On 25-Sep-16 08:48 PM, Colin Smale wrote:
Where would the boundary be? How could we describe it objectively? In
low lying areas such as the Netherlands there are sometimes so called
winter dykes which give a sharp edge to the flood plain. Otherwise it
would all be a bit vague around the edges.
//colin
Problems of defining a boundary exist with river banks too.
Here is a document on part of a flood plain .. only about 60 kms long.
http://www.environment.nsw.gov.au/resources/floodplains/120163JemalongCondobolinFMP.pdf
Note that the document is copyright ... Yes boundaries are a 'bit
vague', they are a 'bit vague' for scrub, wood, sand etc too.
On 25 September 2016 12:30:50 CEST, Warin <[email protected]> wrote:
Hi,
There is a draft to tag floodplains using the key natural.
http://wiki.openstreetmap.org/wiki/Proposed_features/floodplain
My thinking is that this would lead to conflicts with other 'natural'
tags .. like natural=scrub than may be applied to the same area.
So .. what would be the best key to use for this feature/value?
I am thinking that as it is associated with a waterway (it must start to
flood from somewhere and that is usually a waterway) that the key
waterway should be used. It would have rendering similar to a lake - but
'intermittent' so dashed lines rather than a solid colour.
Thoughts?
{There is presently flooding in some areas of Australia, why my thoughts
have turned to this. All too soon it will turn to bushfires}
Sub tags could be used to tag frequency etc. These tags could also be
used on floodways that are already part of OSM mapping.. so should be
something like flood:frequency=10 years.
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