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How do you convert GeoJSON data to TopoJSON?


Topojson files are often smaller than geojson and the conversion allows you to incrementally simplify a dataset, if you wish.

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Why the gdal tag? –  blah238 Jan 3 '13 at 18:28
Gosh, good question. Not sure what I was thinking on that one :) Removed. –  Jeff Jan 3 '13 at 20:53
Step 3: Convert the data: topojson -o output_file.json input_file.json not working!!!!!!!!!!!! –  user21773 Sep 6 '13 at 17:00
topojson -o output_file.json input_file.json works for me under 1.1.0 and 1.4.0. Perhaps you can ask a formal question on here with more info on the problem you're having? Cheers! –  Jeff Sep 6 '13 at 18:09

1 Answer 1

up vote 19 down vote accepted

Glad you asked, oh handsome OP.

Install topojson

From the command line (Mac OSX 10.8, assumes homebrew installed):

brew install node.js
npm install -g topojson

Convert The Data

topojson -o output.json input.json
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