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johnjreiser/nj_counties.geojson

Last active February 5, 2023 20:14
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New Jersey counties in TopoJSON
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nj_counties.geojson
{
"type": "Topology",
"objects": {
"nj": {
"type": "GeometryCollection",
"geometries": [
{
"type": "Polygon",
"arcs": [
[
0,
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]
],
"properties": {
"id": "34037"
}
},
{
"type": "Polygon",
"arcs": [
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]
],
"properties": {
"id": "34031"
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{
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"properties": {
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{
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{
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"properties": {
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{
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"properties": {
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{
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]
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"properties": {
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"properties": {
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"properties": {
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},
{
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"properties": {
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{
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],
"properties": {
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{
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"type": "MultiPolygon",
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}
Raw
source.sh
#!/bin/bash
# get us topojson file
curl -o us.topojson https://gist.githubusercontent.com/cmdoptesc/4714c586f69425043ae3/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json
# extract NJ counties to GeoJSON
ogr2ogr -f GeoJSON nj.geojson us.topojson counties -where "id like '34%'" -lco COORDINATE_PRECISION=7
# install topojson-server (if not already installed)
npm install topojson-server
# convert the GeoJSON to TopoJSON
npx geo2topo nj.geojson > nj.topojson
# make pretty if desired (using https://stedolan.github.io/jq/)
jq . nj.topojson > nj.topojson.pretty
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