[OSM-newbies] How to draw land-use areas

Renaud MICHEL r.h.michel+osm at gmail.com
Sun Apr 15 21:41:08 BST 2012


Hello
On dimanche 15 avril 2012 at 19:53, Charlotte Wolter wrote :
>          In the process of remapping work by "blars," I've come 
> across a way to draw land use that is new to me. He draws the 
> land-use areas out to the middle of the streets. For example, if he 
> is specifying a city block as "residential," he draws the outline 
> down the middle of the surrounding streets, and all the points in the 
> outline intersect with the points that create the street.
>          Is this the way land sue should be done?

Non, I think this is wrong, either the landuse include the road or it 
doesn't, but it would be strange if it included only half of it.

And with that you would end up with incorrect geometry if you have two 
different landuse on each side of the road, if you use the road as the 
border for the areas they will end up sharing a border, which they don't as 
there is the road between them.

Of course, there are some case where it can be different, like country or 
regional borders which may actually be defined as being in the center of the 
road (I know it happens for rivers, I don't know if the case exists with 
roads), but those are not modelled as areas and it seems to me more the 
exception than the rule.

-- 
Renaud Michel



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