micromap (version 1.9.1)

create_map_table: Prepares A Polygon Table

Description

Takes the user supplied polygon table and prepares it to be plotted correctly with the lmplot function.

Usage

create_map_table(tmp.map, IDcolumn=NA, poly.thresh=.0001)

Arguments

tmp.map

a shapefile to be parsed into a flat table for use with ggplot2.

IDcolumn

specify which column in the data file to use as a unique identifier.

poly.thresh

specify the minimum polygon area which to keep. All polygons with less area will be dropped.

Value

• A flat table of all the polygons in the shapefile with an entry for each vertice.

Examples

data("USstates")
head(USstates@data)
statePolys <- create_map_table(USstates, IDcolumn="ST")
head(statePolys)