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  combinations
       (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  com-
       bination  down  to  the	combination containing less information.  From
       this the user can derive which band combinations are interesting to an-
       alyse.


       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)
