[HN Gopher] OSM River Basins
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OSM River Basins
Author : gregsadetsky
Score : 76 points
Date : 2023-08-30 12:53 UTC (10 hours ago)
(HTM) web link (amandasaurus.github.io)
(TXT) w3m dump (amandasaurus.github.io)
| coldacid wrote:
| Nice but it definitely needs to support waterway=stream as well.
| mannykannot wrote:
| In the American southwest, the map shows a dense network of
| waterways around Farmington NM, and extending roughly 100 miles
| E-W and 150 miles N-S, and a similar but smaller region between
| the Colorado river and the four corners. I would guess that this
| is an artifact of mapping, as the area is pretty arid, and
| perhaps a consequence of these being largely Navajo, Apache and
| Ute lands.
| ianburrell wrote:
| It does have some problems. The upper McKenzie River in Oregon is
| shown as separate drainage since there is a break in the river.
| There are multiple sections in that area that are separate.
| Bigger one is that the Columbia River is split at McNary Dam.
|
| I'm not sure what needs to be fixed in OSM.
|
| Maybe it needs to detect dams. Or rivers that don't end in the
| ocean or endoheric lake.
| flusensieb wrote:
| Some rivers (especially in the US) miss their waterway-line
| through lakes/reservoirs and the part crossing the dam. These
| need to be added.
|
| Edit: https://wiki.openstreetmap.org/wiki/Rivers Explains it
| quite well with some graphics.
| troyvit wrote:
| Cool it looks like the creator is looking for just this
| feedback here:
|
| https://community.openstreetmap.org/t/osm-river-basins-websi...
| [deleted]
| gregsadetsky wrote:
| More info: https://github.com/amandasaurus/osm-river-basins
| matkoniecz wrote:
| and https://community.openstreetmap.org/t/osm-river-basins-
| websi...
| digging wrote:
| Interesting to be able to see many waterways being extremely
| tightly wound and others straightforward over long distances. I
| wonder if it's an issue of data resolution or actual geography.
| phh wrote:
| That's beautiful. I'm impressed we can compute related components
| on a world map so fast. The interconnections everywhere are
| beautiful. If this data is reliable, you can go from west europe
| to east china with just 3 changes (largely helped by canals)
|
| It makes me want to make a remotely (4G) controllable solar-
| powered tiny boat, and see how far I can drive it, though this
| map lacks the unreachable discontinuities (dam)
| playingalong wrote:
| > compute so fast
|
| It could be and likely is pre-computed on server side.
| pmontra wrote:
| It's missing man made channels. Some natural waterways end in a
| channel which ends in another natural waterway. All of three
| should be connected but the channel in between breaks the
| connection and the channel is not marked on the map. Probably the
| first waterway ended up into another natural one before men made
| the channel, because water flows no matter what.
| Aachen wrote:
| Do you have an example?
|
| It sounds like either you're saying the website is missing a
| tag like waterway=ditch or you haven't seen the "include
| canals" button or so, but with an example it's probably easiest
| to tell which. The underlying database probably has the data
| you're missing
| mannykannot wrote:
| "Include canals" does not seem to distinguish between canals
| that have replaced natural drainage channels, and those that
| connect different watersheds - which may or may not be what
| you want. This is noticeable, for example, in the English
| midlands, where the major watersheds merge into one connected
| entity (maybe because of the network of pre-railroad
| navigation canals?)
| pmontra wrote:
| I didn't see the second radio button.
|
| The first one is "only waterway=river"
|
| The second one is "with waterway & name"
|
| It does not refer to canals but the effect is to also include
| them. Maybe all of them is too much but finding the only
| canal the merges two waterways could be difficult. No idea.
| samtho wrote:
| I was able to select waterway and canals and, in
| California, I was able to see prominent ones like the
| California aqueduct that runs from Tracy to LA and smaller
| ones like the south Folsom canal that runs from Lake Natoma
| to the former nuclear power plant Rancho Seco.
| sampo wrote:
| A map (and the data) of river drainage basins (American:
| watersheds) would also be interesting.
| mkl wrote:
| There are plenty of those:
| https://duckduckgo.com/?q=world+watershed+map&atb=v279-1__&i...
| sampo wrote:
| Maybe this site has the data as open source:
| https://www.hydrosheds.org/products
| tasseff wrote:
| You may find this useful: https://www.usgs.gov/national-
| hydrography/watershed-boundary...
| liotier wrote:
| A 30 seconds look at river basin connectivity around a place I
| know gives me plenty of JOSM fodder - highly efficient
| visualization !
| pbmonster wrote:
| Is there a connection between Rhine and Rhone somewhere? I always
| get the same color for them. Weird.
| lgeorget wrote:
| Do you have the canal option checked?
| https://en.m.wikipedia.org/wiki/Rh%C3%B4ne%E2%80%93Rhine_Can...
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(page generated 2023-08-30 23:01 UTC)