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



NNAAMMEE
       ii..ccccaa   -  Canonical components analysis (cca) program for
       image processing.
       _(_G_R_A_S_S _I_m_a_g_e _P_r_o_c_e_s_s_i_n_g _P_r_o_g_r_a_m_)

SSYYNNOOPPSSIISS
       ii..ccccaa
       ii..ccccaa hheellpp
       ii..ccccaa ggrroouupp==_n_a_m_e ssuubbggrroouupp==_n_a_m_e ssiiggnnaattuurree==_n_a_m_e oouuttppuutt==_n_a_m_e

DDEESSCCRRIIPPTTIIOONN
       ii..ccccaa is an image processing program that takes	from  two
       to  eight  (raster)  band  files and a signature file, and
       outputs the same number of raster band  files  transformed
       to  provide  maximum  separability of the categories indi-
       cated by  the  signatures.   This  implementation  of  the
       canonical  components transformation is based on the algo-
       rithm contained in the LAS image processing system. CCA is
       also known as "Canonical components transformation".


       Typically the user will use the _i_._c_l_a_s_s program to collect
       a set of signatures and then pass those	signatures  along
       with the raster band files to _i_._c_c_a.  The raster band file
       names are specified on the  command  line  by  giving  the
       group  and  subgroup  that were used to collect the signa-
       tures.


       The output raster map names are built by appending a ".1",
       ".2",  etc. to the output raster map name specified on the
       command line.

   PPaarraammeetteerrss::
       ggrroouupp==_n_a_m_e
	      Name of the imagery group  to  which  the  2  to	8
	      raster band files used belong.

       ssuubbggrroouupp==_n_a_m_e
	      Name  of	the  imagery subgroup to which the 2 to 8
	      raster band files used belong.

       ssiiggnnaattuurree==_n_a_m_e
	      Name of an ASCII file  containing  spectral  signa-
	      tures.

       oouuttppuutt==_n_a_m_e
	      Output  raster file prefix name.	The output raster
	      map layer names are  built  by  appending  a  ".1",
	      ".2",  etc.  onto  the _o_u_t_p_u_t name specified by the
	      user.


NNOOTTEESS
       _i_._c_c_a respects the current  geographic  region  definition
       and  the  current mask setting while performing the trans-
       formation.

SSEEEE AALLSSOO
       Schowengerdt, Robert A.	TTeecchhnniiqquueess ffoorr	IImmaaggee  PPrroocceessssiinngg
       aanndd  CCllaassssiiffiiccaattiioonn  iinn	RReemmoottee	SSeennssiinngg,  Academic Press,
       1983.


       _i_._c_l_a_s_s

       _i_._p_c_a

       _r_._c_o_v_a_r

       _r_._m_a_p_c_a_l_c

AAUUTTHHOORRSS
       David Satnik, GIS Laboratory, Central  Washington  Univer-
       sity
       Ali R. Vali, University of Texas

       _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.cca(1)
