Last active
July 29, 2016 17:18
Star
You must be signed in to star a gist
Context: https://rud.is/b/2016/07/27/u-s-drought-animations-with-the-witchs-brew-purrr-broom-magick/
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
library(rgdal) | |
library(sp) | |
library(albersusa) # devtools::install_github("hrbrmstr/albersusa") | |
library(spdplyr) # devtools::install_github("mdsumner/spdplyr") | |
library(ggplot2) # devtools::install_github("hadley/ggplot2") | |
library(ggthemes) | |
library(rgeos) | |
library(purrr) | |
library(broom) | |
library(magick) | |
drought_map <- function(wk, pb=NULL) { | |
if (!is.null(pb)) pb$tick()$print() | |
hush_tidy <- quietly(tidy) | |
old_warn <- getOption("warn") | |
options(warn=-1) | |
week <- format(wk, "%Y%m%d") | |
tdir <- tempdir() | |
URL <- sprintf("http://droughtmonitor.unl.edu/data/shapefiles_m/USDM_%s_M.zip", week) | |
fil <- file.path(tdir, basename(URL)) | |
if (!file.exists(fil)) download.file(URL, fil, quiet=TRUE) | |
unzip(fil, exdir=tdir) | |
dr <- readOGR(file.path(tdir, sprintf("USDM_%s.shp", week)), | |
sprintf("USDM_%s", week), | |
verbose=FALSE, | |
stringsAsFactors=FALSE) | |
dr <- SpatialPolygonsDataFrame(gSimplify(dr, 0.01, TRUE), dr@data) | |
map(dr$DM, ~filter(dr, DM==.)) %>% | |
map(hush_tidy) %>% | |
map_df("result", .id="DM") -> m | |
usa_composite() %>% | |
filter(!(iso_3166_2 %in% c("AK", "HI"))) %>% | |
hush_tidy() -> usa | |
usa <- usa$result | |
ggplot() + | |
geom_map(data=m, map=m, | |
aes(long, lat, fill=DM, map_id=id), | |
color="#2b2b2b", size=0.05) + | |
geom_map(data=usa, map=usa, aes(long, lat, map_id=id), | |
color="#2b2b2b88", fill=NA, size=0.1) + | |
scale_fill_brewer("Drought Level", palette="YlOrBr") + | |
coord_map("polyconic", xlim=c(-130, -65), ylim=c(25, 50)) + | |
labs(x=sprintf("Week: %s", wk)) + | |
theme_map() + | |
theme(axis.title=element_text()) + | |
theme(axis.title.x=element_text()) + | |
theme(axis.title.y=element_blank()) + | |
theme(legend.position="bottom") + | |
theme(legend.direction="horizontal") -> gg | |
options(warn=old_warn) # put things back the way they were | |
outfil <- file.path(tdir, sprintf("gg-dm-%s.png", wk)) | |
ggsave(outfil, gg, width=8, height=5) | |
outfil | |
} | |
drought_weeks <- seq(as.Date("2016-01-05"), Sys.Date(), by="1 week") | |
pb <- progress_estimated(length(drought_weeks)) | |
drought_weeks %>% | |
map(drought_map, pb) %>% | |
map(image_read) %>% | |
image_join() %>% | |
image_animate(fps=2, loop=1) %>% | |
image_write("drought.gif") |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment