get.arcdata: Function for importing the contents of an ARC file into R
In RArcInfo: Functions to import data from Arc/Info V7.x binary coverages

This function reads and imports into R the contents of an arcs definition file.

1	get.arcdata(datadir, coverage, filename="arc.adf")

`datadir`	Directory under which all the coverages and a directory called 'info' are.
`coverage`	The name of the coverage we want to work with.
`filename`	The name of the file in the coverage directory that stores the data. By default, it is called 'arc.dat'.

This function returns a list with two elements. The first one is a data frame containing the next fields (by columns):

`ArcID`	A number that identifies this arc.
`ArcUserID`	Identifier defined by the user.
`FromNode`	The node where the arc begins.
`ToNode`	The node where the arc finishes.
`LeftPoly`	The number of the polygon that is to the left of the arc.
`RightPoly`	The number of the polygon that is to the right of the arc.
`NVertices`	The number of vertices the arc has.

The second element is a list that stores the vertices of the arc. So, each element in this list is also a list of two arrays: the first for the X coordinates and the secod for the Y coordinates.

RArcInfo documentation built on May 1, 2019, 10:26 p.m.