topic Select Streets or Sidewalks based on width in ArcGIS CityEngine Questions

Select Streets or Sidewalks based on width

MattOlsen — Tue, 05 Jul 2022 09:22:15 GMT

Hi all,

I'm hoping this one is relatively straightforward - I've looked through documentation and articles but couldn't quite find an answer.

I'm looking to automatically select streets or sidewalks based on their widths (actually, within a certain range of widths), so I can apply certain attributes using the complete streets rules.

This seems like a job for a python script?

Wondering if any has any suggestions for this.

Matt

Re: Select Streets or Sidewalks based on width

plfontes — Wed, 06 Jul 2022 10:18:13 GMT

Hi Matt,

hereunder a python script to select graph segments by streetWidth attribute, just replace the min and max values (without quotes) in the last line by your desired range values:

''' Created on 06 Jul 2022 @author: PFontes ''' from scripting import * # get a CityEngine instance ce = CE() def selectByAttribute(attr, minValue, maxValue): objects = ce.getObjectsFrom(ce.scene, ce.isGraphSegment) selection = [] for item in objects: attribute = ce.getAttribute(item, attr) if attribute >= minValue and attribute <= maxValue: selection.append(item) ce.setSelection(selection) if __name__ == '__main__': selectByAttribute("/ce/street/streetWidth", "(minimum value inclusive)", "(maximum value inclusive)")

Hope this is what you're looking for.

Re: Select Streets or Sidewalks based on width

MattOlsen — Wed, 06 Jul 2022 09:23:52 GMT

@plfontes - thank you for the quick response on this. This does look like what I'm looking for, however it isn't currently working so I think I'm missing a step somewhere along the way..

I've created a new python module (with your code), in the same cityengine project as the scene file - for testing's sake I've tried very large values (0 to 1500) and smaller ones (0 to 15).

When I run the script (Python > Run Script?), no streets are selected. In the screenshot below I've manually selected one of the streets with a width of 10, so this should in theory be selected by the script.

Can you see any steps I've missed here?

Re: Select Streets or Sidewalks based on width

plfontes — Wed, 06 Jul 2022 09:35:26 GMT

Yes, my bad.

just include a "/" at the beginning of the attribute name in the last line to look like this "/ce/street/streetWidth"

Should work now.

Re: Select Streets or Sidewalks based on width

MattOlsen — Wed, 06 Jul 2022 10:12:33 GMT

Works like a charm. Thank you!