[OSM-talk-ie] Corine Import - update

[Dermot McNally]

Hi Pat,

I'll echo what the other guys have said here - currently, peat bogs
have no special rendering on OSM and are rendered as a generic
"wetland". With so much new bog data coming, I have already been in
contact with Steve Chilton, the main cartographer working on the
Mapnik rendering, to discuss a more suitable style. As we don't map
for the renderer, this is OK - though of course, we do have to make
sure that we are rendering for the map :)

A further issue is one that Larry touched on - sometimes we will
disagree with the land cover as chosen by Corine. In particular, many
of the areas of "bog" seem to be a little unusual. The Great Sugar
Loaf in Wicklow can be seen to be shown as mostly bog whereas it's
actually mostly rocky.

This brings us to a point that we've already discussed on IRC - the
definition of a peat bog. Because our tagging uses the word "wetland",
some mappers have considered that only saturated bogs should be
so-tagged and that bogs should be considered impassable. But there are
a few different cases that we probably should plan to reflect in a
sub-tag. Today, we tag:

natural=wetland
wetland=bog

I propose using subtags for different types of bog, and I'll include
an ill-considered list below as a starter for discussion:

* Saturated bogs, impassable to pedestrians (bog=saturated)
* Worked bogs, being excavated for their turf (bog=worked). Do we need
to distinguish here between small-scale manual cutting and industrial
harvesting?
* Peat-hag terrain (bog=peat_hag)
* Peaty soil, heather and other bog plants, but not so water-logged as
to be impassable (not sure of a good tag here - some have suggested
that this is what "heath" is for, but does that reflect the peat
content?)


Before we start to overrule Corine and retag what it considers a bog
it would be very useful to reach our own consensus on what one is.

Cheers,
Dermot

On 8 February 2011 08:54, Patrick Flanagan <pfglen at gmail.com> wrote:
> Hi All
> Overall appearance good but density of rushes on open mountains appear
> way too high and will dimish clarity of hiking paths., Can anything be done
> to improve clarity in this respect?
> Pat Flanagan OSM mapper


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