Want to See Every Tree in America?

We may sing about purple mountains and amber grains, but one of America's most vital resources is its vast amount of carbon-catching, oxygen-spewing trees. Now, after six years of effort, NASA knows how many we've got.

Josef Kellndorfer and Wayne Walker of Woods Hole Research Center worked in conjunction with the National Geological Survey and US Forest Service to catalog a mix of data gleaned from space-based radar, satellite sensors, computer models, and old-fashioned tree counting. The map above shows the total amount of woody biomass in the USA. It's displayed at a 30 meter resolution, where every four pixels constitutes an acre and every ten represents a hectare. [NASA Earth Observatory via Business Insider via Geekosystem]