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i-Tree is a collection of software programs for urban forestry that anyone can use. It was designed and developed by the USDA Forest Service to place a value on urban forest ecosystem services such as pollution removal, carbon storage, avoided carbon emissions, and avoided storm water runoff. I-Tree provides baseline data so that the growth of trees can be followed over time, and is used for planning purposes. Reports are based on tree inventories of species, DBH (diameter at breast height) and tree height. I-Tree is peer-reviewed and has a process of ongoing collaboration to improve it.


I-Tree began in 2002 as survey of a sample of urban forest to simulate taking a tree inventory of an entire urban forest. It then added hand held devices for efficient inventory of street trees. The current version of i-Tree allows for several sources of data to be used, such as National Land Cover Data, Google Maps, and tree inventories. Some versions allow for continuous data on air pollution and meteorology in order to average the results for a more accurate answer.

The current version uses groundwater capture, building energy savings, air pollution benefits, carbon sequestration, homeowner value, and pest detection.

See also[edit]


Researchers using i-Tree have examined:

  • The benefits of urban trees[1]
  • Selecting the best tree planting locations[2]
  • Storm damage to urban forests[3]
  • Potential bird habitats[4]
  • PM2.5 removal and health effect[5]



  1. ^ Nowak, 1996.
  2. ^ McPherson, 2008.
  3. ^ Thompson, 2012.
  4. ^ Lerman, 2014.
  5. ^ Nowak, 2013.


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