6533b850fe1ef96bd12a8259

RESEARCH PRODUCT

Mapping wild pear trees (Pyrus bourgaeana) in Mediterranean forest using high-resolution QuickBird satellite imagery

subject

description

Recent advances in spatial and spectral resolution of satellite imagery as well as in processing techniques are opening new possibilities of fine-scale vegetation analysis with interesting applications in natural resource management. Here we present the main results of a study carried out in Sierra Morena, Cordoba southern Spain, aimed at assessing the potential of remote-sensing techniques to discriminate and map individual wild pear trees Pyrus bourgaeana in Mediterranean open woodland dominated by Quercus ilex . We used high spatial resolution 2.4 m multispectral/0.6 m panchromatic QuickBird satellite imagery obtained during the summer of 2008. Given the size and features of wild pear tree crowns, we applied an atmospheric correction method, Fast Line-of-Sight Atmospheric Analysis of Spectral Hypercube FLAASH, and six different fusion ‘pan-sharpening’ methods wavelet ‘ a trous ’ weighted transform, colour normalized CN, Gram–Schmidt GS, hue–saturation–intensity HSI colour transformation, multidirection–multiresolution MDMR, and principal component PC, to determine which procedure provides the best results. Finally, we assessed the potential of supervised classification techniques maximum likelihood to discriminate and map individual wild pear trees scattered over the Mediterranean open woodland.