topic Re: Splitting polygon into equal 'pie slices' in ArcGIS Pro Questions

Splitting polygon into equal 'pie slices'

CourtneyHendrickson — Sat, 15 Apr 2023 17:19:23 GMT

Hi there,

I'm a freshwater ecologist setting-up pond sampling stations for an upcoming field season. I'm trying to divide the pond into 10 equal segments using 5 diagonal lines (see example image) in ArcGIS Pro 3.0.3. I've tried drawing a polygon around the pond, but I also couldn't figure out how to split the polygon perimeter into 10 equal lengths (tried using split function).

Any help would be much appreciated, thank you!

Re: Splitting polygon into equal 'pie slices'

DavidPike — Sat, 15 Apr 2023 17:37:48 GMT

If it's just for 1 or a few ponds then you could do the following manual steps, but unless the pond is a perfect circle it becomes very difficult to achieve equal parts:

find the centroid (centre of mass) of the pond - https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/feature-to-point.htm - use "CENTROID"

If you have a feature class of the pond, it will have an attribute called "SHAPE_LENGTH", this is the perimeter of your pond in coordinate system values (metres etc.). If you have shapefile then iId convert it to a feature class to get this value. Take this perimeter value and divide by 10. use this value in https://pro.arcgis.com/en/pro-app/latest/tool-reference/data-management/generate-points-along-lines.htm tool "DISTANCE" parameter. e.g. perimeter = 100m , point_placement="DISTANCE", distance =10

this then generates the points on the perimeter. You could then manually create the lines using the points to snap to.

Re: Splitting polygon into equal 'pie slices'

CourtneyHendrickson — Sat, 15 Apr 2023 22:44:07 GMT

Thank you so much! This is exactly what I was looking for - I really appreciate your help!