Rory - I don't think you can, because the negative area is area with both
no ground elevation/displacement and no water body. There would be no way
to tell whether the negative area was water body data or simply no
displacement.



On Thu, Jun 7, 2018 at 4:41 AM Rory McCann <r...@technomancy.org> wrote:

> On 07/06/18 00:44, Kathleen Lu wrote:
> > The way I understand the use, the OSM data is used to identify areas
> > that are to be discarded. Data in those areas are discarded. Thus, the
> > OSM data is not kept either, and no OSM data in the final dataset. Thus,
> > there is no derivative database containing OSM data.
>
> You can look for areas in the dataset with no data, and construct OSM
> (water body) data from that.
>
>
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