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Help me understand Surveyor's Unit angles. Please.

ballch49ZUG
Contributor

Help me understand Surveyor's Unit angles. Please.

ballch49ZUG
Contributor
Contributor

For example, I have a site plan. the boundaries starting at 0,0 are as follows:

161.83' < N0d41'E - No problem

263' < S89d54'30"E - No problem

43' < S30dE - UH OH. This line should go down and to the right. Instead, it goes up and to the right. If I move the mouse curser to the right on the 0 angle, the line is drawn correctly. If I move the mouse curser to down at any angle, the line is drawn to the right and up. If I move the mouse curser to the up at any angle, the line is drawn correctly.

 

Why is this the case?

 

Edited to add the "d" in S30dE

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Respuestas (12)

Patchy
Mentor
Mentor

43' long starting from the south goes 30 degrees counter-clockwise to the east.

Line enter

@Anonymous<s30de

jayhar
Advisor
Advisor

Surveyor's Unit angles, also known as azimuth angles, are a way of representing directions or bearings in land surveying. They are typically expressed in degrees, minutes, and seconds (d° m' s"). In your example, the angles you provided are expressed in this format. Let's break down the angles to understand them better:

 

1. 161.83' < N0d41'E: This angle represents a bearing of N0°41'E. It indicates a direction that starts from the reference point (0,0) and goes towards the north at an angle of 0 degrees and 41 minutes east of north.

 

2. 263' < S89d54'30"E: This angle represents a bearing of S89°54'30"E. It indicates a direction that starts from the reference point and goes towards the south at an angle of 89 degrees, 54 minutes, and 30 seconds east of south.

 

3. 43' < S30E: This angle is a bit different and seems to be causing confusion. The format is slightly unusual, but it suggests a bearing of S30°E. This indicates a direction that starts from the reference point and goes towards the south at an angle of 30 degrees east of south.

 

Based on your description, it seems like the line representing "43' < S30E" is not being drawn in the expected direction. If you're using a CAD software or drawing tool, it's possible that there may be a misinterpretation or error in the software's handling of the angle.

 

One way to troubleshoot this issue is to manually draw the line using the correct bearing. For example, in this case, you would start from the reference point (0,0) and move in a direction 30 degrees east of south for a length of 43 feet. This can help ensure that the line is drawn correctly, even if the software is not interpreting the angle as expected.

 

If the issue persists, it might be worth double-checking the accuracy of the site plan or consulting with a professional surveyor who can provide further guidance on how to interpret and accurately represent the angles on the plan.

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Kent1Cooper
Consultant
Consultant

@jayhar wrote:

.... it seems like the line representing "43' < S30E" is not being drawn in the expected direction. ....


It's simply missing the d between the 30 and the E, as @Patchy included in Message 2.

Kent Cooper, AIA
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ballch49ZUG
Contributor
Contributor

That was just a typo on my part. 

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Valentin-WSP
Mentor
Mentor

@ballch49ZUG ,

 

Confirm you have PLAN and UCS to WORLD, and try again.

 

ValentinWSP_0-1683728565878.pngValentinWSP_1-1683728585765.png

 

Also, verify the "Clockwise" option in your Drawing Units is not checked.

 

ValentinWSP_2-1683728860664.png

 



Please select the "Accept as Solution" button if my post solves your issue or answers your question.


Emilio Valentin
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ballch49ZUG
Contributor
Contributor

All are confirmed. Still happens. 

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ballch49ZUG
Contributor
Contributor

This problem happens when using the dynamic input. 

If I use @Anonymous'<S30dE - it works

If I use <S30dE (enter) 43' - it works

I just don't understand why the direction I drag the mouse has an effect on which direction the line goes when giving it specific distance and angle. Or more specifically why it goes in the opposite direction of the direction I pull the mouse. 

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Kent1Cooper
Consultant
Consultant

Might the issue be about the difference between absolute and relative polar coordinates?  See >this<.

Kent Cooper, AIA
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ChicagoLooper
Mentor
Mentor

Hello @ballch49ZUG 

 

Here's a typical example illustrating how the distance and bearings work. Your mileage may vary.

 

101.PNG

 

Notes:

  • The distance is always preceded by '@' 
  • The '<' sign always precedes the bearing.
  • The bearing is typically sandwiched between the vertical bearing (N or S) and the horizontal bearing (E or W).
  • The start and end points of a line segment might be reversed and can create confusion. If you rotate the line 180-degrees at its midpoint and move the line accordingly, you can correct the problem. Rotation like this will not change the line's length nor orientation with respect to the north pole and equator. 
  • Although the survey's POB (Point of Beginning) is fully described in the survey, the start and end point of each individual line segment is not mentioned in the metes and bounds.
  • Many surveys are undertaken using hand-held, battery powered instruments.
  • Although Bluetooth and mobile connections are becoming more common, data collected by hand-helds are typically uploaded to computers back in the office, which in turn, are compiled and downloaded for reports and to generate Cad drawings.
  • It is the responsibility of the downloading program, not necessarily human input, to make downloads user friendly.  

Chicagolooper

EESignature

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parkr4st
Advisor
Advisor

ACAD 2019  PLAN and UCS to World

the start point and line list from a word processor as below

copy; LINE and paste on the command line, ENTER

The three lines are drawn correctly.  

 

0,0
@161.83<n0d41'e
@Anonymous<s89d54'30"e
@Anonymous<s30de

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ballch49ZUG
Contributor
Contributor

I appreciate everyone's response. Unfortunately, they don't really provide the answer I was looking for. 

 

The consensus seems to be that when using Surveyor's Units for angles, the input must be proceeded by < for it to work properly. Just using the dynamic input in its default relative polar format does not give the results as anticipated. This is odd since it does work if using the "@" and "<" which are also inputs for relative coordinates.

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Patchy
Mentor
Mentor

they don't really provide the answer I was looking for

 

You don't use a pair of pliers to do the hammer's job, and that's the answer.

 

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