On 16/12/2019 12:32, Andy Townsend wrote:
* 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.
+1
After several years mapping Northumberland (about 60% complete!), that's
almost exactly the same style I've landed on.
Adding boundaries and rivers first helps get a feel for the area, then
adding individual polygons is easier with the follow tool in JOSM.
Large areas of one polygon are a PITA to maintain later - e.g. if a
meadow is ploughed up, or a housing estate appears. (I know - I've
cursed my own previous less detailed mapping several times...)
Also to help with maintenance, I separate roads from landuse UNLESS in
upland areas where there may be less field boundaries but
barrier=cattle_grid visible which means the sheep really are in the
middle of the highway.
And, please don't chop up roads into little segments so one way can be
used in four area relations (my least favourite maintenance PITA). Your
future self will be happier if you draw separate lines! :-)
My own practice is to show a pattern of cultivation with different tags
such as farmland, meadow, scrub, heath. In Northumberland this can give
additional information at large scales as height limits the types of
farming which are viable as you rise inland from the coast.
And yes, farmers do indeed plough up grazing land and rotate crops - I
try to map what is visible from cycle survey, and different imagery
providers whilst accepting it's not going to be as canonical as a
housing estate!
TTFN,
James
James
--
James Derrick
li...@jamesderrick.org, Cramlington, England
I wouldn't be a volunteer if you paid me...
https://www.openstreetmap.org/user/James%20Derrick
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