Isoline - Carbon Dioxide concentrations

http://www.jpl.nasa.gov/news/features.cfm?feature=2037

An isoline map is a map joining points that all have the same value of the variable that you are examining.  These values can be wind speed, temperature, elevation, and pressure to name a few.  This mapping technique allows for the analysis of large areas of data as long as the data exists for that area at multiple points.

The map above shows the isolines (the boundary between different colors) of total carbon dioxide concentrations for the entire globe.  This data was obtained from the Orbiting Carbon Observatory.  Knowing this distribution of carbon dioxide over the entire globe can be extremely beneficial for climate models and other atmospheric applications.