Publication Details

Year Published

2021

Publication

General Technical Report NRS-200-2021. Madison, WI: U.S. Department of Agriculture, Forest Service, Northern Research Station. 100 p.

Abstract

i-Tree is a suite of computer software tools developed through a collaborative public-private partnership. These tools are designed to assess and value the urban forest resource, understand forest risk, and develop sustainable forest management plans to improve environmental quality and human health. This report provides details about the underlying methods and calculations of these tools, as well their potential limitations. Also discussed are the history of i-Tree, its future goals, and opportunities to facilitate new science and international collaboration.

This report is a revision to one previously published in 2020 (https://doi.org/10.2737/NRS-GTR-200). It reflects updates to procedures and values.

The appendixes can be accessed through the links below.

Appendix 1: i-Tree Staff and Collaborators

Appendix 2: i-Tree Links

Appendix 3: Shading Coefficients

Appendix 4: Conversion Factors for Leaf Area to Biomass

Appendix 5: Conversion Factors for Shrub Volume to Biomass

Appendix 6: Invasive Plant Species

Appendix 7: Compensatory Value of Trees

Appendix 8: Average Energy Costs

Appendix 9: Energy Conservation Estimates for Buildings in non-U.S. Countries

Appendix 10: Biomass Equations

Appendix 11: Wood Density Values

Appendix 12: Volatile Organic Compounds (VOC) Emission Rates

Appendix 13: Equations for Tree Height, Crown Height, and Crown Width

Appendix 14: Partial List of Publications Referencing i-Tree Tools

Keywords

Citation

Nowak, David J. 2021. Understanding i-Tree: 2021 summary of programs and methods. General Technical Report NRS-200-2021. Madison, WI: U.S. Department of Agriculture, Forest Service, Northern Research Station. 100 p. [plus 14 appendixes]. https://doi.org/10.2737/NRS-GTR-200-2021.