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How to automatically calculate the angle between two intersecting polylines

Question asked by IYTE-ARCHITECTURE on May 1, 2016
Latest reply on Jun 7, 2016 by wwmiller68

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Hello,

I have 52338 polygons which needs to be edited using the following rules;

The distance between the intersection point and the closest vertices on two intersecting

polylines should be at least 1.2 meter as shown below. On the other hand the distance

between two closest vertices should not be less than 2 meters. What I'm trying to do is

automatically calculate the optimum angle angle between two polylines to meet the given

two rules as I explained above.

ArcGIS Desktop doesn't have such built-in tool to calculate the angle as far as I know.

Is there any tool or script that you could suggest ? If there is no such solution it would

also be great, to select vertices which are 2 meters apart from the intersection point.

I will be grateful for any help you could provide.

Regards

Dan_Patterson

May 1, 2016 3:02 PM

Correct Answer

Given the radius from the intersection point and the distances to the minimums on the intersecting lines, you have formed a chord Chord (geometry) - Wikipedia, the free encyclopedia

So you have the 'circle' radius, the chord distance (cd), hence the angle (theta in the link) can be solved as the minimum requirement given, r and cd. As r varies so will theta, given a cd.

If you have already existing polylines, there is no guarantee that there will be vertices at r, so one will have to be created of course.

See the reply in context

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33 Replies

Dan_Patterson May 1, 2016 2:55 PM
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backgrounder information How to find adjacent polygon boundaries closer than a certain distance
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Dan_Patterson May 1, 2016 3:02 PM
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Given the radius from the intersection point and the distances to the minimums on the intersecting lines, you have formed a chord Chord (geometry) - Wikipedia, the free encyclopedia
So you have the 'circle' radius, the chord distance (cd), hence the angle (theta in the link) can be solved as the minimum requirement given, r and cd. As r varies so will theta, given a cd.
If you have already existing polylines, there is no guarantee that there will be vertices at r, so one will have to be created of course.
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IYTE-ARCHITECTURE May 3, 2016 12:56 AM
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Dan,
Thank you for the information about my question. I'm trying to figure out how I can apply the method
you summarized.
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- Dan_Patterson @ IYTE-ARCHITECTURE on May 3, 2016 1:02 PM
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  is it just the how to calculate angle part, or the whole process as perhaps shown in Wes's post, or have you not obtained the lines for calculating angles?
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  - IYTE-ARCHITECTURE @ Dan_Patterson on May 4, 2016 12:39 PM
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    Hello,
    It is the whole process as shown on Wes's post. I tried to run find angle tool but got error message
    saying `unable to execute the selected tool`. I have ArcGIS for Desktop 10.3.1 Advanced license.
    Is there anything to fix this problem.
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    - Dan_Patterson @ IYTE-ARCHITECTURE on May 4, 2016 12:40 PM
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      I have never used it, perhaps Wes Miller knows the ins and outs of it
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wwmiller68 May 3, 2016 5:37 AM
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See this thread Calculating angles using ArcGIS Desktop 10.2
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- IYTE-ARCHITECTURE @ wwmiller68 on May 4, 2016 1:00 PM
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  I checked the thread you're referring to. I'm using ArcGIS for Desktop Advanced (10.3.1) but I'm unable to run find angle tool since ArcGIS 10.3.1 says `unable to execute the selected tool`. Is there a workaround for this issue ?
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wwmiller68 May 4, 2016 1:02 PM
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Right click the Find Angle tool and choose edit when the model opens change "Roads" to your line file. Then click "Model" -> "Run Entire Model" tell me where the process stops everything that has ran will have a shadow behind it.
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- IYTE-ARCHITECTURE @ wwmiller68 on May 4, 2016 1:22 PM
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  Thank you for your reply. Actually, I'm working on a polygon layer. Does this tool also process polylines ?
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  - wwmiller68 @ IYTE-ARCHITECTURE on May 4, 2016 1:26 PM
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    Yes this tool was intended to process lines
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    - IYTE-ARCHITECTURE @ wwmiller68 on May 6, 2016 10:28 AM
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      Wes,
      
      I just want to clarify that I should change `Roads` to my polyline in entire model, am I right ?
      
      Regards
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      - wwmiller68 @ IYTE-ARCHITECTURE on May 6, 2016 10:57 AM
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        Just the first one with the little "p" next to it
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    - IYTE-ARCHITECTURE @ wwmiller68 on May 11, 2016 8:43 AM
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      Hello Wes,
      I used the Find Angle tool several times and noticed something unusual. Could you let me know
      If there is something that I missed? The attached screenshot shows all intersection points. Red points show
      where the near angle is between 20 and 30 degrees. However, this tool also seems to select the intersection
      points where the near angle between two polylines are not between these values. I would appreciate any suggestions.
      Thank you.
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      - wwmiller68 @ IYTE-ARCHITECTURE on May 11, 2016 8:46 AM
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        Omur, I don't see the screen shot.
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        IYTE-ARCHITECTURE @ wwmiller68 on May 11, 2016 8:56 AM
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        Wes,
        
        I'm sorry I forgot to attach the screenshot.
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        IYTE-ARCHITECTURE @ wwmiller68 on May 12, 2016 6:05 AM
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        Good Morning. I was wondering have you had a chance to check the screenshot I posted yesterday.
        
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        wwmiller68 @ IYTE-ARCHITECTURE on May 12, 2016 6:08 AM
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        I did not get a chance yesterday. I've looked at it this morning. I'll pull the model out this afternoon and run it and see if I see anything related.
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        IYTE-ARCHITECTURE @ wwmiller68 on May 12, 2016 6:18 AM
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        Thank you for your prompt reply. I'm looking forward to hearing from you.
        
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IYTE-ARCHITECTURE May 6, 2016 11:32 PM
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Hello,

I want to thank you Dan Patterson and Wes Miller for their extremely helpful suggestions and comments.
I couldn't find `find angle` tool without Dan's help. I can't thank you enough both of you for your help
Regards
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- wwmiller68 @ IYTE-ARCHITECTURE on May 12, 2016 6:31 AM
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  I remember the tool would do give false results if the buffers would overlap. Have you tried setting the buffer size smaller? You'll need to change the buffer and change the distance in the generate near table to solve. That was one of the differences between my solution and Darren Wiens solution. If you run the model from edit you should be able to add the buffers and show the buffers and see the overlaps
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  - IYTE-ARCHITECTURE @ wwmiller68 on May 12, 2016 7:45 AM
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    No, I haven't tried setting the buffer size smaller but I will try and get back to you as soon as possible. Thank you.
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  - IYTE-ARCHITECTURE @ wwmiller68 on May 12, 2016 12:12 PM
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    Hello,
    I tried smaller buffer size (0.5 meters) and there are still some false results If I'm not mistaken.
    The attached screenshot shows a part of the resulting layer. I took the screenshot of each
    step I followed and they are available for your review at the following URL:
    Find_Angle . Thank you for your attention to this matter.
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    - wwmiller68 @ IYTE-ARCHITECTURE on May 12, 2016 1:53 PM
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      Did you change the distance in both places
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      - IYTE-ARCHITECTURE @ wwmiller68 on May 13, 2016 10:21 AM
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        Thank you for your reply. Yes, I changed the distance in both places. However, I need to double check and re-run the model
        to be sure.
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      - IYTE-ARCHITECTURE @ wwmiller68 on May 13, 2016 1:06 PM
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        I changed the distance in both places and re-run the model. 322 intersections out of 9803 were selected. Red points show where the near angle is between 20 and 30 degrees. I'm a little bit confused about false results. I attached the screenshots for your review.
        
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        wwmiller68 @ IYTE-ARCHITECTURE on May 13, 2016 1:13 PM
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        Could you upload a sample of data? Where some false results are being returned.
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        IYTE-ARCHITECTURE @ wwmiller68 on May 13, 2016 1:29 PM
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        Thank you for your kind reply. You can download the data set at the following URL:
        Dropbox - Dataset.gdb.rar
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        IYTE-ARCHITECTURE @ wwmiller68 on May 16, 2016 8:48 AM
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        Did you have a chance to look at the data set I uploaded ?
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        wwmiller68 @ IYTE-ARCHITECTURE on May 16, 2016 10:51 AM
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        I have it downloaded. Once i get caught up i'll look at it.
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wwmiller68 May 16, 2016 7:25 PM
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Attached is an updated model and the results. Below are the steps I used.
1. open new empty map
2. add your polygons
3. convert your polygons to lines Feature To Line—Help | ArcGIS for Desktop
4. delete identical Delete Identical—Help | ArcGIS for Desktop
5. open model in edit mode and set the input feature class to the above created and set other parameters as desired
Hope this helps.
The overlaps still give unwanted results
Attachments
- findAngle.zip511.6 KB
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- IYTE-ARCHITECTURE @ wwmiller68 on Jun 6, 2016 2:53 PM
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  Hi Wes,
  Please accept my apology for not writing earlier. I tested the updated model for several times and the result
  seems to be correct. I have only one more question if you don't mind my asking. The make feature layer
  tool in model does not create a point layer when I change name of the output layer and the workspace.
  Did I miss something ? I attached the screenshot of this tool to clarify my question. Could it be possible
  to change the workspace or feature dataset ?
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wwmiller68 Jun 7, 2016 6:21 AM
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Here's the help Make Feature Layer—Help | ArcGIS for Desktop
You may also be interested in
Feature Class to Feature Class—Help | ArcGIS for Desktop
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