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Anna Jarocińska, Małgorzata Białczak and Łukasz Sławik

.05 between the field-estimated biophysical variables (discolouration and defoliation) and the vegetation indices values extracted from the image, in order to determine the strength of relationship between in-field and imaging variables. Next, the indices most strongly correlating with the biophysical variables were selected (correlation coefficient above 0.5 or below −0.5). The best correlations with discolouration and defoliation were those of mNDVI705, SIPI and PSRI. For these indices, the regression equation and the coefficients of determination R 2 were calculated

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Andrzej Sawicki, Justyna Sławińska and Jacek Mierczyński

References [1] ATKINSON J.H., An Introduction to the Mechanics of Soil and Foundations , McGraw-Hill, London 1993. [2] BAZANT Z.P., KRIZEK R.J., Endochronic constitutive law for liquefaction with cyclic loads , Proc. ASCE, J. Engrg. Mech. Div., 1976, 102, EM2, 225-238. [3] GUDEHUS G., A comprehensive constitutive equation for granular materials, Soils and Foundations , 1996, 36, No. 1, 1-12. [4] KOLYMBAS D., Introduction to Hypoplasticity, Advances in Geotechnical Engineering and Tunnelling , Balkema, Rotterdam/ Brookfield 2000. [5] SAADA A