Open AccessEvaluation of High-Resolution Satellite Imagery for Assessing Rangeland Resources in South Texas
Author(s) -
A. Everitt,
Chin-Yi Yang,
D. Lynn Drawe
Publication year - 2006
Publication title -
journal of range management
Language(s) - English
Resource type - Journals
eISSN - 2162-2728
pISSN - 0022-409X
DOI - 10.2458/azu_jrm_v59i1_everitt
Subject(s) - rangeland , remote sensing , satellite imagery , vegetation (pathology) , satellite , geography , environmental science , cartography , physical geography , agroforestry , medicine , pathology , aerospace engineering , engineering
QuickBird satellite imagery was evaluated for differentiating among rangeland cover types on the Welder Wildlife Refuge in south Texas. The satellite imagery had a spatial resolution of 2.8 m and contained 11-bit data. Four subsets of the satellite image were extracted and used as study sites. Field spectral measurements made among the dominant vegetation types showed significant differences in visible and near-infrared reflectance. Unsupervised classification techniques were used to classify false color composite (green, red, and near-infrared bands) images of each study site. Accuracy assessments performed on the classification maps of the 4 sites had overall accuracies ranging from 79% to 89%. These results indicate that QuickBird imagery can be a useful tool for identifying rangeland cover types at a regional level.