On Fri, Mar 21, 2008 at 12:07 PM, Ralf Gerlich wrote:
> AnMaster wrote:
> > Good question, I guess combining them and manually fixing the problems
> would be too much
> > work. I got no really good solution. But the current coastlines are very
> bad in many cases.
> >
> > What about only using GHSSH for those coastlines around continents? With
> that I mean coast
> > line around, say, North and south America, Europe/Africa/Asia (that,
> apart from the Suez
> > channel, are connected), Australia and any islands, and simply discard
> any coastlines
> > inside these "blocks" and use vmap0 there. That is: don't trust how
> vmap0/GHSSH classify
> > the data. Would that be feasible?
>
> Feasible, as GSHHS explicitly makes the outer coastlines available and
> differentiates them from inner shorelines, but it wouldn't solve the
> problems with inconsistent waterways at the coastlines of continents.
>
> Even though that is a lot of work, manually adapting our VMAP0-based
> data to the GSHHS-data is the only solution I currently see.
Right, this is basically what we did for 0.9.8 and ended up with a bazillion
inconsistancies ...
Areas marked as lake/river in GSHHS but ocean in vmap0 will be entirely
skipped.
Areas marked as ocean in GSHHS and lake/river in vmap0 will be doubled up
and overlapped.
VMAP0 rivers may run short of the GSHHS coastline.
etc.
There's no combination of these two datasets you can do perfectly with an
automated system. You would need a tremendous amount of effort to visually
inspect the entire data set and resolve any problems manually.
Regards,
Curt.
--
Curtis Olson: http://baron.flightgear.org/~curt/
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