Well,
from a GIS-persons point of view, you alway should avoid gaps in your map ( = in your data).
from a GIS-persons point of view, you alway should avoid gaps in your map ( = in your data).
Cartographic work is always generalizing the world, and only because you COULD go into detail in the sub-meter sphere technically with the digital means nowadays, you should should ask yourself: what is it good for?
So, what would be the information you provide, leaving a blank space between a field and a road?
Actually none, cause you do not specify what this gap is, although its quite clear that it's something between the road and the field.
But when its already obvious that there are strips of surface which do not belong neither to roads nor fields, you could right away leave them out and align the border of the field directly to the road.
In digitizing you normally decide about the map scale of the end product. With OSM-maps, thats a little bit difficult, cause there is no common sense about the usage, and therefor also about the production-scale.
The planned scale is important, cause it decides about the precision you need to get a satisfying result.
E.g. when you want to have a map in 1:5000, you normally digitize your features at a scale of 1:2500 or 1:2000.
The human eye can not distinguish features smaller than half a millimeter on a screen or on paper.
With a map in 1:5000, 1/2mm on screen is 2,5 meters in reality. Thats the planned "error" you are "allowed" to produce, cause on the planned scale, you can't even see it.
So the question should always be: what is the planned usage and what is the benefit from increasing the accuracy?
A field border outside a village is much less interesting than borders and features in a town center.
When the mapped part is mostly relevant for navigating, so as a real street map, you could easily set your planned scale to 1:25000 or even higher (with the resulting need for generalization), as normal users will watch it in that scale anyway to get the overview they need.
If it's a feature of high interest, you could set your planned scale to 1:1000 or lower, with a resulting need of higher accuracy.
Hope that helped a bit.
Bernd
(please be aware: this opinion might be in conflict with some holy OSM-rules set up by some OSM-priests i do not know and do not care about. This is just cartographic common sense)
Am 08.04.2012, 13:00 Uhr, schrieb <[email protected]>:
> Send newbies mailing list submissions to
> [email protected]
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://lists.openstreetmap.org/listinfo/newbies
> or, via email, send a message with subject or body 'help' to
> [email protected]
>
> You can reach the person managing the list at
> [email protected]
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of newbies digest..."
>
>
> Today's Topics:
>
> 1. Re: Boundaries and Roads (Dudley Ibbett)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 7 Apr 2012 18:24:26 +0000
> From: Dudley Ibbett <[email protected]>
> To: <[email protected]>
> Subject: Re: [OSM-newbies] Boundaries and Roads
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"
>
>
> Hi
>
> I could do with some advice on joining field boundaries to roads. I
> have been doing this as the mapping style I am use to never has the
> field boundary running along the side the road. If the field boundary
> along the road is well set back then I would consider drawing it however
> in most cases it is within a few meters of the road and sometimes there
> is not gap at all. I believe the OSM application can in theory go down
> to 3m. Drawing a field boundary along a road where the gap is less than
> 3 meters between the boundary (wall,fence) and the end of the road would
> therefore seem unrealistic.
>
> Should I try and draw the field boundary along the road in all
> situations or only do this when there is a large gap > 3m?
>
> If I don't draw the field boundary along the road should I link to the
> road or should I stop the boundary just short of the road?
>
> Some guidance would be appreciated as I don't want to link boundaries to
> roads if this could cause problems.
>
> Many thanks in advance.
>
> Regards
>
> Dudley
>
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL:
> <http://lists.openstreetmap.org/pipermail/newbies/attachments/20120407/6cfb2301/attachment-0001.html>
>
> ------------------------------
>
> _______________________________________________
> newbies mailing list
> [email protected]
> http://lists.openstreetmap.org/listinfo/newbies
>
>
> End of newbies Digest, Vol 62, Issue 2
> **************************************
--
_______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
