This has been a fun little experiment. Looking at the data, however, suggests caution. Some of the stations have been in operation long enough to have only a few of the sliding windows defined. Others have been operational for much longer. This makes it difficult to compare the aggregated numbers from the different different stations, which is what we're doing by creating the heat map.

Nevertheless, this does point to some interesting areas of future enquiry, and it provides a brief glimpse of what geographical information systems can provide and how to use them. They can add a geospatially informed edge to the modeling and analysis, which isn't possible with the data, tools, and techniques they bring to the table.

In this next chapter, we'll turn our attention to sifting through free-form textual data using topic modeling.