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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.

KEYWORDS

vector, attribute table

SYNOPSIS

v.reclass
v.reclass help
v.reclass input=name output=name [rules=name] [column=name] [type=string[,string,...]] [layer=integer] [--overwrite] [--verbose] [--quiet]

Flags:

--overwrite
Allow output files to overwrite existing files
--verbose
Verbose module output
--quiet
Quiet module output

Parameters:

input=name
Name of input vector map
output=name
Name for output vector map
rules=name
Full path to the reclass rule file
column=name
The name of the column whose values are to be used as new categories
The column must be type integer or string
type=string[,string,...]
Type
Select type
Options: point,line,boundary,centroid
Default: point,line,boundary,centroid
layer=integer
Layer number
A single vector map can be connected to multiple database tables. This number determines which table to use.
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).

For dissolving common boundaries, see v.dissolve.

BUGS

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

SEE ALSO

v.dissolve, v.extract

GRASS SQL interface

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: 2008-04-10 07:40:25 -0700 (Thu, 10 Apr 2008) $


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