v.merge(1)	       Grass User's Manual	       v.merge(1)



NNAAMMEE
       vv..mmeerrggee	- Merges vector map files.
       _(_S_C_S _G_R_A_S_S _V_e_c_t_o_r _P_r_o_g_r_a_m_)

SSYYNNOOPPSSIISS
       vv..mmeerrggee
       vv..mmeerrggee hheellpp
       vv..mmeerrggee [ --mmvv] mmaapp==_n_a_m_e[,_n_a_m_e,...]  oouuttppuutt==_n_a_m_e ssuubbjj==_n_a_m_e

DDEESSCCRRIIPPTTIIOONN
       Program to read the _d_i_g___c_a_t_s file for each named map.  The
       program then compares the category label (NOT  the  value)
       to  the	labels in the named subject file. If the label is
       found in the subject  file,  the  corresponding	attribute
       values of the map are changed to the subject file category
       value.  When all maps are completed a patch  operation  is
       performed.
       This  program  was  designed  to merge maps for areas that
       have the same category labels, but different category val-
       ues associated with those labels.
       There are two flags for _v_._m_e_r_g_e:



   FFllaaggss::
       --mm     Use RAM to hold subject file category values.  This
	      may be faster than the default (use of disc files);
	      however,	memory may not be large enough for all of
	      the subject file.

       --vv     By default, only the name of the mapset  processing
	      is  sent	to standard output.  In verbose mode, the
	      user is given  additional  information  on  program
	      operations.




   PPaarraammeetteerrss::
	      Vector map--source for composite.

       oouuttppuutt==_n_a_m_e
	      New name assigned to vector composite map.

       ssuubbjj==_n_a_m_e
	      SUBJ file name.


NNOOTTEESS
       The program _v_._m_a_k_e_._s_u_b_j can be run prior to using _v_._m_e_r_g_e.
       _v_._m_a_k_e_._s_u_b_j will read the category labels of each  map  in
       its  list  and create a subject file of labels and values.
       Users may opt to create the subject file by other means if
       they wish.


       _v_._r_m_e_d_g_e  must  be  run on any mapsets in the _v_._m_e_r_g_e list
       prior to issuing the _v_._m_e_r_g_e command.  Common  edges  will
       need to be removed prior to the _v_._m_e_r_g_e operation.

SSEEEE AALLSSOO
       _v_._m_a_k_e_._s_u_b_j

       _v_._r_m_e_d_g_e

AAUUTTHHOORR
       R.L. Glenn, USDA, SCS, NHQ-CGIS



       _L_a_s_t _c_h_a_n_g_e_d_: _$_D_a_t_e_: _2_0_0_2_/_0_1_/_2_5 _0_5_:_4_5_:_3_5 _$



GRASS 5.0					       v.merge(1)
