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July 17, 2017 00:52
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An exterior rings issue with MLIT's shapefile
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| <!DOCTYPE html> | |
| <svg width="960" height="600"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/topojson.v3.min.js"></script> | |
| <script> | |
| var svg = d3.select('svg') | |
| // Render Tokyo area | |
| var projection = d3.geoMercator() | |
| .center([137, 34]) | |
| .scale(30000) | |
| .translate([-800, 1300]) | |
| var path = d3.geoPath() | |
| .projection(projection) | |
| d3.json('tokyo.json', function (error, jp) { | |
| if (error) throw error | |
| svg.append('path') | |
| .datum(topojson.feature(jp, jp.objects.cities)) | |
| .attr('fill', '#eee') | |
| .attr('d', path) | |
| svg.append('path') | |
| .datum(topojson.mesh(jp, jp.objects.cities, function (a, b) { | |
| return a === b | |
| })) | |
| .attr('d', path) | |
| .attr('fill', 'none') | |
| .attr('stroke', '#333') | |
| .attr('stroke-dasharray', '2,2') | |
| .attr('stroke-linejoin', 'round') | |
| }) | |
| </script> |
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| #!/usr/bin/env bash | |
| # Choose Tokyo (東京) and download the 2017 data | |
| # http://nlftp.mlit.go.jp/ksj/gml/datalist/KsjTmplt-N03-v2_3.html | |
| unzip -o -j N03-170101_13_GML.zip -d tmp | |
| shp2json -n --encoding sjis tmp/*.shp -o tmp/tokyo.ndjson | |
| geo2topo -n cities=tmp/tokyo.ndjson \ | |
| | toposimplify -p 0.00002 -f \ | |
| > tokyo.json |
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