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hexbin faceted choropleths in R
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| library(rgdal) | |
| library(rgeos) | |
| library(ggplot2) | |
| library(readr) | |
| library(tidyr) | |
| library(dplyr) | |
| library(grid) | |
| us <- readOGR("us_states_hexgrid.geojson", "OGRGeoJSON") | |
| centers <- cbind.data.frame(data.frame(gCentroid(us, byid=TRUE), id=us@data$iso3166_2)) | |
| us_map <- fortify(us, region="iso3166_2") | |
| intensity <- c(D0="Abnormally Dry", D1="Moderate Drought", D2="Severe Drought", | |
| D3="Extreme Drought", D4="Exceptional Drought") | |
| today <- format(Sys.Date(), "%Y%m%d") | |
| read_csv(sprintf("http://droughtmonitor.unl.edu/USDMStatistics.ashx/?mode=table&aoi=state&date=%s", today)) %>% | |
| gather(drought_level, value, D0, D1, D2, D3, D4) %>% | |
| mutate(intensity=factor(intensity[drought_level], | |
| levels=as.character(intensity), ordered=TRUE)) -> drought | |
| gg <- ggplot() | |
| gg <- gg + geom_map(data=us_map, map=us_map, | |
| aes(x=long, y=lat, map_id=id), | |
| color="white", size=0.5) | |
| gg <- gg + geom_map(data=drought, map=us_map, | |
| aes(fill=value, map_id=State)) | |
| gg <- gg + geom_map(data=drought, map=us_map, | |
| aes(map_id=State), | |
| fill="#ffffff", alpha=0, color="white", | |
| show_guide=FALSE) | |
| gg <- gg + geom_text(data=centers, aes(label=id, x=x, y=y), color="white", size=4) | |
| gg <- gg + scale_fill_distiller(name="State\nDrought\nCoverage", palette="RdPu", na.value="#7f7f7f", | |
| labels=sprintf("%d%%", c(0, 25, 50, 75, 100))) | |
| gg <- gg + coord_map() | |
| gg <- gg + facet_wrap(~intensity, ncol=2) | |
| gg <- gg + labs(x=NULL, y=NULL, title=sprintf("U.S. Drought Conditions as of %s\n", Sys.Date())) | |
| gg <- gg + theme_bw() | |
| gg <- gg + theme(plot.title=element_text(face="bold", hjust=0, size=24)) | |
| gg <- gg + theme(panel.border=element_blank()) | |
| gg <- gg + theme(panel.margin=unit(3, "lines")) | |
| gg <- gg + theme(panel.grid=element_blank()) | |
| gg <- gg + theme(axis.ticks=element_blank()) | |
| gg <- gg + theme(axis.text=element_blank()) | |
| gg <- gg + theme(strip.background=element_blank()) | |
| gg <- gg + theme(strip.text=element_text(face="bold", hjust=0, size=14)) | |
| gg <- gg + theme(legend.position=c(0.75, 0.15)) | |
| gg <- gg + theme(legend.direction="horizontal") | |
| gg <- gg + theme(legend.title.align=1) | |
| png(sprintf("%s.png", today), width=800, height=800) | |
| print(gg) | |
| dev.off() |
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gdallibrary and the a fresh install ofrgdal