135 degrees from image 1
  • image 5: now the car has moved 45 degrees to the right from previous position, and a total of 180 degrees from image 1

and so on...

Now, in the first image, the vehicle is pointing straight ahead (let's assume this is north). So if I assume it's pointing to north, then my question is, what are the "azimuths" for these angles? Will they simply be 0, 45, 90, 135, 180, and so on?

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1 Answer 1

up vote 2 down vote accepted

First thing to notice: your text speaks of $30°$ increments, but the pictures seem to be taken from angles differeing by $45°$, since the third picture is already a straight side view of the car.

Your question “what are the "azimuths" for these angles” is confusing (or confused?). An azimuth is an angle, usually the angle between due north and the direction of some imagined ray, e.g. the ray along which a person is looking. I assume you want the azimuth of the direction where the camera is pointing.

That would indeed change in $45°$ increments (or $30°$ if you go by the text not the pictures), starting at $0°$ since it started out pointing north. The only thing that remains is getting the sign straight. Usually you have azimuth increasong from north to east, with $90°$ corresponding to due east, so if you move around your car in a clockwise fashion, your viewing azimuth would increase. Your sequence however is counter-clockwise, therefore you'd have azimuths $0°, -45°, -90°$ and so on, or equivalently $0°, 315°, 270°, \dots$.

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thanks! yes that was a mistake, it should have said it's incrementing by 45 degrees, not 30. –  user961627 Dec 19 '13 at 15:23

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