topic Re: how to create multiple polygon features from a set of cornerpoints in Roads and Highways Questions

how to create multiple polygon features from a set of cornerpoints

GUNASEKARANJOSEPH_IRWIN — Fri, 09 Dec 2016 18:01:09 GMT

I have a point shape file which contains corner points of buildings or houses. How can I create house foot prints for all the corner points in the layer at once. If I use minimum bounding rectangle, it created one big polygon around all the points, I want to have separate minimum bounding rectangle for each set of points in the point layer..!!. I hope you all understood the issue.

Re: how to create multiple polygon features from a set of cornerpoints

DarrenWiens2 — Fri, 09 Dec 2016 18:05:10 GMT

Do the points have an attribute that ties together the points of a specific building? For example, all corners of first building have value 1, points from second building have value 2, etc.

Re: how to create multiple polygon features from a set of cornerpoints

GUNASEKARANJOSEPH_IRWIN — Fri, 09 Dec 2016 18:31:31 GMT

Hi Darren,

No these point does not contain any attributes,They are just points with xyz.

Re: how to create multiple polygon features from a set of cornerpoints

DarrenWiens2 — Fri, 09 Dec 2016 18:45:50 GMT

Unless the buildings are obviously spread out (i.e. distinct clusters of points), there may not be a way to automatically connect the dots.

You could try running Points to Line which may connect most of the points if they are stored in order. If they do turn out to be in order, and each building has exactly 4 corners, you may be able to script the rectangles in Python (although there is some question whether the points are guaranteed to be read in order).

Re: how to create multiple polygon features from a set of cornerpoints

AbdullahAnter — Fri, 09 Dec 2016 18:46:20 GMT

So how do you know the corners for each build?

Re: how to create multiple polygon features from a set of cornerpoints

GUNASEKARANJOSEPH_IRWIN — Fri, 09 Dec 2016 19:03:55 GMT

extracted from lidar

Re: how to create multiple polygon features from a set of cornerpoints

RebeccaStrauch__GISP — Fri, 09 Dec 2016 23:04:29 GMT

Since you have the lidar, I wonder if there if anything in this blog that might help

https://community.esri.com/people/GTaylor-esristaff/blog/2016/06/24/3d-workshop-feature-extraction-tools I think this is written for Pro.

Or this arcgis desktop - Building extraction with LiDAR data (Improve Process) - Geographic Information Systems Stack Exchange

If not, Darren's suggestions might be the best semi automated process. (Points to lines...Gen cleaning up by editing) or, again, if the points are in order....points for each building in groups, you could add a field and give a unique value for each building, then loop thru the groups to make the buildings, either with points to lines or points to polygon.

Do a web search on extracting building footprints and there are many threads on this topic (although most are aerial photos or older tech, not lidar)