Canadian Forest Service Publications
Automated stream planform mapping: a test study. 1999. Paradine, D.; Leckie, D.G.; Jay, C. Pages 387-394 in D.A. Hill and D.G. Leckie, Editors. International forum: automated interpretation of high spatial resolution digital imagery for forestry, Proceedings: Symposium. February 10-12, 1998, Victoria, British Columbia. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, BC.
Issued by: Pacific Forestry Centre
Catalog ID: 5186
Availability: PDF (download)
The nature of streams and their fish habitat is now a critical parameter to forest management. Mapping of the main features of stream courses is valuable baseline information for channel assessment and fisheries surveys, determining stream classes for prescribing logging setbacks and monitoring changes over time due to natural events or logging activity.
Eighty centimeter CASI imagery was acquired over Tofino Creek on the west coast of Vancouver Island, British Columbia. Using a spectral angle mapping algorithm, seven surface types were classified (deep water, shallow water, sand, gravel and cobble, woody debris (e.g., logs), conifer and deciduous). Comparison with ground truth taken within days of the imagery indicates general agreement of surface types and accuracy estimations greater than 80 percent for most classes. Individual logs and piles of woody debris were consistently detected. Problems do arise within shadowed areas, boundaries of stream features and forest and with some zones of sand, gravel and cobble.