Analysis of riparian vegetation loss in Hillsboro, Oregon City and Portland, Oregon from 1990-2008

  • Creator(s): Vivek Shandas
  • PI(s): Vivek Shandas
  • Originator(s): Vivek Shandas
  • Other researcher(s):
  • Dates of data preparation: Jan 1 1990 - Dec 31 2008
  • Data collection status: Study collection is completed and no new collection is planned
  • Data access: Online
  • Last update: Feb 14 2013 (Version 1)
<Citation>     <Acknowledgement>     <Disclaimer>    
Shandas, V. 2013. Analysis of riparian vegetation loss in Hillsboro, Oregon City and Portland, Oregon from 1990-2008. Portland-Vancouver Urban Long-Term Research Area. Forest Science Data Bank, Corvallis, OR. [Database]. Available: Accessed 2024-02-28.
Data sets were provided by the Forest Science Data Bank, a partnership between the Department of Forest Science, Oregon State University, and the U.S. Forest Service Pacific Northwest Research Station, Corvallis, Oregon. Significant funding for these data was provided by the National Science Foundation Long-Term Ecological Research program (DEB-02-18088).
While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available 'as is'. The Andrews LTER shall not be liable for damages resulting from any use or misinterpretation of data sets.
This project documents the extent of riparian vegetation loss during a period of rapid development (1990-2008) in three Oregon cities. Aerial photographs, at a 1-foot resolution, of the study cities were digitized, analyzed, and completed for four points in time (1990, 1997, 2002 and 2008). Stream locations and city boundaries were obtained from the Metro RLIS database (Metro, 2002). All the data were projected to North American Datum of 1983. The banding analysis was conducted to measure vegetation coverage in four riparian vegetation classes for all permanent streams and wetland features at eight buffer widths from streams (7.5 m, 15 m, 22.5 m, 30 m, 45 m, 61 m, 100 m and 200 m). Four vegetation classes analyzed were based on a two-by-two classification, adjacent vs. all, and woody vs. unmanaged. The ’adjacent’ classification includes all woody and unmanaged vegetation cover adjacent to stream within the buffer width, with adjacency determined by a 5 m separation distance (Schuft et al., 1999); while the ‘all’ classification includes all cover of a given vegetation class (either ‘woody’ or ‘unmanaged’) within a given buffer width, regardless of separation distance from other similar cover. These determinations produced the following four classifications: a) Adjacent woody: included trees and shrubs, within 5 m distance of a stream and/or other adjacent woody cover. b) Adjacent unmanaged: included adjacent woody, plus unmanaged herbaceous plants within 5 m distance of a stream and/or other unmanaged adjacent vegetation cover. c) All woody: included adjacent woody plus non-adjacent trees and shrubs. d) All unmanaged: included adjacent unmanaged, plus non-adjacent trees and shrubs.

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