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

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

vector, reclassification, attributes

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

--overwrite
 
Allow output files to overwrite existing files
--help
 
Print usage summary
--verbose
 
Verbose module output
--quiet
 
Quiet module output
--ui
 
Force launching GUI dialog

input=name [required]
 
Name of input vector map
 
Or data source for direct OGR access
layer=string
 
Layer number or name
 
Vector features can have category values in different layers. This number determines which layer to use. When used with direct OGR access this is the layer name.
 
Default: 1
type=string[,string,...]
 
Input feature type
 
Options: point, line, boundary, centroid
 
Default: point,line,boundary,centroid
output=name [required]
 
Name for output vector map
column=name
 
The name of the column whose values are to be used as new categories
 
The source for the new key column must be type integer or string
rules=name
 
Full path to the reclass rule file

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

No table is created for the reclassed map if the column option is used and the column type is integer (as the result could contain ambiguities). If the column option is used and the column type is string, a new table is created containing the newly generated cat numbers and a single column containing the unique string column values, sorted in alphabetical order.
For dissolving common boundaries, see v.dissolve.

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.

(North Carolina sample dataset)
 
 
v.reclass in=streams out=streams_by_type column=I_vs_P
v.db.select streams_by_type
cat|I_vs_P
1|intermittent
2|perennial

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

v.dissolve, v.extract
GRASS SQL interface

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: 2015-05-11 02:11:34 +0200 (Mon, 11 May 2015) $

Available at: v.reclass source code (history)
Main index | Vector index | Topics index | Keywords index | Graphical index | Full index
© 2003-2018 GRASS Development Team, GRASS GIS 7.4.3 Reference Manual
GRASS 7.4.3

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