On 4/21/19, Warin <61sundow...@gmail.com> wrote: > Arch = A hole though some feature, usually rock. Covered overhead and to > both sides, open at both ends.
This is natural=arch https://wiki.openstreetmap.org/wiki/Proposed_features/Natural_arch - as mentioned by Paul Allen above > archipelago = an island group or island chain place=archipelago - I recently updated this page but it's been in use since 2013 https://wiki.openstreetmap.org/wiki/Tag:place%3Darchipelago > basin = The tract of country drained by a river and its tributaries, or > which drains into a particular lake or area. Note need to be careful not to > confuse this with man_made=basin or sea basins. I asked about this a few months ago. Several people were against mapping drainage basins, because the verifiable boundaries can be mapped as natural=ridge, and the others are not verifiable. > Canyon: A gorge, relatively narrow but of considerable size ...(possibly tag > as gorge with > gorge=canyon?) The alternative, already suggested on some non-English pages, would be natural=canyon - used 163 times; or natural=valley with valley=canyon? I would map these as a node or as a linear way that follows the low ground or the waterway > Cap = ??? Misspelling for cape? Or a type of peak? No idea. > Col or gap (use saddle? And that is in OSM) = a col is the lowest point on a > mountain ridge between two peaks. Yes, "col" is the French word for saddle, a low point on a ridge. A gap is also usually a saddle (or sometimes a mountainpass=yes on a highway, sometimes a valley or gorge) > couloir (French: [ku.lwaʁ], "passage" or "corridor"), is a narrow gully with > a steep gradient in a mountainous terrain. Tag as a gully?? Natural=gully sounds fine. I know mountain climbers talk about these often, but there isn't a clear distinction from a gully or small valley. > Depression = A sunken place. Also called sink. The low point of one of these is the opposite of a peak - but usually they are only found in arid areas or karst, since a lake normally forms. We do have the approved tag natural=sinkhole for one common type of depression, which can work for places where a stream disappears underground as well. https://wiki.openstreetmap.org/wiki/Tag:natural%3Dsinkhole Most other sinks and depressions will be the site of an ephemeral lake; eg Badwater in Death Valley, lots of intermittent desert lakes in Australia. > Gully = natural watercourse, especially a hillside, It only carries water > after rain and its sides are generally steep. Usually one of the smallest > branches of a drainage system, and often associated with erosive action. Natural=gully is in use, but not very common. Many could also be mapped as an intermittent stream. If there are steep slopes natural=cliff or natural=earth_bank can be used. https://wiki.openstreetmap.org/wiki/Tag:natural%3Dgully > fjard = (Swedish: fjärd, IPA: [ˈfjæːɖ]) is an inlet formed by the marine > submergence of formerly glaciated valleys and depressions within a rocky > glaciated terrain of low relief. Fjards are characterized by a profile that > is shorter, shallower, and broader than the profile of a fjord. Never heard of this before! Wikipedia says: "A fjard is a large open space of water between groups of islands or mainland in archipelagos. " It's related to the word "fjord". It sounds like this would usually be a natural=strait or perhaps natural=bay? > Fjord ? Not in the data base??? Yet fjard is. Fjords are often tagged as natural=bay plus bay=fjord: https://wiki.openstreetmap.org/wiki/Tag:bay%3Dfjord > fumarole =is an opening in a planet's crust which emits steam and gases There are 2 proposals, both used less than 20 times: geological=volcanic_fumarole https://wiki.openstreetmap.org/wiki/Tag:geological%3Dvolcanic_fumarole natural=fumarole https://wiki.openstreetmap.org/wiki/Proposed_features/fumarole > massif = a section of a planet's crust that is demarcated by faults or > flexures. In the movement of the crust, a massif tends to retain its > internal structure while being displaced as a whole. The term also refers to > a group of mountains formed by such a structure. This was proposed but abandoned, used less than 20 times: natural=massif I'm not sure how a non-geologist could map one of these. It sounds like they are defined by faults and subsurface rock characteristics that are not really visible? > Mountain = A large natural elevation of the earth’s surface. Note peaks are > different from mountains, see below! Most mountains can be mapped as either a natural=peak (if the named features is a particular peak) or a natural=ridge (if the mountain is a linear feature with several peaks), or natural=volcano sometimes. > mountain_ridge = Use ridge? in OSM already Yes, natural=ridge is approved > Oasis =the combination of a human settlement and a cultivated area (often a > date palm grove) in a desert or semi-desert environment Just a place=village and various types of landuse and lancover around it, no? I think it will be obvious that it's an oasis if you see water, trees, farmland and landuse=residential in a region that is otherwise desert wilderness. > Plain = tract of country the general surface of which is comparatively flat > or slightly undulating. In extent generally not less than 2,500 hectares and > sparsely, if at all timbered. Probably not mappable except as a node. Many of these are large regions without clear borders. But a small plain might be mapped as a node, like a valley. > floodplain Use the above plain with plain=floodplain??? A floodplain is rather different. Defining a floodplain requires knowing the statistical risk that a certain area will be flooding in the next 10 or 100 or 1000 years, so it's not something that we can have in OSM. > range A series or line of mountain or hill ridges with or without peaks, in > which the crests are relatively narrow. Its minimum length is about 16 > kilometres This can be mapped as a natural=ridge if it's a continuous ridge line. There was also a proposal for natural=mountain_range but it's a little fuzzy to define the difference between a ridge and a range. They are both "sierra" in Spanish, for example. Old proposal: https://wiki.openstreetmap.org/wiki/Proposed_features/Mountains - also mentions massif > ravine = A deep narrow steep sided valley. I would think these could be either natural=gully or natural=valley or natural=gorge depending on size? > thalweg a line connecting the lowest points of successive cross-sections > along the course of a valley or river. The waterway=riverbank page says that waterway=river should be mapped along the thalweg: https://wiki.openstreetmap.org/wiki/Tag:waterway%3Driverbank This would also be the location I would map a natural=valley as a linear way - only in the rare situation that there is no river or stream in the valley, due to very dry climate or karst geology with underground streams. > -------------------------- > Water related > > Dry lake, often called a playa in the south western United States. Tag as a > lake, intermittent=yes/ephereral=yes??? +1 > Fen = one of the main types of wetland, fens are a kind of mire. Tag as a > wetland? wetland=fen is approved, but much less common than wetland=bog - so I suspect that many fens are mapped as natural=wetland + wetland=bog - https://wiki.openstreetmap.org/wiki/Tag:wetland%3Dfen > Sink (geography), also known as an alkali flat or sabkha, a desert basin > with no outlet which periodically fills with water to form a temporary lake. > Possibly tag as lake, intermittent=yes, ephemeral=yes. +1 > tarn = A tarn (or corrie loch) is a mountain lake, pond or pool, formed in a > cirque excavated by a glacier. Use OSM lake ??? +1 natural=water +water=lake - if you want, you could add lake=tarn as well? > ------------------ > Peaks are not necessarily mountains or hills!!! > The highest mountain in Australia, Mt Koscciszko is a bump in a bumpy > landscape .. it is not a 'peak'. A natural=peak is any summit or peak; that is, any point that is higher than the surroundings. Wikipedia: "A summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. The topographic terms acme, apex, peak (mountain peak), and zenith are synonymous." I would certainly call the high point of Mt. Koscciszko a natural=peak, because it's the highest point on the landmass. But each of the bumps on its slopes can also be appropriately tagged as a natural=peak, especially if they have unique names in use by locals. If a mountain has a name that refers to the whole range rather than a single peak, natural=ridge often works. But in the great majority of cases, the highest peak or summit is associated with the name of the mountain. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
