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Urban Ecosystems

, Volume 20, Issue 2, pp 497–509 | Cite as

Mapping forest structure and uncertainty in an urban area using leaf-off lidar data

  • Huan GuEmail author
  • Philip A. Townsend
Article

Abstract

Forests are important to nutrient cycling, hydrology, climate and aesthetics in urban ecosystems. Effective forest management in urban environments requires detailed data on the spatial distribution and structure of urban forests, but the lidar which are best for mapping the complexity of these forests are often unavailable or prohibitively expensive for municipalities. However, leaf-off small footprint lidar originally collected for topographic mapping are increasingly available, and will soon become accessible to forest managers in the U.S. through 3DEP (3D Elevation Program). In this paper, we demonstrated the opportunistic use of existing leaf-off lidar to map forest structure and associated uncertainties in Madison, Wisconsin and neighboring municipalities. Using empirical models, we were able to map five structural variables and aboveground biomass with accuracies comparable to or better than other studies using comparable data and with errors generally <20 % of the data range. Highest uncertainties in our forest structure maps occurred in residential neighborhoods and along forest edges. From the results, we present maps of forest structure and, to our knowledge, first of a kind pixel-wise uncertainty maps for an urban area. These maps provide the basis for a spatially comprehensive assessment of forest resources and are effective for urban inventory and change assessment. For example, the maps enabled comprehensive comparison of carbon storage by urban trees among cities, with a range in our study of 1.2 kg/m2 to 5.6 kg/m2, and with major variations due to differences in city development patterns and ages.

Keywords

Urban forests Forest structure Uncertainty Leaf-off lidar Carbon storage 

Notes

Acknowledgments

This research was funded by University of Wisconsin-Madison McIntire-Stennis Grant WIS01531. Sincere thanks to Aditya Singh for help in model analysis and Jordan Muss for lidar processing support. Thank you to Marty Dillenburg, Benjamin Spaier, Ryan Sword, Chase Wilson, Austin Pethan and Hannah Hubanks for assistance with fieldwork. We thank Fred Iausly and Kevin Connors (Dane County), Marla Eddy and Dave Davis (City of Madison), and Kirk Contrucci (Ayres Associates) for assistance in procuring lidar data. We also thank Matt Garcia and other members of Townsend Lab for helpful suggestions.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Forest and Wildlife EcologyUniversity of Wisconsin-MadisonMadisonUSA
  2. 2.Graduate School of GeographyClark UniversityWorcesterUSA

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