Re: [Tagging] units and notations for depth

On Tue, Feb 19, 2019 at 5:19 AM Tony Shield wrote: > Quite right. For OSM purposes I suggest depth in metres, if water is > tidal=yes also tidal_range in metres. > > I can't think of any reason to try to replicate nautical charts and tide > tables. And when planning navigation I do not consider n

Re: [Tagging] units and notations for depth

Quite right. For OSM purposes I suggest depth in metres, if water is tidal=yes also tidal_range in metres. I can't think of any reason to try to replicate nautical charts and tide tables. And when planning navigation I do not consider not using formal navigation charts and tables specific to t

Re: [Tagging] units and notations for depth

On 2019-02-19 11:11, Tony Shield wrote: > Depth of water in tidal areas can vary enormously. People using depth for > navigation and general use would expect to use depth at MLWS (Mean Low Water > Springs) and add increments based on tide tables, I suggest that OSM does the > same. Use the tida

Re: [Tagging] units and notations for depth

Depth of water in tidal areas can vary enormously. People using depth for navigation and general use would expect to use depth at MLWS (Mean Low Water Springs) and add increments based on tide tables, I suggest that OSM does the same. Use the tidal tag and perhaps a tidal-range tag, in metres,

Re: [Tagging] units and notations for depth

On 2019-02-19 04:03, Graeme Fitzpatrick wrote: > Not opposition, but for tidal areas, isn't this going to have the same > problems of whether you mark the "coastline" at the high- or low-tide line? Coastline is MHW, that is settled isn't it? Water heights are more problematic though, because t

Re: [Tagging] units and notations for depth

On 19/02/19 14:03, Graeme Fitzpatrick wrote: On Tue, 19 Feb 2019 at 12:45, Warin <61sundow...@gmail.com > wrote: The wiki has no units for depth, I would suggest these be the same as height. Makes sense - default as m's, but can be marked as ft dependin

Re: [Tagging] units and notations for depth

On Tue, 19 Feb 2019 at 12:45, Warin <61sundow...@gmail.com> wrote: > The wiki has no units for depth, I would suggest these be the same as > height. > Makes sense - default as m's, but can be marked as ft depending on local standards > There are also problems with estimation and variability. >

[Tagging] units and notations for depth

The wiki has no units for depth, I would suggest these be the same as height. There are also problems with estimation and variability. Some are using the tilde mark '~' to indicate 'approximately'. Some are using '-' for between eg depth=0.5-0.7 for between 0.5 and 0.7. Any opposition or bett