topic Re: Intersections of a fishnet in ArcGIS Pro Questions

Intersections of a fishnet

JoeBorgione — Tue, 03 Nov 2020 21:41:32 GMT

ArcGIS Pro 2.6

I have a fishnet of polyline segments that I would like to create intersection points from. See illustration below. This fishnet is the addressing grid of my area of jurisdiction so the object is to have a point (mulitple points, actually) that has the coordinate values of the intersecting lines.

At the intersection of 200 South and 8700 West, I would like two points, one with the coordinates of 200 South , 8700 West the other with the coordinates of 8700 West, 200 South. How does one go about doing this?

I looked at Point at every intersection which refers you to Feature builder reference but I don't see the point at every intersection icon there.

Suggestions?

Re: Intersections of a fishnet

DanPatterson — Tue, 03 Nov 2020 21:57:39 GMT

Is it a "group template" you are working with?

Feature templates—ArcGIS Pro | Documentation

In a group template, the Point at every intersection builder generates point features at a specified offset at every intersection of a polyline feature you create in a map. The builder is available with point component templates when the primary feature geometry is a polyline.

Re: Intersections of a fishnet

Scott_Harris — Tue, 03 Nov 2020 22:00:07 GMT

Hi Joe,

If you're creating a few features, can you use the Intersection snapping agent while creating new point features?

The other option is to use the Intersection constructor tool found on the construction toolbar:

I'm honestly not sure why the builder reference is missing the 'Point at every intersection' builder, but it should be available if you have a line as the primary geometry when creating the group template:

I'll look into whether the doc needs to be updated.

References:

Turn snapping on or off—ArcGIS Pro | Documentation

Create a point or vertex at an inferred intersection—ArcGIS Pro | Documentation

Point at every intersection (Polyline)—ArcGIS Pro | Documentation

Does that help?

Thanks,

Scott

Re: Intersections of a fishnet

JoeBorgione — Tue, 03 Nov 2020 22:21:30 GMT

That's were things kinda fell apart for me: I tried the group template but never found that point at every intersection builder...

Re: Intersections of a fishnet

JoeBorgione — Tue, 03 Nov 2020 22:22:43 GMT

Let me take another look at this Scott..

Re: Intersections of a fishnet

JoeBorgione — Tue, 03 Nov 2020 22:54:18 GMT

Scott Harris‌ : I don't see that intersection tool under construct:

I must be doing something wrong as I don't get the same options you show in templates:

Re: Intersections of a fishnet

Scott_Harris — Tue, 03 Nov 2020 23:02:05 GMT

Hi Joe,

Regarding the Intersection construction tool, it shows up on the Construction Toolbar when you are creating a point or line or poly. Open Create Features pane > choose the point template > choose the Point tool....

> construction toolbar will show up on the map (defaults to the bottom):

Regarding the group template, from your screenshot, click Apply and add in any point feature template. It requires Line as primary and a point as secondary "component".

Does that help?

Thanks,

Scott

Re: Intersections of a fishnet

JoeBorgione — Tue, 03 Nov 2020 23:25:17 GMT

Not much of this is making sense to me right now, but I'll deal with it...

Re: Intersections of a fishnet

DanPatterson — Tue, 03 Nov 2020 23:29:44 GMT

Too bad the output for the table isn't what you want, but I have a point as mesh tool in my

https://community.esri.com/people/danretired/blog/2020/05/15/point-tools-for-pro

toolset

Re: Intersections of a fishnet

DanPatterson — Sat, 11 Dec 2021 14:44:24 GMT

Slow night... some election coverage going on

 def joe(z, xstep, ystep):
    """test"""
    z0 = z.split(" ")
    lft = "West {}".format(int(z0[0][1:]) + ystep)
    rght = "South {}".format(int(z0[1][1:]) + xstep)
    return "{} {}".format(lft, rght)‍‍‍‍‍‍‍‍‍‍‍‍

That might give you a start, and you could add a comma for splitting if you want, then make a left and right field for 2 column labelling. But you can mess with that if it gets you closer

Re: Intersections of a fishnet

JoeBorgione — Tue, 03 Nov 2020 23:56:01 GMT

Slow night... some election coverage going on

As a Canadian, do you ever feel like you are living upstairs from a meth lab apartment?

Re: Intersections of a fishnet

DanPatterson — Wed, 04 Nov 2020 00:00:35 GMT

Re: Intersections of a fishnet

JoeBorgione — Wed, 04 Nov 2020 14:50:56 GMT

Scott Harris‌- after a good night's sleep, I've been able to create the group template. What's the next step? Surely I'm not going to drop a point at every intersection; When I run the Intersect gp tool, I get 105,000 points. I'd like to somehow use those points:

Re: Intersections of a fishnet

Scott_Harris — Wed, 04 Nov 2020 15:52:52 GMT

Hi Joe,

Glad you got some rest... I know I didn't.

I guess I made an assumption about what you needed. Since, in your original questions you were looking at feature templates, I didn't consider that you wanted an automated solution and not a manual editing solution. By the way, the builder reference doc will be fixed for the next release.

If the goal is getting those "coordinate" attributes on those points, perhaps a join using FID_AddressGridMDG of the points and OID of the lines will get you part way there and then perhaps a spatial join with a bit more data massaging. Sorry I don't have a full solution since it's not my area of expertise . Hopefully, someone else can chime in.

Thanks,

Scott

Re: Intersections of a fishnet

JoeBorgione — Wed, 04 Nov 2020 16:00:09 GMT

Glad you got some rest... I know I didn't. I trust you weren't worried about a solution for me!

I've been messing around a bit with a spatial join. Thanks Scott!

Re: Intersections of a fishnet

JoeBorgione — Wed, 04 Nov 2020 22:07:33 GMT

If anyone is interested here is what I did to get what I wanted:

Intersect the fishnet lines with themselves to get a set of intersection points.
Spatially join those points back with the fishnet. That produces 'stacks' of up to 16 points each with one of the field values (coordinates like 1200 South or 6600 West) from the lines.
Dissolve the stacks of points on the coordinates field, which reduces the stack to just 2 points: one has 1200 South, the other 6600 West (or what ever).
Finally, perform a spatial join with the one to one option on those points and you end up with a single point with both values at the intersection location.

Ugly? Yes. But it did the trick.