i.oif(1)	       Grass User's Manual		 i.oif(1)



NNAAMMEE
       ii..ooiiff  -  Calculates  Optimum  Index Factor for LANDSAT TM
       bands 1,2,3,4,5 and 7
       _(_G_R_A_S_S _s_h_e_l_l _s_c_r_i_p_t_)

SSYYNNOOPPSSIISS
       ii..ooiiff
       ii..ooiiff hheellpp
       ii..ooiiff ttmm11 ttmm22 ttmm33 ttmm44 ttmm55 ttmm77

DDEESSCCRRIIPPTTIIOONN
       _i_._o_i_f calculates the

	 OOppttiimmuumm IInnddeexx ffaaccttoorr ((OOIIFF)) for all LANDSAT TM band  com-
       binations  (LANDSAT TM 1,2,3,4,5,7 without termal band 6).


       The result is a ranked list, which shows  the  information
       content	for  all possible combinations (20).  The list is
       ranked from the best combination down to  the  combination
       containing  less  information.	From  this  the  user can
       derive which band combinations are interesting to analyse.


       Calculation (after CHAVEZ et al. 1984):

		  Sum of Standard deviations of 3 bands
	   OIF = ------------------------------------------------
		  Sum of ABS(correlation coefficients of 3 bands)



       Ref.:  Jensen: Introductory digital image processing 1996,
       p.98 ISBN 0-13-205840-5



AAUUTTHHOORR
       Markus Neteler

       University of Hannover, Germany

       neteler@itc.it

       _L_a_s_t _c_h_a_n_g_e_d_: _$_D_a_t_e_: _2_0_0_2_/_0_1_/_2_5 _0_5_:_4_5_:_3_3 _$



GRASS 5.0						 i.oif(1)
