This example shows how to create canton boundaries consistent with lake boundaries using topojson-merge. To avoid losing information, --no-quantization is used when creating the initial unmerged topologies. Data from interactivethings/swiss-maps.
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Swiss Cantons & Lakes
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| license: gpl-3.0 |
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| .DS_Store | |
| build | |
| node_modules |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| } | |
| .feature--canton { | |
| fill: #bbb; | |
| } | |
| .feature--lake { | |
| fill: steelblue; | |
| fill-opacity: .8; | |
| } | |
| .feature :hover { | |
| fill: orange; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var color = d3.scale.category20c(); | |
| var path = d3.geo.path() | |
| .projection(null); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("ch.json", function(error, ch) { | |
| if (error) throw error; | |
| svg.append("g") | |
| .attr("class", "feature feature--canton") | |
| .selectAll("path") | |
| .data(topojson.feature(ch, ch.objects.cantons).features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| svg.append("g") | |
| .attr("class", "feature feature--lake") | |
| .selectAll("path") | |
| .data(topojson.feature(ch, ch.objects.lakes).features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(topojson.mesh(ch, ch.objects.cantons, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary boundary--cantons") | |
| .style("stroke-width", "1px") | |
| .attr("d", path); | |
| }); | |
| </script> |
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| .PHONY: all clean | |
| GENERATED_FILES = \ | |
| ch.json | |
| all: ch.json | |
| clean: | |
| rm -rf -- $(GENERATED_FILES) build | |
| build/VEC200_Commune.%: | |
| mkdir -p build | |
| curl -o $@ -3 'https://raw.githubusercontent.com/interactivethings/swiss-maps/2.1.0/src/V200/$(notdir $@)' | |
| build/cantons.shp: $(addprefix build/VEC200_Commune.,shp dbf prj shx) | |
| rm -f -- $@ | |
| ogr2ogr -f 'ESRI Shapefile' -where 'COUNTRY = "CH"' $@ $< | |
| build/lakes.shp: build/cantons.shp | |
| rm -f -- $@ | |
| ogr2ogr -f 'ESRI Shapefile' -where 'SEENR < 9999 AND SEENR > 0' $@ $< | |
| build/cantons-unmerged.json: build/cantons.shp | |
| node_modules/.bin/topojson \ | |
| -o $@ \ | |
| --no-quantization \ | |
| --id-property=+KANTONSNR \ | |
| -- cantons=$< | |
| build/lakes-unmerged.json: build/lakes.shp | |
| node_modules/.bin/topojson \ | |
| -o $@ \ | |
| --no-quantization \ | |
| --id-property=+SEENR \ | |
| -- lakes=$< | |
| build/%.json: build/%-unmerged.json | |
| node_modules/.bin/topojson-merge \ | |
| -o $@ \ | |
| --in-object=$* \ | |
| --out-object=$* \ | |
| -- $< | |
| ch.json: build/lakes.json build/cantons.json | |
| node_modules/.bin/topojson \ | |
| -o $@ \ | |
| --width=960 \ | |
| --height=500 \ | |
| --margin=10 \ | |
| --simplify=.5 \ | |
| -- $^ |
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| { | |
| "name": "anonymous", | |
| "version": "0.0.1", | |
| "private": true, | |
| "dependencies": { | |
| "topojson": ">=1.6.5 <2" | |
| } | |
| } |
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