zero-server maps

commonplace web maps for 2018

• no server required, by gh-pages
• fast and small by mvt and tippecanoe
• neat visualization by Tangram

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examples

• Global Map Japan 2.2 / source
• Global Map USA 2.0 / source
• EuroGlobalMap 8.0 / source

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data development

"tippecanoe-fan-out" : the name of the process to develop the data.

use tippecanoe, and then extract the MVT data to make them static.

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tippecanoe-fan-out

1. Download the Shapefile
2. ogr2ogr -f GeoJSON ...
3. tippecanoe ...
4. "fan out"

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tippecanoe-fan-out

Step 1. is done in other repos without /vt$/ (e.g. hfu/gmjp22 for hfu/gmjp22vt)
Step 2. and 3. are in __convert__.rb in each repo.
Step 4. is in __fan_out__.rb in each repo.

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fan out?

• To extract the MVT files to the repo.
• By the Ruby script on the next slide.

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__fan_out__.rb

# ...
Dir.glob('*.mbtiles') {|fn|
  Sequel.sqlite(fn)[:tiles].each {|r|
    #...
    File.open("#{t}/#{z}/#{x}/#{y}.mvt", 'w') {|w|
      w.print Zlib::GzipReader.
        new(StringIO.new(data)).read
}}}

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TODO

• improve attribution (see LICENSE for the time being)
• improve scene.yaml (need love for data)
• work on more Global Map data