Derek Swingley

Get total vertex count for a shapefile

I needed a quick way to get the total vertex count in a shapefile. The ogrinfo command includes vertex count in its output. This command: $ ogrinfo »

Using the Census API to get county FIPS codes

I came across a .csv file recently that had some data I wanted to see on a map but the .csv only had county names (formatted »

Data visualization 30ish years ago

First-hand account and enjoyable read about how data visualization was done a few decades ago: Data visualisation, from 1987 to today by Graham Douglas. I knew »

Better JavaScript string sorting with collators

Pop quiz: how do you sort an array of strings so that any numbers (stored as strings), are sorted in the correct order? That is, if »

Linear versus logarithmic scales

Stephen Few's recent post titled Logarithmic Confusion contains a succinct description of linear vs. logarithmic scales: units along a logarithmic scale increase by rate (e.g. »

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