RArcInfo (version 0.3)

get.paldata: Function for importing the contents of a PAL file into R

Description

This function reads and imports into R the contents of a polygon definitions file.

Usage

get.paldata(datadir, coverage, filename="pal.adf")

Arguments

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 'pal.adf'

Value

• This function returns a list with two elements. The first one is a data frame with the next fields (columns):
• PolygonID
  A number that identifies this polygon.
• MinX
  Minimum value for all the X component of the coordinates.
• MinY
  Minimum value for all the Y component of the coordinates.
• MaxX
  Maximum value for all the X component of the coordinates.
• MaxY
  Maximum value for all the Y component of the coordinates.
• NArcs
• The second element in the list is also a list in which each element is composed by three arrays with information about the polygons that are in the polygon boundary: 'Arc ID', 'From Node' and 'Adjacent Polygon'.

References

More information about this kind of data can be found at http://pages.infinit.net/danmo/e00/docs/v7_bin_cover.html.