Comparison of QuickBird and SPOT 5 Satellite Imagery for Mapping Giant Reed

摘要

QuickBird (2.4 m resolution) and SPOT 5 (10 m resolution) multi-spectral satellite imagery were compared for mapping the invasive grass, giant reed (Arundo donax L.), along the Rio Grande in southwest Texas. The imagery had three bands (green, red, and near-infrared). Three subsets from both the QuickBird and SPOT 5 images were extracted and used as study sites. The same subsets were extracted from both images. The images were subjected to supervised image analysis. Accuracy assessments performed onQuick-Bird classification maps from the three sites had producer's and user's accuracies for giant reed that ranged from 92% to 100%. Accuracy assessments performed on SPOT 5 classification maps from the three sites had producer's and user's accuracies for giant reed ranging from 75.7% to 93.3%. The lower accuracies of the SPOT 5 image classifications were attributed to its coarser resolution.