## NAME

v.reclass - Changes vector category values for an existing vector map according to results of SQL queries or a value in attribute table column.

## SYNOPSIS

v.reclass
v.reclass help
v.reclass input=string output=string [rules=string] [column=string] [type=string[,string,...]] [layer=integer]

### Parameters:

input=string
  Name of input vector
output=string
  Name of output vector
rules=string
  Full path to the reclass rule file
column=string
  The name of the column values of which are used as new categories. The column must be type integer.
type=string[,string,...]
  Select type
  Options: point,line,boundary,centroid
  Default: point,line,boundary,centroid
layer=integer
  Layer number
  Default: 1

## DESCRIPTION

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

## EXAMPLE

v.reclass input=land output=land_u type=boundary rules=land.rcl

the rules file contains :

    # land reclass file
    cat 1
    where use = 'E13' and owner = 'Jara Cimrman'
    cat 2
    where use = 'E14'

Produces a new vector area map land_u containing boundaries from land with area category values selected from database by SQL select statement:
select id from tland where use = 'E13' and owner = 'Jara Cimrman' changed to category 1;
values selected from database by SQL select statement:
select id from tland where use = 'E14' changed to category 2.

## NOTES

No table is created for reclassed layer if column option is used and column type is integer (there is nothing which could be written to the table).

## BUGS

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

## SEE ALSO

v.extract

## AUTHOR

R.L. Glenn, USDA, SCS, NHQ-CGIS
from v.reclass to v.db.reclass and later to v.reclass in 5.7 rewritten by Radim Blazek

Last changed: $Date: 2005/02/09 08:52:38 $

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