Graph Of Global Thermometers

[HiFast note:  EM made a couple of updates of his original post to the main graphics.  I’ve edited his post to concentrate on the products and less on EM’s excellent discussion of his process including his coding.  I will also repeat it here for the BLUF: GHCN v3.3 Thermometers Small DotThanks EM for the great work!]

Well, I’ve managed to make a rather better graph this time than last time. And via simpler machinations too 😉

Scatter Diagram of GHCN Stations LON vs LAT with Python

Big Empty in the center of South America and Africa. Thin in the Outback of Australia. North Asia a bit off. Canada with a big hole in the center. Alaska moth eaten. The poles sparse and the seas worse. Interesting visualization of thermometer density.

My first graph was modeled on an example that stuffed an array with two values then plotted the array. I wanted a plot of Longitude vs Latitude… and somewhere along the way thought I ought to be able to address individual data items in the plot call itself, skip the array. It worked.

I’m going to play around with adjusting the dot size smaller (so things are not just a blob as the big spots blend) and add some labels and such. Cut the range back to the actual limits of the data. That ought to keep me busy the rest of the evening. But this graph is good enough for you to see that there’s nearly nothing at sea or at the poles.

UPDATE – With Labels

Here’s one with some titles / legends added. The controls in the “dot” are many so I’ve not adjusted it yet.

GHCN v3.3 Thermometers w/headings


Well I couldn’t resist trying one more thing… so here it is with smaller dots. Now you can see the real density inside the continents.

GHCN v3.3 Thermometers Small Dot

Essentially we have lots of data from the USA, Germany, China, Turkey, Japan, South Korea and the South of Australia. Everywhere else, a bit thin.

[HiFast note:  Steven Fraser asked EM in the original post “What’s with the nearly horizontal line of sites in northeren (sic) Canada?”

That’s the former DEW line, now North Warning System radar sites.]

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