The above map shows the approximate number of street trees per borough in London in 2011. The darker the green the more street trees there are in that borough. Not surprisingly the centre of London has the fewest trees and the suburbs have the highest numbers. All data and blank borough map are available from the London Data Store. Below is the same map with tree numbers in 2007.
Because it is difficult to see the difference between the above two maps I calculated the percentage change in street trees for each borough between 2007 and 2011 and put these figures on the below map. White indicates little or no change, pink indicates a small decrease in the number of street trees and red indicates a large decrease, green indicates an increase in the number of trees.
This makes it easier to see the change, there is still a potential problem with accessibility for people with colour blindness.
This blog includes:
Scripts mainly in Python with a few in R covering NLP, Pandas, Matplotlib and others. See the home page for links to some of the scripts. Also includes some explanations of basic data science terminology.