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Re-centered version of: http://rud.is/b/2015/10/04/replicating-natgeos-proper-earthquake-map-in-r/
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library(rgeos) | |
library(maptools) | |
library(rgdal) | |
library(ggplot2) | |
library(ggthemes) | |
library(ggalt) # devtools::install_github("hrbrmstr/ggalt") | |
world <- readOGR("countries.geo.json", "OGRGeoJSON", stringsAsFactors=FALSE) | |
world <- gBuffer(world, byid=TRUE, width=0) | |
world <- nowrapRecenter(world) | |
plates <- readOGR("plates.json", "OGRGeoJSON", stringsAsFactors=FALSE) | |
plates <- nowrapRecenter(plates) | |
recenter_points <- function (obj) { | |
crds <- coordinates(obj) | |
inout <- (crds[, 1] < 0) | |
if (all(inout)) { crds[, 1] <- crds[, 1] + 360 } | |
else { if (any(inout)) { crds[, 1] <- ifelse(inout, crds[, 1] + 360, crds[, 1]) } } | |
SpatialPointsDataFrame(crds, obj@data) | |
} | |
quakes <- readOGR("quakes.json", "OGRGeoJSON", stringsAsFactors=FALSE) | |
quakes <- recenter_points(quakes) | |
world_map <- fortify(world) | |
plates_map <- fortify(plates) | |
quakes_dat <- data.frame(quakes) | |
quakes_dat$trans <- quakes_dat$mag %% 5 | |
gg <- ggplot() | |
gg <- gg + geom_cartogram(data=world_map, map=world_map, | |
aes(x=long, y=lat, map_id=id), | |
color="white", size=0.15, fill="#d8d8d6") | |
gg <- gg + geom_cartogram(data=plates_map, map=plates_map, | |
aes(x=long, y=lat, map_id=id), | |
color="black", size=0.1, fill="#00000000", alpha=0) | |
gg <- gg + geom_point(data=quakes_dat, | |
aes(x=coords.x1, y=coords.x2, size=trans), | |
shape=1, alpha=1/3, color="#d47e5d", fill="#00000000") | |
gg <- gg + geom_point(data=subset(quakes_dat, mag>7.5), | |
aes(x=coords.x1, y=coords.x2, size=trans), | |
shape=1, alpha=1, color="black", fill="#00000000") | |
gg <- gg + geom_text(data=subset(quakes_dat, mag>7.5), | |
aes(x=coords.x1, y=coords.x2, label=sprintf("Mag %2.1f", mag)), | |
color="black", size=3, vjust=c(3.9, 3.9, 5), fontface="bold") | |
gg <- gg + scale_size(name="Magnitude", trans="exp", labels=c(5:8), range=c(1, 20)) | |
gg <- gg + coord_quickmap() | |
gg <- gg + theme_map() | |
gg <- gg + theme(legend.position=c(0.05, 0.99)) | |
gg <- gg + theme(legend.direction="horizontal") | |
gg <- gg + theme(legend.key=element_rect(color="#00000000")) | |
gg |
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