False assumptions are hard to block once you get a look at Daniel P. Huffman 's color-coded map of profanity on Twitter(original PDF here). Using a sample of 1.5 millon geocoded tweets from last ...

Different maps can show geographical data in different ways. Chloropleth maps use shades of colour to show variations in data over wide areas. Isoline maps join places that share a value. Dot maps ...

Isoline maps join places that share a value. Dot maps can show distribution or density. Proportional symbol maps show different values with changing sizes of circles or other symbols.