Bizarre rendering in Nautical mode

[P Wat]

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.
Can someone:-
i) Rectify the problem here?
ii) Explain the cause?
iii) Explain how it is rectified?
Thanks.
PW

[P Wat]

Attached screenshot of part of the affected area

[Xavier]

Given that few of us are familiar with that area, it is hard for us to
know which water parts are "overflow".

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.

[P Wat]

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!)

[Dmytro Prodchenko]

Hello! Thank you for the feedback. 

I can reproduce the issues, but only with Map rendering engine set to Version 1. Please try to switch Map rendering engine to Version 2, in Menu – Settings – OsmAnd Settings –

[Xavier]

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.

[P Wat]

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

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