Kirk M. Stueve, Rachel E. Isaacs, Lucy E. Tyrrell, and Roseann V. Densmore. 2011. Spatial variability of biotic and abiotic tree establishment constraints across a treeline ecotone in the Alaska Range. Ecology 92:496–506.

Appendix D. Sampled points and manual classifications.

FIG. D1. Stratified random sample points used in the logistic regression analyses are denoted. The points represent visual interpretations between 1953 and 2005 identifying respective areas of no change (yellow circles) and tree establishment (red squares). The 2005 IKONOS image comprises the background.