[OSM-talk] Not attaching polygons to roads

Dave F. davefox at madasafish.com
Wed Feb 26 19:38:33 UTC 2014


On 26/02/2014 18:34, moltonel 3x Combo wrote:
> On 26/02/2014, Dave F. <davefox at madasafish.com> wrote:
>> On 26/02/2014 10:27, Pieren wrote:
>>> On Wed, Feb 26, 2014 at 1:33 AM, Clifford Snow <clifford at snowandsnow.us>
>>> Think that, in some parts of the world, you don't have high res.
>>> images and you cannot count the amout of lanes or see the shoulders or
>>> the limit between the road and next landuse.
>> If there's no imagery to work from & the person has never seen the area
>> before then they really shouldn't be mapping it. If a visual survey has
>> been performed a bit of 'guesstimating' the distance to the centreline
>> from the boundary edge is *still* more accurate than attaching it the
>> the way of the road.
> That guesstimate is often way off when you have no imagery and little
> data, because your sense of scale has no reference. I've made the
> mistake many times only to think "silly me" when revisiting an area
> once imagery became available.
>
> In that context, I agree that glueing the poly to the street may be
> just as good as separating it. At least then it's obvious that the
> data is just a schematic model and not an accurate-ish representation.

As I see it, a separate poly would be inaccurate, a joined poly to way 
would be wrong, so ironically the inaccurate would be the more accurate.

Dave F.

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