Southern pine beetle infestation probability mapping using weights of evidence analysisThis article is part of a larger document. View the larger document here.
Weights of Evidence (WofE) spatial analysis was used to predict probability of southern pine beetle (Dendroctonus frontalis) (SPB) infestation in Angelina, Nacogdoches, San Augustine and Shelby Co., TX. Thematic data derived from Landsat imagery (1974–2002 Landsat 1–7) were used. Data layers included: forest covertype, forest age, forest patch size and percent slope. WofE predicted infestation probabilities were significantly higher at infestation locations, versus random locations (p<0.0001). Significantly more infestations occurred in the higher probability areas (p=0.002). Infestation size was not significantly correlated with probability (p=0.0528). Correlations were found between WofE probability and traditional SPB hazard rating, calculated from forest inventory data, using the Mason (1981) system (p<0.0001). WofE probability maps were used to produce current SPB three and five-class hazard rating maps for the study area. WofE was effective for predicting SPB hazard, utilizing existing, remotely-sensed data sets.