v.reclass(1)

1v.reclass(1)                  Grass User's Manual                 v.reclass(1)
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NAME

6       v.reclass   - Changes vector category values for an existing vector map
7       according to results of SQL queries or a value in attribute table  col‐
8       umn.
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KEYWORDS

11       vector, attribute table
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SYNOPSIS

14       v.reclass
15       v.reclass help
16       v.reclass   input=name  output=name   [rules=string]    [column=string]
17       [type=string[,string,...]]   [layer=integer]    [--overwrite]   [--ver‐
18       bose]  [--quiet]
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20   Flags:
21       --overwrite
22           Allow output files to overwrite existing files
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24       --verbose
25           Verbose module output
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27       --quiet
28           Quiet module output
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30   Parameters:
31       input=name
32           Name of input vector map
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34       output=name
35           Name for output vector map
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37       rules=string
38           Full path to the reclass rule file
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40       column=string
41           The  name of the column values of which are used as new categories.
42           The column must be type integer.
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44       type=string[,string,...]
45           Type
46           Select type
47           Options: point,line,boundary,centroid
48           Default: point,line,boundary,centroid
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50       layer=integer
51           Layer number
52           A single vector map can be connected to multiple  database  tables.
53           This number determines which table to use.
54           Default: 1
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DESCRIPTION

57       v.reclass allows user to create a new vector map based on the reclassi‐
58       fication of an existing vector map.
59       Rules file may contain on each row either pair:
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61       keyword value
62       (separated by space) or comment beginning by  #(hash).   Definition  of
63       new  category  begins  with keyword cat followed by new category value.
64       Keyword where specifies SQL where condition.
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EXAMPLE

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68       v.reclass input=land output=land_u type=boundary rules=land.rcl
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70
71       the rules file contains :
72       # land reclass file
73       cat 1
74       where use = 'E13' and owner = 'Jara Cimrman'
75       cat 2
76       where use = 'E14'
77        Produces a new vector area map land_u containing boundaries from  land
78       with  area  category values selected from database by SQL select state‐
79       ment:
80       select id from tland where use =  'E13'  and  owner  =  'Jara  Cimrman'
81       changed to category 1;
82       values selected from database by SQL select statement:
83       select id from tland where use = 'E14'  changed to category 2.
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NOTES

86       No  table  is  created for reclassed layer if column option is used and
87       column type is integer (there is nothing which could be written to  the
88       table).
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90       For dissolving common boundaries, see v.extract.
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BUGS

93       No table is created for reclassed layer if rules option is used.
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AUTHOR

99       R.L. Glenn, USDA, SCS, NHQ-CGIS
100       from  v.reclass to v.db.reclass and later to v.reclass in 5.7 rewritten
101       by Radim Blazek
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103       Last changed: $Date: 2007-05-18 10:30:19 +0200 (Fri, 18 May 2007) $
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105       Full index
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107       © 2003-2008 GRASS Development Team
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111GRASS 6.3.0                                                       v.reclass(1)