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

[Charlotte Wolter]

         I agree that, for a large area with the same land use, you 
draw the land use as one large polygon and put the roads on top of it.
         However, where you have a strip of retail at one end of a 
city block, I think that land use begins at the edge of the buildings 
and should not include even the sidewalk. These areas of land use are 
by their nature patches of use, not large areas. There might even be 
a church in the middle of the block. I can't see extending these 
land-use areas to the middle of the street. It makes any changes to 
the area more complicated.

--C


At 05:57 PM 4/15/2012, you wrote:
>On Sun, Apr 15, 2012 at 6:12 PM, Charlotte Wolter 
><techlady at techlady.com> wrote:
>
> > Yes, I agree, but this guy is drawing the margins, not just in 
> the middle of
> > the road, but linked to the road, using the same points as the road. Also,
> > he did this even when the land use is different on both sides of the road.
> > It makes changing the road and/or changing land use a real bitch.
>
>I would think the opposite... If the road is in the wrong location,
>and you move the nodes that define the road, the land use on either
>side is updated automatically. If the land use polygons were
>completely separate, and you changed the geometry of the road, you
>would then have to change the geometry of the land use polygons to
>match the road geometry.
>
>It's all in how you look at the map, and the mapping concepts. OSM has
>no overarching body that says "You will map things this way!", so
>everyone does things the way they feel is best. This can lead to
>people mapping things, others ripping it up, and then an editing war
>ensues.
>
>My personal feeling is that if you're going to map landuse to the
>physical edge of the road, then you should create the road as a
>polygon to show the edge of the road sharing the edge of the landuse.
>Hmm, let's see around here we would need to put the edge of the
>landuse polygon on the edge of the privately owned land, and then
>create a polygon for the government owned road allowance, and within
>that road allowance, draw another polygon defining the physical space
>occupied by the road surface.
>
>The front of my city lot, which looks to be my front lawn actually has
>6 feet of grass that belongs to the county, which is used for
>utilities. Should I draw a residential land use polygon to the edge of
>my property, then a county allowance polygon followed by a polygon
>defining the sidewalk, and then finally a polygon showing the paved
>surface of the road?
>
>How much detail do you really need to convey? I would agree with just
>making a large polygon that defines the full residential area, and
>layering the roads over top of it. Reusing the nodes defining a
>roadway as an edge of the land use polygon makes sense to me. It does
>make it harder to manipulate only one entity that is using the shared
>nodes, but that's a trade off that you have to deal with.
>
>--
>James
>VE6SRV
>
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Charlotte Wolter
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Santa Monica, California
90403
+1-310-597-4040
techlady at techlady.com
Skype: thetechlady

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