Jill Hubley, a Brooklyn web developer whose last project involved mapping local chemical spills, made the chlorophyllous cartography with data from the 2005-2006 Street Tree Census. Zoomed out, it looks kind of like oodles of stained cells under a microscope:
![Atlas of NY Tree Species](http://www.lviz.org/wp-content/uploads/2015/05/a9ec5eb94-292x300.jpg)