OpenStreetMap

Fields & Hedges

Posted by jpsa on 18 September 2012 in English (English)

Many surrounding areas have been getting fields filled in, so I thought I'd better do Teversham before it started looking like an embarrassingly empty gap in the map. This turned out to be a more complicated exercise than I'd expected!

There are several kinds of field boundary round here: tracks, roads, hedges & fences, drainage ditches, sometimes a change in ground level, or sometimes no boundary at all. Sometimes it's ambiguous and I've had to make judgement calls: often a fence will have become sufficiently overgrown to constitute an effective hedge for some of its length. Ditches, too, often have bushy stuff growing, more or less impenetrably, along at least one side.

Sometimes, too, I can't get close enough to a field boundary to be sure what it consists of, and nor is it clear from the aerial photgraphy. Mostly I've settled on a likely guess, but occasionally I've just had to leave the barrier out (but leave a gap between the fields).

Then there's the question of whether the field areas should share nodes with the barriers which surround them. After a bit of experimentation, I've settled on generally sharing nodes with hedges and fences, but to offset from ditches, roads & tracks. This reflects the reality that farmers generally seem to plough pretty much right up to hedges and fences, but not to ditches, roads or tracks. It also renders reasonably attractively.

Location: Teversham CP (S Cambs), South Cambridgeshire, Cambridgeshire, East of England, England, United Kingdom

Comment from Sanderd17 on 18 September 2012 at 12:46

Regarding the connection of nodes between fiels, I do agree with your views.

Streets and streams have a certain width, big enough to mention. So the ways representing them should represent the middle line, while the field already stop at the border of the way, not on the middle line.

For fences and hedges, it's different, as they normally have a very small width, they exactly represent the boundary of the field, so they can be mapped on the end nodes.

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Comment from dcp on 18 September 2012 at 14:54

I too agree with your thoughts. I, however, do not know how to tag certain barriers like a line of trees: In fact it may not even be a barrier as you can go through the line. Another tag I can't find is one to map a grass verge, i.e. that area that may separate a field from a hedge, road, etc. I suppose landuse=grass will do the job well enough. But what do you do when a verge has been planted with bushes? natural=scrub does the job but it is not natural, is it?

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Comment from robert on 21 September 2012 at 00:06

"natural=scrub does the job but it is not natural, is it?"

But then again nothing is in England. It was almost all thick forest until humans came along.

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