you could
1. convert your sea to Multilinestring
2. explode that
3. convert the isles needed to Polygon again
..ede
On 10/5/2020 13:18, Rahkonen Jukka (MML) wrote:
> Hi,
>
> What if I would like to convert all the many holes in the sea polygon into
> islands? We have a tool in OJ that does something similar with inner rings by
> removing them (Remove holes and Remove small holes functions). What I am
> after is to select the inner rings of selected features and copy them into a
> new layer as outer rings. The simple tool could discard attributes but an
> advanced one could optionally copy at least the ID of the source polygon.
> Maybe also a "hole_id" could be generated for enabling unique values
> "main_id"+"hole_id".
>
> I know that I can make a polygon as large as the sea and compute the
> difference but sometimes it could be more convenient for users just to select
> and run "extract holes as polygons". Also, copying the inner rings vertex by
> vertex should be a fast and robust method. If some ring would make an invalid
> polygon it could skipped with a warning. With difference it could mean that
> the whole process fails.
>
> -Jukka Rahkonen-
>
>
>
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