Coastline Rendering?

[hanksims]

I'm sure this is something that you've considered, but how possible is it to render land/ocean using OSM coastline data?

[marceloprates]

I'm not sure, but intend to add support for this in the future. One possible solution is to use the coastline (which is a 1d curve) to split the map's boundary in two polygons, such that one corresponds to the continent and the other to the sea. The latter could be added to the "sea" layer, perhaps. I'll think about it.

[hanksims]

I'm out of my depth, here, but in case this is helpful: Splitting the map cleanly into two and only two polygons might not handle every case. Here's a sample of running my town zoomed-out with the "water" style using the tags 'natural': ['water', 'bay']:

.. and here's a screenshot of a similar view on OSM ...

You'd think that our bay would be covered with the "bay" tag, there, but it's not -- it's delineated by OSM coastline.

Anyway, thanks for the beautiful software!

[erkannt]

I had success by using 'query features' on the water in the openstreetmap.org web display. In my case the water was part of the English Channel and that is tagged with natural: strait. Added that to my water layer and got this. It did slow the script down quite a bit. The English Channel is quite a massive polygon ^^

[ushham]

I am having similar issues, I created a new layer object which I added to the layers dictionary: 'coastline': {'tags': {'natural': 'coastline', 'strait'}}

and

'ocean': {'tags': {'place': ['ocean', 'sea']}},

I got the tag names from here: https://wiki.openstreetmap.org/wiki/Tag:natural%3Dcoastline

You then need to include a line to define the colouring for coastline (I just copied and pasted what was already in the code for water): 'coastline': {'fc': '#a1e3ff', 'ec': '#2F3737', 'lw': 1, 'zorder': 2},

This has helped fill in some areas, but I am still missing some patches that should be covered in water

[hanksims]

For me that inverted things -- islands rendered as ocean:

[roxanidg]

Did someone solve the sea and ocean issue?

[hanksims]

Yes. See

https://github.com/marceloprates/prettymaps/pull/47

[chrstnbwnkl]

As far as I can tell the functionality to load the coastline from a shapefile introduced in #47 has been removed in #102 . I am still running into problems when trying to plot the ocean correctly in this example:

new_params_default = {'circle': None,
 'layers': {'beach': {'tags': {'natural': 'beach'}},
          #  'building': {'tags': {'building': True, 'landuse': 'construction'}},
            'forest': {'tags': {'landuse': 'forest'}},
            'green': {'tags': {'landuse': ['grass', 'orchard'],
                               'leisure': 'park',
                               'natural': ['island', 'wood']}},
            'parking': {'tags': {'amenity': 'parking',
                                 'highway': 'pedestrian',
                                 'man_made': 'pier'}},
            'perimeter': {},
            'streets': {'width': {'cycleway': 3.5,
                                  'footway': 1,
                                  'motorway': 5,
                                  'pedestrian': 2,
                                  'primary': 4.5,
                                  'residential': 3,
                                  'secondary': 4,
                                  'service': 2,
                                  'tertiary': 3.5,
                                  'trunk': 5,
                                  'unclassified': 2}},
            'water': {'tags': {'natural': ['water', 'bay']}}},
 'radius': 500,
 'style': {'background': {'fc': '#F2F4CB', 'zorder': -1},
           'beach': {'ec': '#2F3737',
                     'fc': '#FCE19C',
                     'hatch': 'ooo...',
                     'hatch_c': '#d4d196',
                     'lw': 1,
                     'zorder': 3},
           'building': {'ec': '#2F3737',
                        'lw': 0.5,
                        'palette': ['#433633', '#FF5E5B'],
                        'zorder': 5},
           'forest': {'ec': '#2F3737', 'fc': '#64B96A', 'lw': 1, 'zorder': 2},
           'green': {'ec': '#2F3737',
                     'fc': '#8BB174',
                     'hatch': 'ooo...',
                     'hatch_c': '#A7C497',
                     'lw': 1,
                     'zorder': 1},
           'parking': {'ec': '#2F3737', 'fc': '#F2F4CB', 'lw': 1, 'zorder': 3},
           'perimeter': {'fill': False, 'lw': 0, 'zorder': 0},
           'streets': {'alpha': 1,
                       'ec': '#475657',
                       'fc': '#2F3737',
                       'lw': 0,
                       'zorder': 4},
           'water': {'ec': '#2F3737',
                     'fc': '#a8e1e6',
                     'hatch': 'ooo...',
                     'hatch_c': '#9bc3d4',
                     'lw': 1,
                     'zorder': 3}}}

prettymaps.create_preset("sf_1", **new_params_default)

plot = prettymaps.plot((37.80868, -122.50402,), radius=6500, preset='sf_1')

Gives me

Am I missing something?