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



NNAAMMEE
       ii..ccccaa  - Canonical components analysis (cca) program for image process-
       ing.
       _(_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  indicated  by  the  signatures.  This implementation of the
       canonical components transformation is based on the algorithm 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  com-
       mand  line  by  giving the group and subgroup that were used to collect
       the signatures.


       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 signatures.

       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 transformation.

SSEEEE AALLSSOO
       Schowengerdt, Robert A.	TTeecchhnniiqquueess ffoorr IImmaaggee PPrroocceessssiinngg aanndd  CCllaassssiiffii--
       ccaattiioonn 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 University
       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)
