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 corre-
       sponding attribute values of the map are changed to  the  subject  file
       category  value.  When all maps are completed a patch operation is per-
       formed.
       This program was designed to merge maps for areas that  have  the  same
       category  labels,  but  different category values 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 sub-
       ject 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 issu-
       ing 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)
