November, 2012


Spatial Analysis

New approach for turn restrictions by Tim Hirrel.New approach for turn restrictions by Tim Hirrel.

Turn Restrictions Simplified

This guest article by Tim Hirrel takes a look at a new method for implementing turn restrictions in GIS street data. Turn restrictions (e.g. no right turn allowed or no u-turn allowed) are an important component of network data used for driving directions and logistics.   Tim Hirrel is the […]

GIS Learning

Inside page of the new Chinese passport showing a map of China that includes disputed areas.Inside page of the new Chinese passport showing a map of China that includes disputed areas.

The Tetchy Passport Map War Courtesy of China

China recently started issuing passports with an updated design to its citizens.  The redesigned passports have upset a number of China’s neighbors with the map produced on the inside pages.  Those watermarked pages show a map of China that includes areas of the region under dispute by several neighboring countries. […]

Maps and Cartography

The first cane map was created in 1893.The first cane map was created in 1893.

Cane Maps

Long before personal navigation technology became commonplace through the use of GPS enabled smartphones and other handheld devices, cane maps were an innovative way of carrying locational information.  The first cane map was created in 1893 for that year’s Columbian Exposition (the Chicago World Fair). The 1893 World Fair was held […]

Maps and Cartography

Change in share of votes between the Democratic and Republican candidates from 2008 to 2012.Change in share of votes between the Democratic and Republican candidates from 2008 to 2012. Source: NY Times.

Post-Election Maps for the 2012 Presidential Election

Now that the election has been definitively declared for President Barack Obama (although the electoral votes for Florida are still being decided), it’s time to look at post-election maps and analysis.  The presidential election was a close race this year with Obama leading with 60,794,790 popular votes (50.4%) to Romney’s 57,901,194 votes […]