I'm trying  Map rendering engine Version 2.  It seems rather slow, but the 
shorelines are rendered much more accurately.
I've also emailed Outdoor-Natural.
Thank you for your advice, Xavier.
Paul W

On Friday, 7 July 2023 at 18:31:43 UTC+1 Xavier wrote:

> On Fri, Jul 07, 2023 at 01:14:08AM -0700, P Wat wrote:
> >
> >On Thursday, 6 July 2023 at 16:01:18 UTC+1 Xavier wrote:
> >
> >> On Thu, Jul 06, 2023 at 12:46:59AM -0700, P Wat wrote:
> >> >On Wednesday, 5 July 2023 at 15:41:40 UTC+1 P Wat wrote:
> >> >
> >> >> Using OsmAnd+ 11.04 on Android 13.
> >> >> Bizarre rendering of features near sea level. Areas seemingly flooded
> >> >> (though obviously not actually). Problem is visible on west side of 
> the
> >> >> river from 50.384329, -3.597140 to about a mile upriver and at 
> another
> >> >> location about 1.6mi downriver.
> >> >> It is an issue which randomly occurs periodically at various 
> locations.
> >>
> >> With that said, issues with water boundaries "overflowing" can be an
> >> indication of broken/incorrect OpenStreetMap (OSM) data for the river
> >> edge at the spot where the overflow begins. So it is very possible
> >> that these overflow spots indicate that some fixing of the master OSM
> >> data is needed. However, properly fixing water booundaries in OSM is a
> >> non trivial exercise, so if you don't feel up to doing so you may want
> >> to contact a local OSM mapper to check the boundaries for issues and
> >> fix those that are found.
> >>
> >Xavier, thanks for your feedback.
> >Agreed the "overflow" anomalies are most likely due to errors in the
> >water-boundaries on OSM.
> >Correcting them is a "foreign country" to me.
> >
> >The true geometry of the land is visible for all to see on OSM
> >(OpenStreetMap).
> >Please could someone competent at editing OSM make the corrections? (They
> >could hardly make it worse!)
>
> You might have better luck finding an OSM mapper local to that area on 
> one of the OSM mailing lists 
> (https://lists.openstreetmap.org/listinfo).
>
> Suggestions:
>
> 1) Outdoor-natural 
> (https://lists.openstreetmap.org/listinfo/outdoor-natural)
>
> or 
>
> 2) The 'Talk-??' list most local to the geographical area where these 
> elements are mapped. I leave this selection to you to perform.
>
>
>

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