topic Re: Simplify building with orthogonal angles aka creating rectangular building outlines in Geoprocessing Questions

Simplify building with orthogonal angles aka creating rectangular building outlines

MarkVolz — Fri, 16 Oct 2015 20:18:51 GMT

Hello,

Our LiDAR data included a polygon building footprints. unfortunately the building footprints look more like blobs than actual building footprints. I would like to know if there is a way to convert the blobs into a generalized building footprint such that:

All of the angles within a single building are at 90 degree angles.
The entire building may be rotated if necessary - if the building itself is rotated like in the image below
The building should not include any noise out of the predominant footprint. The highlighted areas in the image below should be removed.

Please note: I am not necessarily looking for "accurate" footprints. Instead I just footprints that (without any air photos turned on) look like they possibly could be building footprints.

Thanks

Image 1. Building footprints in purple. The building simplify and polygon simplify tasks help create nicer looking polygons but fail to create rectangular polygons that users would otherwise expect.

Re: Simplify building with orthogonal angles aka creating rectangular building outlines

DanPatterson_Retired — Fri, 16 Oct 2015 21:26:38 GMT

You can rule out

convex hulls
minimum area bounding rectangles (oriented) (MABR)
some auto truncate algorithm

You could try

Simplify Polygon—Help | ArcGIS for Desktop
the following workflow on features with exterior fiddly bits
- buffer inward ( to pinch off extraneous bits) ,
- calculate area and remove the bits smaller than the desired minimum size,
- followed by an outward buffer by the same amount as the inner buffer
- perform a MABR now
for features with corners etc pinched off
- MABR
manually edit
live with it

MABR can be found in Bounding Containers

it includes other container types. Useable with shapefiles as input and outputs... move to a gdb when you are done.

Some images Re: Ranking parcels according to the shape of their geometry (square\rectangular),

Re: Simplify building with orthogonal angles aka creating rectangular building outlines

ClaytonCrawford — Thu, 22 Oct 2015 16:41:12 GMT

RegularizeBuildingFootprint was made for this - available in ArcGIS Pro 1.2 now. Will be in 10.4.

Re: Simplify building with orthogonal angles aka creating rectangular building outlines

MichaelVolz — Thu, 22 Oct 2015 16:55:30 GMT

Can data modified in ArcGIS Pro be converted/exported to a format where it can still be used in ArcGIS Desktop?

Does ESRI have plans to make the RegularizeBuildingFootprint tool available in ArcGIS Desktop?

Re: Simplify building with orthogonal angles aka creating rectangular building outlines

ClaytonCrawford — Thu, 22 Oct 2015 17:23:17 GMT

GP tools in Pro are reading and writing the same data formats as 'Desktop'. The difference here is just what host is being used to run the tool. Yes, the tool will be in 'Desktop' (aka 'Classic') - that's what I meant by 10.4. Sorry, I know it's a bit confusing.