Measurement and Modeling of the Spectral and Directional Reflection Properties of Lichen and Moss Canopies
Both spectral and directional reflection characteristics of terrestrial surfaces are of interest for remote sensing applications. We report on detailed laboratory measurements of the Cladina stellaris and the Flavocentriaria nivalis lichens and the Racomitrium lanuginosum moss canopies carried out at the European Goniometer facility at the Joint Research Centre, Ispra, Italy. We present bi-directional reflectance factor data in the blue, green, red and near-infrared parts of the spectrum. The moss had enhanced backscatter in the visible spectrum and was strongly backscattering in the near infrared. We successfully fitted the low-dimensional parametric model of Rahman, Pinty and Verstraete to our experimentally determined bi-directional reflectance factors. By means of cross-validation, we assessed the number of randomly sampled data points necessary to guarantee reliable model inversions. We found that approximately l00 measurement points were needed for our experimental data. Finally, we applied bootstrap techniques to show that the root-mean-square modelling error was as low as 5.7% for our chosen targets and model. Our findings, combined with digital elevation models and atmospheric radiative transfer models may result in enhanced detection of lichens from optical satellite data.
Bibliographic Reference: Article: Remote Sens. Environ, Elsevier Science, 72 (1) pp 78-94
Record Number: 200012829 / Last updated on: 2000-11-03
Original language: en
Available languages: en