I'm trying to replicate the map shown in Ari's ACS talk using tract_choropleth. However, the codes keep returning an Error message. I have requested the api key and other functions like state_choropleth() and county_choropleth() were working just fine.
library(choroplethr)
library(choroplethrMaps)
#api.key.install(DONE)
ny_tract = get_tract_demographics("new york", endyear = 2015)
ny_tract$value = ny_tract$per_capita_income
tract_choropleth(ny_tract, state_name="new york", title='2015 map of NY',
legend = "dollars", num_colors = 1, county_zoom = 36061)
The Error message is
Error in maptools::unionSpatialPolygons(cp, attr[,region]): isTRUE(gpclibPermitStatus()) is not TRUE
I can see that the data frame ny_tract was loaded with many NA introduced by coercion warnings.
Thank you for your help.
The error is due to gpclibPermitStatus() returning FALSE.
Unfortunately, this is a common error that comes up when working with choroplethr. I once gave a lengthy answer to the question here.
The short answer is to type the following:
install.packages("gpclib")
library(maptools)
gpclibPermit()