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Where is the Angle Measure Tool in ArcMap 10?

I can't seem to find it.

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1… – whuber Oct 22 '10 at 17:05
up vote 5 down vote accepted

alt text You mean this? Select, and then tap in angle, as per what u did in 931? Can still do direction/length in combo as well. Let me know if this is not what ur after

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This Python script tool will do the trick. To use it, add it as a script tool, set the parameter to Feature Set - and set its schema to a line feature class. This script should work with 10.0 and later.

# calculate an azimuth angle from a interactively entered
# line (feature set)
# Curtis Price,,  9/18/2013 11:51:10 AM

import math
import arcpy

# read line (This parameter should be a line feature set)
line = arcpy.GetParameterAsText(0)

# to see how this is used, see the help:

def get_angle(xy1, xy2):
  """Calculate azimuth angle from two points. (Zero is north.)"""
  import math
    # ArcPy point objects
    x1, y1, x2, y2 = xy1.X, xy1.Y, xy2.X, xy2.Y
    # xy strings, e.g. "0 0"
    x1, y1 = [float(x) for x in xy1.split()]
    x2, y2 = [float(x) for x in xy2.split()]
  dx, dy = (x2 - x1, y2 - y1)
  return 90 - math.degrees(math.atan2(dy, dx))

  # get first and last point of a line
  SHAPE = arcpy.Describe(line).shapeFieldName
  Rows = arcpy.SearchCursor(line,"","",SHAPE)
  feat =
  pt1 = feat.firstPoint
  pt2 = feat.lastPoint
  angle = get_angle(pt1, pt2)
  msg1 = "  First point: {0:.1f}, {0:.1f}".format(pt1.X, pt1.Y)
  msg2 = "  Last point:  {0:.1f}, {0:.1f}".format(pt2.X, pt2.Y)
  msg3 = "  Azimuth angle (in degrees): {0:.1f}".format(angle)
  arcpy.AddMessage("{0}\n{1}\n{2}".format(msg1, msg2, msg3))
  raise Exception, "Invalid line input"
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In ArcGIS 10.1 and later, there is a tool called COGO - located in the Editor Toolbar/More Editing Tools/COGO. On the tool bar there is a button called Reporting COGO descriptions. This reporting tool has a feature called "Angle between two lines" which reports the angle between 3 points on a line.

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Thanks a million. You saved the day... – jonatr Aug 6 '15 at 11:53

Without even being sarcastic, for most tasks I use a simple set square / triangle and measure directly on the screen. Quick and dirty solution that works just fine.

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Clarifies @TvsGIS' answer. In ArcMap 10.3 use COGO toolbar, select COGO Report (7th button from left) then select "COGO description of an existing feature" (2nd from right : arrow pointing to middle of a line). Then click on line feature. This gives the angle and length in Grid (Map) and Ground (survey measurements) co-ordinates. The transform from Grid to ground is the ADD Direction Offset and divide by Distance Factor of Editing Options > Units > dialog.

If you use "Direction and Distance of a line" (1st button on left), then interactively select start and end points of the line. The angle is from your start point to your end-point. However the line segment may be draw in the opposite direction.

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