What kind of data is the volcana data set and how to make similar dataset?

I am trying to make maps similar to what is at this link.

Looking at the dataset used, the 'volcano' dataset which is a stock data set in rstudio.

I am trying to figure out what the values in the dataset mean, and how I get data like this for an original location.

For reference to the volcano dataset, here is a link where it can be viewed without downloading. https://r-data.pmagunia.com/dataset/r-dataset-package-datasets-volcano

Thank you for your help in advance!

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