Colin and Christoph, could you give some guidance about a couple of the specific situations that I brought up in the original post?
First, in the question on the help Q&A board, the other mapper wanted to remove the coastline from tidal parts of rivers in England , so that the end of the waterway=river would meet the coastline. It looks to me that this is contrary to standard mapping in England and many other places. But I can see why some people look at the waterway line out beyond the coastline and feel it needs the river area mapped. Would mapping the water area of the river all the way down to the mouth be a good solution? This would be extra work in the ID editor, but quite simple in JOSM. It would lead to having two ways on the riverbank from the mouth to the end of the coastline: both natural=coastline and natural=water (or waterway=riverbank), but then it would be easier to calculate the total surface area of a river include it's estuary and tidal portions, for example. It seems like this would be reasonable, if the coastline is considered to map the furthest inland limit of the marine environment (at high tide), and the river area plus the line of the waterway are mapping the longest extention of the river. Has this method been used extensively? -Joseph Eisenberg -------------------------------------------------------- Date: Mon, 03 Sep 2018 23:40:02 +0200 From: Colin Smale <colin.sm...@xs4all.nl> To: tagging@openstreetmap.org Subject: Re: [Tagging] Coastline for rivers, estuaries and mangroves? >On 2018-09-03 23:08, Christoph Hormann wrote: >> On Monday 03 September 2018, Colin Smale wrote: This is essentially the >> situation we have right now. Judgement of >> local mappers is usually fine (with the exception of political >> cases like the Rio de la Plata). Most problems occur because >> armchair mappers misinterpret the local situation or when >> inexperienced mappers are unaware of the significance of >> distinguishing between ocean and riverbank mapping. >> What guidance do we give to the local mappers? >What is currently written on the wiki which includes the proposal which >is linked to from the coastline documentation. >> Given a properly formulated rule-of-thumb, why should remote armchair >> mappers come to a different conclusion to local mappers in this case? >As said this is mostly due to misinterpreting imagery. That can account for a few metres either way (perpendicular to the shoreline), but not for the difference between tidal limit and a "convenient crossing point near the sea". That is purely a personal judgement, not misaligning imagery. After all, we are not disputing here the location of the sides of the river, but where we draw the line from one side of the river to the other. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
