topic Re: Split / Divide large polygon with point shapefile in Data Management Questions

Split / Divide large polygon with point shapefile

GarrettRoss — Mon, 02 Dec 2013 15:58:17 GMT

I have a large polygon shapefile that represents streets and a large point shapefile that represents intersections.
Is there a way to split the polygon shapefile at each intersection point?
[ATTACH=CONFIG]29493[/ATTACH]

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Mon, 02 Dec 2013 16:07:40 GMT

What's your end goal here?

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Mon, 02 Dec 2013 16:18:35 GMT

Basically I would like to have individual polygons intersection to intersection.

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Mon, 02 Dec 2013 16:24:37 GMT

Do you then need to name the polygons etc? What do you fully need as a final product?

Re: Split / Divide large polygon with point shapefile

TimWitt — Mon, 02 Dec 2013 16:26:28 GMT

The only way I see is, creating a buffer around your points and using that polygon file to cut your street file.

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Mon, 02 Dec 2013 16:30:09 GMT

Need a "new" polygon shapefile that has intersection to intersection polygons.
No need to name the polygons, though would be nice..
I will be using these individual polygons to calculate square feet and items contained within
each polygon for assest management.

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Mon, 02 Dec 2013 16:33:34 GMT

I agree with Tim, but it could get messy.

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Mon, 02 Dec 2013 16:34:31 GMT

I have tried the buffer option by doesn't seem to work because of the intersections are not consistant in size or configuration, some our 2 leg, 3 leg, 4 leg, and 5 leg intersections.

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Mon, 02 Dec 2013 16:39:03 GMT

That's the messy part. I think you're in for a lot of manual work here either way, unless you have a convenient road segment polyline file with width data included.

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Mon, 02 Dec 2013 16:40:24 GMT

Someone in our organization has done this before but now I am tasked with reproducing an update and unable contact the person who originally completed the task. See the attached. somehow it looks as if lines where placed at the points on intersections and then processed.[ATTACH=CONFIG]29499[/ATTACH]

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Mon, 02 Dec 2013 16:41:57 GMT

I do have a road segment polyline file but no width data included.

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Mon, 02 Dec 2013 16:47:48 GMT

looks like they might have used a distance to polygon type of thing using the polygons between the roads, then used the resultant lines to cut the roads

Re: Split / Divide large polygon with point shapefile

Zeke — Tue, 03 Dec 2013 14:32:36 GMT

Could you use the streets as lines in the Create Polygons tool? This might result in some extra polygons, but less manual work than other approaches. This seems too easy though, I must be missing something.

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Tue, 03 Dec 2013 19:33:53 GMT

I recall using a tool a couple of years ago (it escapes me now) that took a point file, and created a shape file layer of polylines that gave minimum distances from each point to each polygon in the other layer (in this case the polygons between the road polygons).

This looks like what was done here, but delete any polylines with length greater than the road width, and use that polyline shape file to cut the road polygons.

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Wed, 04 Dec 2013 16:06:58 GMT

I would have thought there would be a tool out there somewhere, I have seen other files from other agencies that where done this same way while searching for a solution but no one will let me in on the "secert".:)

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Wed, 04 Dec 2013 16:08:40 GMT

"secret".:)

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Wed, 04 Dec 2013 16:22:36 GMT

pssst...hey bud...

I recall using a tool a couple of years ago (it escapes me now) that took a point file, and created a shape file layer of polylines that gave minimum distances from each point to each polygon in the other layer (in this case the polygons between the road polygons).

This looks like what was done here, but delete any polylines with length greater than the road width, and use that polyline shape file to cut the road polygons.

I think is was one of the spider diagram tools in ET Geowizards

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Wed, 04 Dec 2013 17:11:52 GMT

Found it, but it's point to point, not point to feature unfortunately.

http://arcscripts.esri.com/details.asp?dbid=14908

You need to find a script or tool that will draw a polyline from each intersection point to each "void" polygon to get started.

Re: Split / Divide large polygon with point shapefile

GarrettRoss — Wed, 04 Dec 2013 17:22:23 GMT

Do you think this will work in ArcGIS 10.0?
I am thinking you're on the right track with the spider diagram looking at the examples I have, THANKS!
I'll let you know.

Re: Split / Divide large polygon with point shapefile

michaelcollins1 — Wed, 04 Dec 2013 18:57:38 GMT

spend a couple of hundred dollars on ET Geowizards, well worth the money for us poor ArcGIS Basic users.

http://www.ian-ko.com/

You can download it for free and use the "non-free" tools for a while.

Use Spatial Relations and Allocations\Spider Diagram - Attribute Link

Ensure that there is a field in each of the intersection and void polygon layers that have identical values (I created a field in each called NewID and populated all with zeros. If the are unique it will only do matching polygons)

Eliminate all of the unwanted polylines in the resultant shape file (i.e. lines > 5 m etc.)

Use resultant polyline shape file with the Polygon\Split Polygons with Polylines tool to split your road polygons.