I tend to map to field boundaries: it's all farmland in my view, just not necessarily productive. In particular strips of grass around arable may be a short-term consequence of various subsidy schemes, or game cover crops. Many ditches are there to improve the drainage of the fields so I'd see them as an integral part of farmland. Similarly hedges, although now protected, were an essential means of stock control in the days when many farms were mixed (as they were in my childhood) and fields may have regularly rotated between pasture & arable.
One type of vegetation on unproductive farmland which is quite common is "tall herb". These might be the very unwelcome swathe of nettles in a field corner where the plough cant reach, or thistles & Great Willowherb along a slope down to a stream (these are classes C3.1 & C3.2 in the Phase 1 habitat classification, see wiki <https://wiki.openstreetmap.org/wiki/Plant_Community/UK_Phase_1_Habitat_Classification>), but also stands of Japanese Knotweed or Rosebay Willowherb. They are distinct from scrub because they die down in winter, although dead stems may remain. Jerry On Mon, 16 Dec 2019 at 12:34, Andy Townsend <ajt1...@gmail.com> wrote: > On 16/12/2019 11:59, Gareth L wrote: > > I’m all for using a polygon per field, but am unsure what to do at the > boundaries. Do I make 2 field polygons meet? Or leave a gap as there’s a > track/hedge/fence/small coppice/ ditch/drain ? I’m probably not going to be > able to map the boundary particularly accurately in a first pass, so would > rather omit than put in inaccurate barriers > > > If it helps, here's what I tend to do: > > - Firstly, I only tend to add farmland etc. after I've added fences, > walls, ditches, gates, bits of woodland etc. (it's just easier that way > around). > - If the crop extends right up to the hedge, I'd tend to have the > hedge sharing nodes with both fields. > - If there's a ditch, track or other separating feature I'd try and > draw the hedges either side (if they exist) and have the farmland not > sharing nodes with the ditch but with the hedge (if it exists). Similarly > I wouldn't attach farmland to roads. > - If there's an uncultivated strip around the edge of the field I > wouldn't tend to include that in the "field". Similarly if an area is left > as scrub (perhaps to wet for crops), I'd map as scrub. > > None of this is definitive - people have different approaches. If you > want examples of the above, have a look in my changeset history from > 3 > months ago in the East Riding of Yorkshire for example > https://www.openstreetmap.org/changeset/75049826 etc. > > Best Regards, > > Andy > > > _______________________________________________ > Talk-GB mailing list > Talk-GB@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-gb >
_______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-gb
