Creating sectors

DavidMercer — Fri, 15 Aug 2025 12:31:18 GMT

Hi all,

I have a set of lines that denote a direction of movement. I would like to create 45 degree sectors that are centred on each line (i.e.) 22.5 degrees on either side of the existing line. I've tried the distance and direction tool but not sure if it's the correct tool for the job or if I'm not using it correctly - any suggestions?

Re: Creating sectors

DanPatterson — Fri, 15 Aug 2025 13:00:58 GMT

Basic code

import numpy as np def _arc_sector(radius=100, start=0, stop=1, step=0.1, xc=0.0, yc=0.0): """Create an arc from a specified radius, centre and start/stop angles Requires: --------- `radius` : number cirle radius from which the arc is obtained `start`, `stop`, `step` : numbers angles in degrees `xc`, `yc` : number center coordinates in projected units Returns: -------- points on the arc """ start, stop = sorted([start, stop]) angle = np.deg2rad(np.arange(start, stop, step)) x_s = radius*np.cos(angle) # X values y_s = radius*np.sin(angle) # Y values pnts = np.c_[x_s, y_s] cent = np.array([xc, yc]) pnts = pnts + cent sector = np.concatenate((cent[None, :], pnts, cent[None, :]), axis=0) return sector

Sample to give you an idea

radius = 10. x_c, y_c = 0., 0. line_ang = 45. # your line angle/direction... start, stop = line_ang - 22.5, line_ang + 22.5 # start and stop relative to it ar = _arc_sector(radius=10, start=start, stop=stop, step=2.0, xc=x_c, yc=y_c)

Re: Creating sectors

DavidMercer — Tue, 19 Aug 2025 11:36:21 GMT

Thanks! I'll give this a try

topic Re: Creating sectors in ArcGIS Pro Questions

Creating sectors

Re: Creating sectors

Re: Creating sectors