Using topojson.merge to merge states & provinces into a single feature from the Natural Earth 1:10,000,000 Admin 1 dataset.
Turning off pre-quantisation entirely avoids artefacts, and post-quantisation doesn’t affect the merge algorithm.
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Quantised States
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| .DS_Store | |
| build | |
| node_modules |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-opacity: .5; | |
| stroke-width: .5px; | |
| pointer-events: none; | |
| } | |
| .land { | |
| fill: #222; | |
| stroke: orange; | |
| } | |
| .border { | |
| fill: none; | |
| stroke: blue; | |
| stroke-width: 1px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 960; | |
| var projection = d3.geo.mercator() | |
| .scale(width / 2 / Math.PI) | |
| .translate([width / 2, height / 2]) | |
| .precision(.1); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| d3.json("world.json", function(error, world) { | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.merge(world, world.objects.states.geometries)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.states, function(a, b) { return a !== b; })) | |
| .attr("class", "border") | |
| .attr("d", path); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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| GENERATED_FILES = \ | |
| world.json | |
| all: $(GENERATED_FILES) | |
| clean: | |
| rm -rf -- $(GENERATED_FILES) | |
| .PHONY: all clean | |
| build/ne_10m_%.zip: | |
| mkdir -p $(dir $@) | |
| curl -o $@ "http://www.nacis.org/naturalearth/10m/cultural/ne_10m_$*.zip" | |
| build/ne_%_admin_1_states_provinces.shp: build/ne_%_admin_1_states_provinces_shp.zip | |
| mkdir -p $(dir $@) | |
| unzip -od $(dir $@) $< | |
| for file in $(dir $@)/ne_$*_admin_1_states_provinces_shp.*; do mv $$file $(dir $@)/ne_$*_admin_1_states_provinces"$${file#*_shp}"; done | |
| touch $@ | |
| world.json: build/ne_10m_admin_1_states_provinces.shp | |
| node_modules/.bin/topojson \ | |
| -o $@ \ | |
| --q0 0 \ | |
| --q1 1e2 \ | |
| --simplify-proportion .1 \ | |
| -- states=$< |
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| { | |
| "name": "anonymous", | |
| "version": "0.0.1", | |
| "private": true, | |
| "dependencies": { | |
| "topojson": "1" | |
| } | |
| } |
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