GRASS GIS: v.reclass

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.

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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