Coastlines about tilemaker HOT 9 CLOSED

Interesting question. I doubt that natural=coastline will be realistic to process on its own. The best approach might be for Tilemaker to support shapefiles, so that you can import (say) openstreetmapdata.com's water polygons. But that'll require both shapefile support and the ability to supply a bounding box to Tilemaker (so that it doesn't render the whole world by accident :) ).

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I doubt that natural=coastline will be realistic to process on its own

Provided there is at least some coastline in the extract, it's technically possible, relying on the orientation of the coastline. But this would be difficult, and it would be good to have shapefile support for Natural Earth and other sources

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I've now added shapefile support in a branch: https://github.com/systemed/tilemaker/tree/shapefiles

The configuration docs are updated to explain how it works, but in brief, you import shapefiles directly into a layer by specifying them in the JSON file. Shapefiles must be WGS84 (pure lat/long) and are clipped to the bounding box of the .pbf, unless you specify another bounding box.

Have a play and let me know how you get on. I'm hoping this will land in Tilemaker 1.2 so all feedback is very welcome.

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Tried making the branch but I can't link libshp apparently (misses the inclusion of shapefil.h) although I've installed it.

# ldconfig -p | grep libshp
    libshp.so.1 (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libshp.so.1

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It looks like it needs libshp-dev on Ubuntu. I've added that to the docs - try again?

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Ok, compiled.
I went to add in the default config.json

    "coastlines": {
  "minzoom": 11, "maxzoom": 14,
  "source": "/root/coast/water-polygons-generalized-3857/water_polygons_z7.shp",
  "simplify_below": 13, "simplify_level": 0.0003
                }
        },

It goes in segfault, the core (gdb tilemaker core) has

Core was generated by `tilemaker Arenzano---43144.pbf --output=arenzano.mbtiles'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f86cdd3294b in ?? () from /usr/lib/x86_64-linux-gnu/liblua5.1.so.0

File is http://osm-toolserver-italia.wmflabs.org/estratti/comuni/pbf/Arenzano---43144.pbf

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Hm. That works fine for me using the water_polygons_z7.shp file from openstreetmapdata.com and your .pbf. The error reported is a Lua one - are you using the default Lua script?

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I've added brief error-trapping to pick up any Lua syntax errors.

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Recompiled, now exits at the lua errors trap.

Error found in Lua script when reading node_keys - check your script for syntax errors.

I found my problem in the conversion, I'm a fool and deleted the process.lua, so it wasn't there... :-D

Edit: the conversion ends smoothly, I have yet to check if the tile is ok

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