Overview

This US Drought map shows available values by County - Jan to July 2021, data is from TidyTuesday 2021 week 30.

library(tidyverse)

tuesdata <- tidytuesdayR::tt_load(2021, week = 30)

drought <- tuesdata$drought


intensity_impacts<- c("D0"="Abnormally Dry",
                      "D1"="Moderate Drought",
                      "D2"="Severe Drought",
                      "D3"= "Extreme Drought",
                      "D4"="Exceptional Drought")

drought_short <- drought %>%
  dplyr::select(-map_date,-stat_fmt) %>%
  filter(!drought_lvl=="None",!area_pct==0)

library(sf)
library(raster)
library(spData)
library(spDataLarge)

library(maps)
library(viridis)
library(ggthemes)

library(zipcodeR)
zipcodeR::download_zip_data()

geo_codes<- zipcodeR::search_state(drought_short$state_abb)%>%
  dplyr::select(major_city,county,state,lat,lng,
                population,population_density,
                land_area_in_sqmi,water_area_in_sqmi,
                housing_units,occupied_housing_units,
                median_home_value,median_household_income) %>%
  drop_na()


my_geo_codes_df<-geo_codes%>%
  dplyr::select(state,lat,lng)

drought_short_map <- drought_short %>%
  arrange(valid_start)%>%
  mutate(year=lubridate::year(valid_start),
         month=lubridate::month(valid_start))%>%
  filter(str_detect(valid_start,"2021")) %>%
  #filter(month==c(1,2,3)) %>%
  group_by(month,state_abb,drought_lvl) %>%
  summarize(med_area_pct=round(median(area_pct),2))%>%
  ungroup() %>%
  filter(!med_area_pct==0) %>%
  left_join(my_geo_codes_df,by=c("state_abb"="state")) %>%
  mutate(month = month.name[month])


my_df <- drought_short_map%>%count(month,sort=T)%>%
  dplyr::select(-n)%>%
  mutate(month_id=row_number())%>%
  inner_join(drought_short_map,by="month")

library(extrafont)
#loadfonts()
#fonts()

droughts_family <- "Roboto Condensed"

library(gganimate)
library(cartography)

red.pal<-c("red", "orangered", "firebrick1", "brown3", "firebrick")

us_county_map <- map_data("county")
us_state_map <- map_data("state")

ggplot() +
  geom_point(data=subset(my_df,lat>25&lat<50),
             aes(x=lng,y=lat,color=factor(drought_lvl)),
             alpha=0.5,size=.4) +
  
  geom_polygon(data=us_county_map,aes(x=long,y=lat,group = group),
               fill=NA,color = "darkred",size=0.2) +
  
  geom_polygon(data=us_state_map,aes(x=long,y=lat,group = group),
               fill=NA,color = "red",size=0.4) +
  
  scale_color_manual(labels = intensity_impacts,
                     values=red.pal) +
  ggthemes::theme_map() +
  theme(legend.position = "none",
        legend.title = element_text(family = droughts_family),
        legend.text = element_text(size=8,family =droughts_family),
        legend.background = element_blank(),
        legend.box.background = element_blank(),
        legend.key = element_blank(),
        strip.background = element_blank(),
        strip.text = element_text(family = droughts_family),
        plot.title =element_text(size=25,face="bold",family =droughts_family,color="black"),
        plot.subtitle =element_text(size=12,face="bold",family =droughts_family),
        plot.caption =element_text(size=9,family =droughts_family,hjust = 0),
        plot.caption.position = "panel",
        plot.title.position = "panel") +

# gganimate specific bits:
       labs(title="US Drought variation - Month: {closest_state}",
       subtitle="",
       caption="US Drought map: available values by County - Jan to July 2021\n
       #30DayMapChallenge day6-red - graphic: Federica Gazzelloni")+
        transition_states(month) +
        ease_aes('linear')

# Save at gif:
anim_save("drought_red.gif")