Changeset: 114622916
West Tytherley
Closed by etgg
Tags
changesets_count | 3997 |
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created_by | iD 2.20.2 |
host | https://www.openstreetmap.org/edit |
imagery_used | Bing aerial imagery |
locale | en |
Discussion
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Comment from conifermapper
Is this some sort of revenge thing or do you genuinely belive that grass pastures are farmland?
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Comment from etgg
Firstly, my only interest is in creating a more accrate map that better reflects the actual usage of the places being mapped. I only map places that I have been to in person or know well. Farmland is both pastoral and arable and pertains to all the land operated by a farm. A meadow is a very specific type of grassland that is not regularly grazed by livestock. Since from aerial imagery you cannot tell the difference (generally) between a true meadow and grass farmland the likelihood is that it is farmland by default. 70% of the UK is farmland which is made up of both pastoral and arable. Non-grazed meadows form a very small proportion of this figure so the default position should be that they are tagged as farmland first. Please see the wiki note on farmland here https://wiki.openstreetmap.org/wiki/Tag:landuse%3Dfarmland and the wiki note on meadows here https://wiki.openstreetmap.org/wiki/Tag:landuse%3Dmeadow and the wikipedia description of a meadow here https://en.wikipedia.org/wiki/Meadow
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Comment from SomeoneElse
It's possible to further classify farmland with an extra tag, such as "farmland=pasture" for farmland that is predominantly or currently pastoral. I added that as a slightly different colour to https://map.atownsend.org.uk/maps/map/map.html#zoom=16&lat=54.08448&lon=-1.04706 - that lighter green is regular farmland, but usually has sheep on it. None of that shows up here https://map.atownsend.org.uk/maps/map/map.html#zoom=14&lat=51.07093&lon=-1.62774 , because I suspect the farmland hasn't been further classified.
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Comment from etgg
Hi, thanks for taking an interest in the subject matter. Personally, where the grass fields in question are unknown (without an in person survey) if they are in use as pasture/grazing, or as set-aside (out of date terminology I know), or as a rotation crop to boost nitrogen for the next crop in that field then I would say they would be best tagged with crop=grass (as that covers all bases) rather than pasture meaning grazing for cattle/sheep/horses etc. To your second point - I think the question over how the many iterations of map styles and renderers out in existence across the web using openstreetmap data interpolate this classification system is secondary to the classification system of tagged land and especially the hierarchy of that tagging. In this instance I am proposing that the landuse=farmland tag (and crop=grass where appropriate) has a higher priority of use over the more blanket / vanilla use of just the landuse=grass tag. Happy to discuss this further in / outside of specific changesets though since it's a bit of a big topic....
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