On 5 October 2010 12:15, Richard Mann < richard.mann.westoxf...@googlemail.com> wrote:
> A greenfield site is one that is currently a field, so it should be > tagged as a field until it gets built on. Nothing should ever be > tagged "greenfield". > > A brownfield site is derelict land that was something once, but is now > nothing in particular until someone does something with it. A > "brownfield" tag would therefore make some sense, though I'd probably > leave it as landuse=industrial (or whatever else it was) and add > further tags to say that it's derelict. > > Richard > Don't totally agree with Brownfield definition. We're dealing tags which appear to be poorly derived from British terms used in the British Planning System (eg building houses). The UK Government tries to encourage development on land that has been "previously developed", and tries to avoid development on land that has never been built on. This advice to local council planners is found in national *"Planning Policy Statement 3: Housing * (PPS3)" which uses the term Greenfield but not Brownfield. In the UK the definitions are more or less as follows: *Greenfield can be defined as* "*land that has never been built on or where the remains of any structure or activity have blended into the landscape over time.*" *Brownfield is used to shorten the term 'Previously developed land" and can be defined as* "land that is, or was, previously occupied by a permanent structure (excluding agricultural or forestry buildings) and associated fixed surface infrastructure. As of summer 2010 it does not include 'greenfield' land associated with a building (eg Gardens behind a house were until this summer considered brownfield in the UK) Putting aside the British English definitions we have to look for uses in OSM. I think Brownfield would be useful for mapping current status of previously developed land, not currently used, and where the future use is unknown or not agreed upon. Greenfield...not sure about this one. I don't like the current OSM use. The current use of mapping planning permission of land that has not been developed seems bad practice. Planning Permission is often not acted upon, and we should be mapping 'whats on the ground' or a status that affecting the land (eg Nature Reserve). Planning Permission is doesn't impact the land unless acted upon, in which case the land should be tagged landuse=construction Jason
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