plotting points on a world map using ggmap?

[Sarah Supp]

I'm new to using ggplot2 and ggmap, but I have been impressed with how quickly and easily I can make good-looking maps across many different scales using ggmap! For my current project, I need to plot points that occur across the globe on a map with a black and white terrain background. I am having trouble getting any background map to show when I specify zoom = 1, or anything <3. In this case, I just get a scatterplot of the points on a blank background. Is this not a current functionality of ggmap? Some posts I found on Stack Overflow suggest it may not be possible to zoom out this far. If not, are there plans to develop the package to make it possible in the future?

Sarah

[David Kahle]

This works for me on a dev version of ggmap:

bbox <- c(left = -170, bottom = -60, right = 170, top = 80)

ggmap(get_stamenmap(bbox, zoom = 3, maptype="toner"), extent = "device")

Stamen doesn't make it's terrain for the entire world : http://tile.stamen.com/terrain/#4/19.00/-456.40

but it does most others, e.g. the toner : http://tile.stamen.com/toner/#2/19.0/-456.4

("toner-lite" in the dev version is probably better for you.)

For the dev version, do the following (and restart R afterwards)

install.packages("devtools")

library(devtools)

install_github("ggmap","dkahle")

Cheers

david.

On Oct 14, 2013, at 11:43 AM, Sarah Supp wrote:

I'm new to using ggplot2 and ggmap, but I have been impressed with how quickly and easily I can make good-looking maps across many different scales using ggmap! For my current project, I need to plot points that occur across the globe on a map with a black and white terrain background. I am having trouble getting any background map to show when I specify zoom = 1, or anything <3. In this case, I just get a scatterplot of the points on a blank background. Is this not a current functionality of ggmap? Some posts I found on Stack Overflow suggest it may not be possible to zoom out this far. If not, are there plans to develop the package to make it possible in the future?

Sarah

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David J. Kahle, Ph.D.

Assistant Professor of Statistical Science

Department of Statistical Science

Baylor University

One Bear Place #97140

Waco, Texas 76798

Office : (254) 710-6102

http://sites.google.com/site/davidkahle/