01734nam a2200193 a 450000100080000000500110000800800410001910000180006024501300007826001240020830000290033252010520036165000190141365300250143270000230145770000220148070000210150270000170152320046082015-01-07       2003    bl uuuu     u00u1 u    #d1 aCAMPOS, R. C.  aDeterminação da cor do solo a partir de dados radiométricos e sua relação com teores de hematita.h[electronic resource]  aIn: SIMPÓSIO BRASILEIRO DE SENSORIAMENTO REMOTO, 11., 2003, Belo Horizonte. Anais... São José dos Campos: INPEc2003  ap. 2443-2449.c1 CD-ROM.  aColor is widely recognized as a primary identifying parameter of soil. The physical, mineralogical, and chemical properties can be derived from assessing the subsurface color characteristics. The present research aimed to estimating the hematite content clay fraction, in laboratory, from data related to soil color obtained by using automatic devices. Fifteen subsurface soil samples from São Paulo State had their clay fraction hematite contents semiquantitavely determined by the association of chemical and physical methods and their colors evaluated in laboratory through measurements made with a spectro-radiometer. The radiometric data were used to the determination of soil color in L*a*b* and Munsell systems and to the calculation of reddish indexes (RI). The RI values show functional dependence of hematite contents and the best relation is verified with RI values derived from color determined in the L*a*b* system. Exponential models, developed from remote sensors, show themselves adequate in predicting the soil hematite contents.  aOxido de Ferro  aDados radiométricos1 aDEMATTÊ, J. A. M.1 aQUARTAROLI, C. F.1 aFORMAGGIO, A. R.1 aTISOT, D. A.