Calculate an azimuth in degrees between two point locations

http://support.esri.com/index.cfm?fa=knowledgebase.techarticles.articleShow&d=15556

Summary
The sample script in this article measures the azimuth in degrees between two point locations.

Procedure

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Private Function ReturnAzimuth(pt1 As MapObjects2.Point, _

                               pt2 As MapObjects2.Point) _

                               As Double



'-- Enter two points.  Function returns the azimuth

'-- in degrees from Point 1 to Point 2.



  Dim x1 As Double, y1 As Double

  Dim x2 As Double, y2 As Double



  x1 = pt1.X

  y1 = pt1.Y

  x2 = pt2.X

  y2 = pt2.Y



  Select Case True

    Case ((x1 = x2) And (y1 < y2))

      ReturnAzimuth = 0

    Case ((x1 = x2) And (y1 > y2))

      ReturnAzimuth = 180

    Case ((y1 = y2) And (x1 < x2))

      ReturnAzimuth = 90

    Case ((y1 = y2) And (x1 > x2))

      ReturnAzimuth = 270

    Case ((x1 < x2) And (y1 < y2))

      ReturnAzimuth = 180 * ((Atn(Abs(x1 - x2) / Abs(y1 - y2))) / 3.14159)

    Case ((x1 < x2) And (y1 > y2))

      ReturnAzimuth = 180 * ((Atn(Abs(y1 - y2) / Abs(x1 - x2))) / 3.14159) + 90

    Case ((x1 > x2) And (y1 > y2))

      ReturnAzimuth = 180 * ((Atn(Abs(x1 - x2) / Abs(y1 - y2))) / 3.14159) + 180

    Case ((x1 > x2) And (y1 < y2))

      ReturnAzimuth = 180 * ((Atn(Abs(y1 - y2) / Abs(x1 - x2))) / 3.14159) + 270

  End Select



End Function

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