“The choropleth map provides an easy way to visualize how a measurement varies across a geographic area or it shows the level of variability within a region.” – Wikipedia
Its an easy, colorful, effective and simple data visualization. At Janaagraha we use them visualize ward level data of Bangalore. A week back I thought it would be useful for others too and hence wrote a small script that could be used by anybody to create choropleth maps for Bangalore.
I wrote the initial script and then Anand helped me by adding more features. Its no where near completion. You can help us to resolve issues or by suggesting features.
Check some choropleth images created using the script.
BBMP Bangalore Election Results 2010 – Party wise breakup
Legends: Saffron for BJP, green for INC, yellow JDS, white for independents, purple for others.
BBMP Bangalore 2010 Elections – Gender ratio
Legends: Blue for male candidates, light pink for female candidates, dark pink for female candidates (reserved).