Re: [Qgis-user] Polygon next to road search term

Wed, 14 Sep 2022 08:40:12 -0700

My starting approach would be to take the road layer and buffer that out by some small distance - say 5 meters. (Note that you have to be working in a projected coordinate system for the buffer distance to have useful meaning.) I would then intersect the buffered layer with the polygon (lot) layer. The resulting intersections will be the overlaps between the buffered roads and the polygons. The attribute table will contain a list of all the intersections and each row of the table will contain the attributes of both the lots and the roads, so if the lots and roads have attributes with meaningful names, you will have a list of all lots that intersect roads and the names of the road it intersects with.

You could also try extract by location from the processing toolbox. This would give you a layer of the original lots (polygons) that intersect some road, but won't tell you which road.

On 9/13/2022 10:19 PM, Jon via Qgis-user wrote: 
I would want the polygon to have road access. So you should be able to
access the polygon firectly from a road. Just a corner touching may
work but that would depend on an easement and I am having enough
trouble just trying to figure out what I should be searching on without
throwing that in as well.

So at this point, the polygon should be able to be accessed by the road
line. So possibly 20' of the road line is touching the polygon.

-----Original Message-----
From: David Strip <[email protected]>
To: [email protected], [email protected]
Subject: Re: [Qgis-user] Polygon next to road search term
Date: Tue, 13 Sep 2022 21:12:01 -0600

  Is a polygon "next to a road" because one (or more) edges of the polygon is exactly coincident with the road line? Or is it within some distance of the road line? These lead to different solutions, but unless your data is very precise, asking for the boundary to be exactly coincident with a road line is not going to be very robust.Does your road polyline feature have a road width? If so, does that factor into "next to"?
 
 
 On 9/13/2022 5:26 PM, Jon via Qgis-user wrote: 

I am trying to figure out if a property that is a polygon is next to a
polyline (road). I am not well versed with QGIS and every search I do
seems to tell me how to map a polygon onto a road or convert polylines
to a polygon. I am not sure what exactly I need to search on to find
some documentation on how to do what I am looking to do.

What should I be searching on to find if a property that has 4 sides
and is a polygon is next to a road? Is what I am trying to find called
something specific and that is why I am not finding?

Thanks for any help,

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