Hi Steve, thanks for your interest. Sorry that I have not maintained the code on this blog post. I no longer have access to the CSV file because I have let the paid subscription to Dropbox lapse. Also, the method described here is a little bit outdated, especially because the sf package was released since I wrote this blog post, which is a much improved interface for working with spatial data and making maps in ggplot2. I would recommend looking for a better solution than this little hack that I wrote. Try the following:

– https://stackoverflow.com/questions/60724391/add-ggplot-pie-chart-to-ggmap-map
– https://stackoverflow.com/questions/56497958/ggplot-sf-package-how-make-simple-pie-graph-on-map
– http://www.spectdata.com/index.php/2018/10/25/how-to-use-ggplot-to-plot-pie-charts-on-a-map/

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Yes, it definitely does account for the initial inputs and the ones at intermediate stages. So for example in the model, grain-fed beef would require inputs from the cereal sector, plus inputs from other sectors that are involved in beef production, such as heavy machinery, fuel, etc. Thanks for the input on the figure — I’ll try to make a new version of it where the symbols are separated slightly for better visuals.

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Thanks!

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