Rechercher une page de manuel

Chercher une autre page de manuel:

v.what.vect

Langue: en

Autres versions - même langue

Version: 369485 (fedora - 01/12/10)

Section: 1 (Commandes utilisateur)

NAME

v.what.vect - Uploads vector values at positions of vector points to the table.

KEYWORDS

vector, database, attribute table

SYNOPSIS

v.what.vect
v.what.vect help
v.what.vect vector=name [layer=integer] column=string qvector=name [qlayer=integer] qcolumn=string [--verbose] [--quiet]

Parameters:

vector=name

Points vector map to modify
layer=integer

Layer in the vector to be modified
Default: 1
column=string

Column to be updated with the query result
qvector=name

Vector map to be queried
qlayer=integer

Layer of the query vector containg data
Default: 1
qcolumn=string

Column to be queried

DESCRIPTION

v.what.vect transfers attributes from the qvector's map attribute table into the attribute table of points present in the vector map. The script is based on v.distance.

NOTES

The upload column, into which the query results are stored, must be present in the vector map. Use v.db.addcol to add one if needed.

This module only uploads attributes which exist at the exact positions of the input's vector points. For a "nearest feature" fit, use v.distance instead.

In case of a multipoint input vector map, with several points having the same category number, it can happen, that the query result is NULL, if the same category number falls into different qvector polygons.

EXAMPLE

In this example, the 'archsites' point map in the Spearfish location is copied to the current mapset, a new attribute column is added and the owner names from the 'fields' polygon map are transferred to the 'myarchsites' map at points' locations:
g.copy vect=archsites,myarchsites
v.db.addcol myarchsites col="owner varchar(25)"
v.what.vect myarchsites qvect=fields column=owner qcolumn=label
# verification:
v.db.select myarchsites

SEE ALSO

v.db.addcol, v.db.select, v.distance, v.rast.stats, v.what.rast

AUTHOR

Markus Neteler

Last changed: $Date: 2007-06-10 13:23:21 +0200 (Sun, 10 Jun 2007) $

Full index

© 2003-2008 GRASS Development Team

Dans un parallélépipède rectangle se déplaçant le long d'une ligne
droite d'équation 84x + S = y, un homoïde A présentant une calotte
sphérique entourée de deux sinusoïdes, au dessus d'une partie
cylindrique de longueur l > n, présente un point de contact avec un
homoïde trivial B. Démontrer que ce point de contact est un point de
rebroussement. Si l'homoïde A rencontre un homoïde homologue C, alors
le point de contact est un disque de rayon r > l. Déterminer la hauteur
h de ce point de contact par rapport à l'axe vertical de l'homoïde A...
-+- Raymond Queneau, Exercices de style -+-