Shapefiles of Iowa's counties — ia

provenance - Chris, I need some help with how we document these exports.

ia_counties

Format

A data frame with 99 rows and 9 variables:

co_number: county number
co_fips: three-digit county fips code
acres_sf: square footage in acres
acres: county acreage, same as `ACRES_SF``
fips: five-digit fips code
county: county name (and it's `Obrien`)
state: two letter state abbreviation (`IA` all the way through)
id: identifier same as `CO_FIPS`
census2010pop: US Census Bureau count of 2010 county population.
popestimate2019: US Census Bureau estimate of 2019 county population.
geometry: simple feature object of polygons

Source

some url?

Examples

# county map of iowa in ggplot2
library(ggplot2)
library(dplyr) # for the pipe

ia_counties %>%
  ggplot() +
  geom_sf(aes(fill = popestimate2019),
          colour = "grey80", size = 0.1) +
  ggthemes::theme_map() +
  theme(legend.position="right") +
  scale_fill_gradient("2019 Population\nEstimate", trans="log",
    low = "grey80", high="darkred")

# leaflet map
library(leaflet)
library(sf)

ia_counties %>%
  group_by(county) %>%
  mutate(
    hovertext = htmltools::HTML(paste0(county, "<br>",popestimate2019))
  ) %>%
  leaflet() %>%
    addTiles() %>%
    addPolygons(label=~hovertext)