aRTlayer {aRT}R Documentation

Class aRTlayer

Description

Class that represents a layer of information in the database. It can insert geometries into the database, process them, and create/open aRTtable, aRTtheme, or aRTquerier objects. TerraLib layers can store different geometries within a single layer.

Objects from the Class

Objects can be created by calling createLayer() and openLayer(), methods of aRTdb.

Extends

Class aRTcomponent, directly.

Methods

addLines:
Inserts lines in the layer.
addPoints:
Inserts points in the layer.
addPolygons:
Inserts polygons (rings) in the layer.
addRaster:
Inserts a raster data in the layer.
addShape:
Inserts data from a shapefile in the layer.
createLayer:
Creates a layer with cellular data, based on the spatial data of the layer.
createTable:
Creates a table and returns it.
createTheme:
Creates a theme and returns it.
getBox:
Returns the bunding box of the layer.
getDistance:
Returns the distance betweeen layer objects.
getLines:
Returns the lines of the layer.
getMetric:
Returns a metric operations (buffer, length, area, convex hull).
getNN:
Returns the nearest neighbours of some geometries. (Not implemented yet)
getOperation:
Returns the centroid, convex hull, or buffer of a given object.
getPoints:
Returns the points of the layer.
getPolygons:
Returns the polygons of the layer.
getProj:
Returns information about the projection of the layer.
getRaster:
Returns the raster of the layer.
getRelation:
Looks for spatial relations as contains, crosses, touches.
getSetOperation:
Calculates a set operation (union, difference, intersection, xor).
importTable:
Imports a data.frame to a new table.
openTable:
Opens an existent table.
openTheme:
Opens an existent theme.
openQuerier:
Opens a query over the layer.
plot:
Plots the data.
showTables:
Shows all information tables in the layer.

Author(s)

Marcos Aurelio Carrero, Pedro Ribeiro de Andrade

See Also

See aRTlayer-METHOD for a method of this class or CLASSNAME-class for links to other classes. Package spproj for conversion of projections.


[Package aRT version 1.6-1 Index]