NAME
v.category - Attach, delete or report vector categories to map geometry.
SYNOPSIS
v.category
v.category help
v.category [-g] input=string [output=string] [type=string[,string,...]] [option=string] [cat=integer] [layer=integer[,integer,...]] [step=integer]
Flags:
- -g
- shell script style, currently only for report
Parameters:
- input=string
- Name of input vector
- output=string
- Name of output vector
- type=string[,string,...]
- Type
- Options: point,line,boundary,centroid,area
- Default: point,line,boundary,centroid,area
- option=string
- Action to be done:
add - add a new category
del - delete category
chlayer - change layer number (e.g. layer=3,1 changes layer 3 to layer 1)
sum - add the value specified by cat option to the current category value
report - print report (statistics), in shell style:
layer type count min max
print - print category values, more cats in the same layer are separated by '/'
- Options: add,del,chlayer,sum,report,print
- Default: add
- cat=integer
- Category value
- Default: 1
- layer=integer[,integer,...]
- Layer number
- Default: 1
- step=integer
- Category increment
- Default: 1
DESCRIPTION
v.category attaches, deletes or reports vector categories to map
geometry. These categories (IDs) are used to link a vector map to an
attribute table.
NOTES
Use v.to.db to upload the related categories a linked attribute
table.
EXAMPLES
1) Report vector categories
v.category in=testmap option=report
FIELD 1:
type count min max
point 0 0 0
line 1379 1 1379
boundary 0 0 0
centroid 0 0 0
area 0 0 0
all 1379 1 1379
2) Delete all vector categories in field 1
v.category in=testmap out=outmap
option=del
3) Add vector categories in field 1 with step=2
v.category in=outmap out=stepmap
option=add step=2
FIELD 1:
type count min max
point 0 0 0
line 1379 1 2757
boundary 0 0 0
centroid 0 0 0
area 0 0 0
all 1379 1 2757
4) Add categories/centroids to a vector map without categories
v.category in=wkt out=wktnew
option=add
Results can be tested using d.what.vect.
SEE ALSO
v.db.connect,
v.to.db
AUTHOR
Radim Blazek, ITC-Irst, Trento, Italy
Last changed: $Date: 2005/06/21 19:40:48 $
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