Counties using Mike Bostock's most excellent us-atlas.
Small difference: "make counties.json" will preserve properties.STATE & properties.COUNTY
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March 11, 2017 21:35
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counties1
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| gz | |
| shp |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>counties1</title> | |
| <style> | |
| body { | |
| font: 20px sans-serif; | |
| } | |
| path { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| #info { | |
| position: absolute; | |
| top: 20px; | |
| left: 600px; | |
| } | |
| </style> | |
| <body> | |
| <div id="info"></div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.min.js"></script> | |
| <script> | |
| var width = 960, height = 500; | |
| var path = d3.geo.path(); | |
| var info = d3.select("body").append("div") | |
| .attr("id", "info"); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("counties.json", function(error, data) { | |
| if (error) throw error; | |
| features = topojson.feature(data, data.objects.counties).features; | |
| svg.selectAll("path") | |
| .data(features) | |
| .enter() | |
| .append("path") | |
| .attr("d", path) | |
| .on("mouseover", function(d) { var p = d.properties; info.html(p.COUNTY + ", " + p.STATE + "<br>FIPS: " + d.id) }); | |
| }); | |
| </script> |
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| # Create counties.json preserving county name & state 2-character ID | |
| all: counties.json | |
| # Use Mike Bostock's most excellent us-atlas (rest of the makefile is equivalent) | |
| counties.json.orig: | |
| cd ../us-atlas; make topo/us-counties-10m-ungrouped.json | |
| cp ../us-atlas/topo/us-counties-10m-ungrouped.json counties.json.orig | |
| gz/countyp010_nt00795.tar.gz: | |
| curl 'http://dds.cr.usgs.gov/pub/data/nationalatlas/$(notdir $@)' -o $@ | |
| shp/us/counties-unfiltered.shp: gz/countyp010_nt00795.tar.gz | |
| rm -rf $(basename $@) | |
| mkdir -p $(basename $@) | |
| tar -xzm -C $(basename $@) -f $< | |
| for file in $(basename $@)/*; do chmod 644 $$file; mv $$file $(basename $@).$${file##*.}; done | |
| rmdir $(basename $@) | |
| # remove water counties (e.g., Great Lakes) | |
| shp/us/counties.shp: shp/us/counties-unfiltered.shp | |
| rm -f $@ | |
| ogr2ogr -f 'ESRI Shapefile' -where "FIPS NOT LIKE '%000'" $@ $< | |
| counties.json: shp/us/counties.shp | |
| mkdir -p $(dir $@) | |
| topojson \ | |
| -o $@ \ | |
| --no-pre-quantization \ | |
| --post-quantization=1e6 \ | |
| --simplify=7e-7 \ | |
| -p STATE,COUNTY \ | |
| --id-property=+FIPS \ | |
| -- $< |
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