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How to automatically calculate the angle between two intersecting polylines

FatmaŞenol

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

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Accepted answers

DanPatterson_Retired

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.

All comments

WesMiller

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

FatmaŞenol

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 ?

WesMiller

Attached is an updated model and the results. Below are the steps I used.

open new empty map
add your polygons
convert your polygons to lines Feature To Line—Help | ArcGIS for Desktop
delete identical Delete Identical—Help | ArcGIS for Desktop
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

findAngle.zip

WesMiller

Did you change the distance in both places

FatmaŞenol

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.

FatmaŞenol

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.

WesMiller

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

FatmaŞenol

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.

FatmaŞenol

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

FatmaŞenol

Wes,

I just want to clarify that I should change `Roads` to my polyline in entire model, am I right ?

Regards

WesMiller

Yes this tool was intended to process lines

FatmaŞenol

Thank you for your reply. Actually, I'm working on a polygon layer. Does this tool also process polylines ?

WesMiller

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.

FatmaŞenol

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 ?

DanPatterson_Retired

I have never used it, perhaps Wes Miller knows the ins and outs of it

FatmaŞenol

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.

DanPatterson_Retired

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?

WesMiller

See this thread Calculating angles using ArcGIS Desktop 10.2

FatmaŞenol

Dan,

Thank you for the information about my question. I'm trying to figure out how I can apply the method

you summarized.

DanPatterson_Retired

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.

DanPatterson_Retired

backgrounder information How to find adjacent polygon boundaries closer than a certain distance

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