<div dir="ltr">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. <br><br><br></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Jun 7, 2018 at 4:41 AM Rory McCann <<a href="mailto:rory@technomancy.org">rory@technomancy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 07/06/18 00:44, Kathleen Lu wrote:<br>
> The way I understand the use, the OSM data is used to identify areas <br>
> that are to be discarded. Data in those areas are discarded. Thus, the <br>
> OSM data is not kept either, and no OSM data in the final dataset. Thus, <br>
> there is no derivative database containing OSM data.<br>
<br>
You can look for areas in the dataset with no data, and construct OSM <br>
(water body) data from that.<br>
<br>
<br>
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