Past and Present

Created by Sepideh Miller/ @sepzilla

Overview of the Maps

  • Brief History of Maps
  • The London Cholera Epidemic of 1854
  • OpenStreetMap
  • CartoDB

Brief History of Maps

Eratosthenes's Map (200 B.C.)

Ptolemy's Map (150 A.D.)

T and O Map (12th Century)

  • Early Christian Map from Etymologiae
  • Jerusalem lies at the intersection of the T
  • Land surrounded by Ocean/Sea
  • References to a round Earth created ambiguity (Circle? Sphere?)

Mercator's Map (1569)

Mercator's Map (1584)

Longitude: A Difficult Problem

Determining longitude required an absolute measurement of time.

  • In 1615, Galileo proposed using the orbits of the four brightest moons of Jupiter (Io, Europa, Ganymede, and Callisto) to measure absolute time.
  • Pendulum clocks could not work at sea.
  • John Harrison, a carpenter, invented the marine chronometer.

The London Cholera Epidemic of 1854

Who was John Snow?

A character in George R. R. Martin's Game of Thrones?

He was an English physician who had a big problem in 1854.

Medicine in 1850s London

The miasma theory of disease was popular.

Louis Pasteur would not do his germ theory studies until 1860.

Broad Street Cholera Outbreak

On August 31, 1854, after outbreaks in other parts of London, a major outbreak of cholera reached Soho. Over the next three days, 127 people on Broad Street had died. By the end of the outbreak 616 would die.



OpenStreetMap is a community driven mapping project based on local knowledge. It is like the Wikipedia of maps in that it accepts data from many contributors, and users are free to use the data in various ways like designing apparel that uses maps.

Overpass Turbo


You can help whereever there is a humanitarian crisis.




CartoDB is a map visualization engine that can turn tables of data into beautiful maps.

CartoDB Data View

CartoDB Map View

CartoDB Customization

CartoDB Pop Up Creation

CartoDB Pop Up Map

Actual CartoDB Map


Regarding Measurement Blog
The Story of Maps by Lloyd A Brown
Galileo's Reputation Is More Hyperbole Than Truth
The Ghost Map by Stephen Johnson
PostGIS in CartoDB