3D Line Of Sight - Visibility From Roads

[ShaunWeston]

I'm just wondering how to go about getting a map showing the visibility from roads to a certain observer point.

This was done in the International User Conference presentation and I haven't quite figured out how to get a birds eye view of the roads that are visible and the roads that are not visible to a certain observer point.

Attached is a jpg of what I'm after and also attached is a jpg of a model that I have built to try and achieve this, but it's not quite working correctly.

So, does anyone know the workflow to get a 2D map showing this?

[Anonymous User]

Original User: nath2869

Hi Shaun,

You're pretty close. After contructing the view lines to test and running Line of Sight (which it appears you have under control already), what I did was:
- Get all the visible points (the points where the visible LOS lines touch the roads)
- Buffer them by just a bit over half of the spacing distance (to create merged polygons)
- Intersect the visible-coverage polygons with the Road lines
-> The results are the road lines that are have a view to the building (including the 'error' margin)

I created a little graphical mockup image showing the steps - attached.

Thanks, Nathan.

[ShaunWeston]

Cheers Nathan

Yeah Buffering the point makes more sense. I'll give it a go and see what happens.

Thanks for the reply.

Shaun