the proportional symbol map

How much is at one exact spot. The area of the circle is the value, not its width.

What it leaves outCircles overlap where things are crowded, which is exactly where the reader most needs to count them.

3 · geospatial · geo · rung 3 · what’s related

Flannery · shipped on the platform · ScatterplotLayer -- no shape yet

Two worked examples

This circle is twice as wide. Is it twice as much?

Before you lookWrite down your answer before anyone says the word 'area'.

civichexbin_la_311_5km.csv · 31 rows · 3 columns

request counts at 31 tile centres across Los Angeles

What to look atA circle at each exact spot, sized by the count. The AREA of the circle is the value — not its width, which is what these get read as.

This example draws itself with a small script. With scripting off you can still read every word on this page, and the file itself is at data/hexbin_la_311_5km.csv.

earth and spacedots_quake_epicentres.csv · 2,508 rows · 6 columns · showing 400 of 2,508 rows on this page; the file has all of them

earthquakes with a magnitude at each epicentre

What to look atSize each circle by magnitude and the big quakes finally become visible among the small ones.

This example draws itself with a small script. With scripting off you can still read every word on this page, and the file itself is at data/dots_quake_epicentres.csv.

the pool

Now build one yourself.

The pool opens with this file and this shape already drawn, so your first move is to change something rather than to start from nothing. Bring your own CSV if you have one. Nothing is uploaded anywhere — the chart is drawn in your browser, your work saves there, and it downloads as a picture or as a project file you can open again.

Open the pool → the proportional symbol map · hexbin_la_311_5km.csv