<br>I map almost exactly the same way<br><br><div class="gmail_quote">On Mon, Jan 5, 2009 at 2:13 PM, Roy Rankin <span dir="ltr"><<a href="mailto:rrankin@ihug.com.au">rrankin@ihug.com.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
When to use ways as common boundaries is an interesting issue with OSM.<br>
I have been an active mapper since last Easter and therefore I have<br>
though a lot about this. I am currently doing the following as a<br>
guideline but sometimes do differently if it seems best.<br>
<br>
Between roads and areas, I separate the road and the area.<br>
My thinking here is that roads typically have public owned buffer strips<br>
on either side and usually a solder, footpath, or curb.<br>
<br>
The other factor is that roads have two dimensions (width and length)<br>
but are represented by a one dimensional line in OSM. Thus even for the<br>
case of parking bays on a road it still makes sense to me not use the<br>
road as a boundary for the parking bay.<br>
<br>
I do, however, use common boundaries between adjacent areas. As an<br>
example, I have just mapped two schools with a common boundary and both<br>
with a boundary with a park without a gap between the boundaries. In<br>
this case I then ignore the warning messages from the JOSM validator.<br>
<br>
For areas and water boundaries (such as coastlines and lake boundaries)<br>
I use a common boundary. This makes things easier when the water<br>
boundary is tweaked because of better images or survey data.<br>
<br>
I would tend to treat rivers or streams which again are one dimensional<br>
representations of two dimensional things the same way I would treat a road.<br>
<br>
I hope others find these comments useful,<br>
<font color="#888888">Roy Rankin<br>
</font><div><div></div><div class="Wj3C7c"><br>
<br>
Liz wrote:<br>
> On Sat, 20 Dec 2008, Nick Hocking wrote:<br>
>> Talking of bridges, I'm trying to add a bridge, over a storm water drain to<br>
>> a road in Canberra.<br>
>> However it is just about impossible since on each side of this road is a<br>
>> park and the parks are using<br>
>> parts of the road as part of their own perimeter.<br>
><br>
> I've thought about this a bit more, and its not the best idea to be using<br>
> roads as park or other area perimeters.<br>
> It sure would make it fast to put this stuff in initially, but any subsequent<br>
> alterations - say changes in the road itself - mean big alterations to be<br>
> made by the next mapper.<br>
><br>
><br>
><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Franc<br>