"Image modelling of forest changes associated with acid mine drainage" by N.A. Walsworth and D.J. King
 

Aspen Bibliography

Image modelling of forest changes associated with acid mine drainage

Document Type

Article

Journal/Book Title/Conference

25

Volume

5

Issue

567

First Page

580

Last Page

1999

Publication Date

1999

Abstract

A planar cellular transition model was investigated as a predictive methodology for modeling tree canopy dynamics along a chemical contamination gradient adjacent to an acid mine. Stochastic raster transitions were developed as a function of both proximity to the tailings and local stem density neighborhood con®guration. Model inputs consisted of scanned and registered archival photographs that were segmented into three forest classes using two di􏰀erent apex delineation techniques, one incorporating double-aspect calculations and the other using a high- pass ®lter. The results for each were integrated over selected sample windows. The accuracy of the two techniques was compared using a synthetic data set. The double-aspect technique was better able to identify and delineate tree crowns in synthetic data with signi®cant noise and shadow representative of typical forest conditions. However, the window integration results were more visually interpretable when classes were derived from the high-pass technique. Application of these techniques to the archival photography and subsequent temporal analysis using the Mann± Krendall statistic revealed signi®cant forest degradation over a 40-year period nearer the tailings and within areas of mixed canopy types. 5 1999 Elsevier Science Ltd. All rights reserved.

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