plot_shape: Visualize fields
In rOpenGov/gisfin: Finland GIS R Tools

Description Usage Arguments Details Value Author(s) References Examples

Visualize the specified fields of a shape object on using 1- or 2-way color scale.

This function is used for fast investigation of shape objects; standard visualization choices are made automatically; fast and easy-to-use but does not necessarily provide optimal visualization.

plot_shape(sp, varname, type = "oneway", ncol = 10, at = NULL,
  palette = NULL, main = NULL, colorkey = TRUE, lwd = 0.4,
  border.col = "black", col.regions = NULL, min.color = "white",
  max.color = "red", plot = TRUE)

`sp`	Shape object
`varname`	Variable name from the shape object sp to be visualized
`type`	String. Specifies visualization type. Options: "oneway", "twoway", "qualitative", "custom". See details.
`ncol`	Number of distinct colors shades
`at`	Color transition points
`palette`	Optional. Color palette.
`main`	Optional. Title text.
`colorkey`	Logical. Show color interpretation in a separate legend.
`lwd`	Optional. Line width for shape polygon borders.
`border.col`	Optional. Color for shape polygon borders.
`col.regions`	Optional. Specify color for the shape object regions manually.
`min.color`	Color for minimum values in the color scale
`max.color`	Color for maximum values in the color scale
`plot`	Plot the image TRUE/FALSE

Visualization types include: oneway/sequential (color scale ranges from white to dark red, or custom color given with the palette argument); twoway/bipolar/diverging (color scale ranges from dark blue through white to dark red; or custom colors); discrete/qualitative (discrete color scale; the colors are used to visually separate regions); and "custom" (specify colors with the col.regions argument)

A Trellis Plot Object

Leo Lahti and Juuso Parkkinen louhos@googlegroups.com

See citation("gisfin")