How to map categorical variables in gvisGeoMap/gvisGeoChart

[David Zornek]

I am attempting to create a map in which each US state is colored according to a character type categorical variable. I am able to get the map to render, but all of the tooltips show a numeric value instead of the character string in my variable. Here's a reproducible example:

library(googleVis)
library(datasets)


category <- c("A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E",
           "A","B","C","D","E")

hover <- c(1:50)

data <- data.frame(state.name,category,hover)

Map <- gvisGeoMap(data, "state.name", "category", "hover",
                    options=list(region="US", 
                                 displayMode="regions", 
                                 resolution="provinces",
                                 width=600, height=400))
plot(Map)

The map assigns colors correctly for "category," but the tooltip shows category as a number, rather than a letter A - E. Ultimately, I would like to be able to assign discrete colors to each category, rather than using a gradient, but I'll take one step at a time with my questions. The end goal is to use this map in a Shiny app. Any help is much appreciated.

P.S. I've tried gvisGeoChart with essentially the same result. Simply assigning hover = category doesn't work in my situation; in the final product, I will be displaying a separate hover variable in the tool tip.

[Sergey Grabkovsky]

Hi David,

I'm not really sure what gvisGeoMap does, since it's not officially supported by Google, but here's an example of how you can do it in JavaScript: http://jsfiddle.net/LLknt4cc/1/

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[David Zornek]

Thanks a bunch. I think I can make that work!

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