r.statistics(1)        Grass User's Manual	  r.statistics(1)



NNAAMMEE
       rr..ssttaattiissttiiccss  -	Category  or  object  oriented statistics
       (GRASS Raster Program)

SSYYNNOOPPSSIISS
       rr..ssttaattiissttiiccss rr..ssttaattiissttiiccss hheellpp rr..ssttaattiissttiiccss [[--cc]] bbaassee_=_n_a_m_e
       ccoovveerr_=_n_a_m_e mmeetthhoodd_=_n_a_m_e [oouuttppuutt_=_n_a_m_e]

DDEESSCCRRIIPPTTIIOONN
       _r_._s_t_a_t_i_s_t_i_c_s  is  a  tool,  where  different  class, resp.
       object oriented statistical analysis methods are possible.

       The methods are the following:


       [english] - [german]


       distribution - Verteilung in Prozent


       average - Durchschnitt


       mode - Modalwert


       median - Median


       average deviation - Durchschnittliche Abweichung


       standard deviation - Standardabweichung


       variance - Varianz


       skewness - Schiefe der Verteilung


       kurtosis - Relative Abflachung (-) oder Zuspitzung (+)


       minimum - Minimum


       maximum - Maximum


       sum - Summe

CCOOMMMMAANNDD LLIINNEE OOPPTTIIOONNSS
   FFllaagg::
       --cc     Values are taken from category lables of the cover-
	      ing-layer, instead of covering-layer itself.


   PPaarraammeetteerrss::
       bbaassee   Base raster map

       ccoovveerr  Cover raster map

       mmeetthhoodd Statistical method Options: distribution,  average,
	      mode,  median,  avedev, stddev, variance, skewness,
	      kurtosis, min, max, sum

       oouuttppuutt Name of the new layer (not  when	using  'distribu-
	      tion')

       The  calculations will be performed for areas with data of
       the covering-layers which belong in the base-layer  o  the
       same category.


       Setting	the  _-_c  flag the category lables of the covering
       raster layer will be used.  This  is  nice  to  avoid  the
       GRASS  limitation to interger in raster maps because using
       category values floating point numbers can be stored.


       The output-layer is a reclassified version  of  the  base-
       layer  with identical category values.  The results of the
       calculations are stored in the category labels of the out-
       put-layer.


       The  described  output  is valid for all calculations with
       exception of distribution. Here the  output  is	given  to
       stdout.	A file name eventually specified will be ignored.
       The result will be a table with three columns.  In the  1.
       column  are  the category values of the base-layer (a), in
       the 2. column the associated value of the cover-Layers (b)
       and in the 3. column the percentage of b from a. Example:

					1   124  23
					1   201  47
					1   273  30
					2   101  5
					2   152  16
					2   167  60
					2   187  19
					     .
					     .
					     .


RREEMMAARRKK
       The source code of average, mode and median was taken from
       some GRASS raster modules.

BBUUGGSS
       unkown

SSEEEE AALLSSOO
       _r_._n_e_i_g_h_b_o_r_s

AAUUTTHHOORR
       Martin Schroeder, Geographisches Institut Heidelberg, Ger-
       many

       _L_a_s_t _c_h_a_n_g_e_d_: _$_D_a_t_e_: _2_0_0_2_/_0_1_/_2_5 _0_5_:_4_5_:_3_4 _$



GRASS 5.0					  r.statistics(1)
