topic Re: How to automatically calculate the angle between two intersecting polylines in Geoprocessing Questions

How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Sun, 01 May 2016 21:43:01 GMT

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

Re: How to calculate the angle between two intersecting polylines

DanPatterson_Retired — Sun, 01 May 2016 21:55:47 GMT

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

Re: How to calculate the angle between two intersecting polylines

DanPatterson_Retired — Sun, 01 May 2016 22:02:22 GMT

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.

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Tue, 03 May 2016 07:56:53 GMT

Dan,

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

you summarized.

Re: How to automatically calculate the angle between two intersecting polylines

WesMiller — Tue, 03 May 2016 12:37:19 GMT

See this thread Calculating angles using ArcGIS Desktop 10.2

Re: How to automatically calculate the angle between two intersecting polylines

DanPatterson_Retired — Tue, 03 May 2016 20:02:12 GMT

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?

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Wed, 04 May 2016 19:39:23 GMT

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.

Re: How to automatically calculate the angle between two intersecting polylines

DanPatterson_Retired — Wed, 04 May 2016 19:40:12 GMT

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

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Wed, 04 May 2016 20:00:41 GMT

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 ?

Re: How to automatically calculate the angle between two intersecting polylines

WesMiller — Wed, 04 May 2016 20:02:26 GMT

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.

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Wed, 04 May 2016 20:22:39 GMT

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

Re: How to automatically calculate the angle between two intersecting polylines

WesMiller — Wed, 04 May 2016 20:26:29 GMT

Yes this tool was intended to process lines

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Fri, 06 May 2016 17:28:21 GMT

Wes,

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

Regards

Re: How to automatically calculate the angle between two intersecting polylines

WesMiller — Fri, 06 May 2016 17:57:53 GMT

Just the first one with the little "p" next to it

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Sat, 07 May 2016 06:32:12 GMT

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

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Wed, 11 May 2016 15:43:10 GMT

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.

Re: How to automatically calculate the angle between two intersecting polylines

WesMiller — Wed, 11 May 2016 15:46:05 GMT

Omur, I don't see the screen shot.

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Wed, 11 May 2016 15:56:42 GMT

Wes,

I'm sorry I forgot to attach the screenshot.

Re: How to automatically calculate the angle between two intersecting polylines

FatmaŞenol — Thu, 12 May 2016 13:05:31 GMT

Good Morning. I was wondering have you had a chance to check the screenshot I posted yesterday.

Re: How to automatically calculate the angle between two intersecting polylines

WesMiller — Thu, 12 May 2016 13:08:27 GMT

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.