mmap: Regional mapping

In phytomosaic/vuln: Niche-based Vulnerability of Species and Communities

Description

Map geographic locations as points colored by values.

Usage

mmap(x, field, name = field, title = "", alpha = NA, sizept = 1,
  sizetxt = 1, xlim = c(-122, -75), ylim = c(25, 49.5), bg = NA,
  colorscale, midval = 0.6, ...)

Arguments

x	data.frame of observations.
field	character, name of column in x by which to color points.
name	character, name for color scale.
title	character, main title.
alpha	numeric vector, values used for relative alpha transparency.
sizept, sizetxt	numeric, relative size for points and text.
xlim	numeric vector, x limits (longitude in decimal degrees).
ylim	numeric vector, y limits (latitude in decimal degrees).
bg	character, background fill for land area (defaults to transparent).
colorscale	character, one of c('bw','bw2','inferno', 'discretebw') defining the color scale.
midval	numeric, value at color scale midpoint when colorscale = 'bw2'.
...	further arguments passed to ggplot2 color scales (for example, transformations).

Details

Plot continuous or discrete values mapped across regions of North America.

Value

Returns or plots an object inheriting from class 'ggplot'.

Examples

# iris data
set.seed(1959)
x <- iris[,1:3]
n <- NROW(x)
# add geographic structure
x <- data.frame(
     x,
     lon = seq(-80,-120,len=n) + rnorm(n,0,2),
     lat = seq(30,45,len=n) + rnorm(n,0,2),
     Sepal.Big = as.factor(ifelse(x$Sepal.Length > 6,1,0)))
(mmap(x, 'Sepal.Length', alpha=1, name='Sepal length'))
(mmap(x, 'Sepal.Length', alpha=1, name='Sepal length',
      colorscale='inferno'))
(mmap(x, 'Sepal.Big',  name='Sepal > 6 mm'))

phytomosaic/vuln documentation built on Sept. 21, 2019, 8:23 a.m.