[OSM-talk] Coastlines

[Dan Karran]

On 8/15/06, Steve Chilton <S.L.Chilton at mdx.ac.uk> wrote:
> Data quality looks quite reasonable on this sample. I have made SVG
> (saved as PNG) of the mainland bit of the example below.
> See:
> http://wiki.openstreetmap.org/index.php/WikiProject_Isle_of_Man#Assistan
> ce

Moved to http://wiki.openstreetmap.org/index.php/WikiProject_Isle_of_Man#Coastline

> There are two roads that go in the sea (1 in Port Erin and 1 in Port St
> Mary) but local gps work and editing could cure that. On balance I would
> say "better in than out" (ie if upload has worked for whole of island
> then repeat in stages for other areas). Is projection an issue over
> larger areas?

The road in Port Erin is based not on GPS tracks but on the Landsat,
and the one in Port St Mary is the harbour I think. There are a couple
of other close calls from real GPS data, but they coastline around
those areas is easily fixed.

> NB: renderer (osmarender2) doesn't recognise all of linework as some is
> still in class= rather than highway= format.
> Maybe worthwhile to also check in a more (data) populated area. Has
> Douglas been mapped in detail? Maybe I'll have a look at that when I
> have time.

There are some bits around Douglas, but not as much as Port Erin/Port
St Mary yet. I should go through and recategorise PSM as Rob put a lot
of work into that and it'd be a shame for it not to show up when
rendered.


Cheers,
Dan

-- 
Dan Karran
dan at karran.net
www.dankarran.com