Created
March 12, 2019 14:15
Star
You must be signed in to star a gist
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(raster) | |
library(sf) | |
library(viridis) | |
library(cartography) | |
library(tanaka) | |
temp <- tempfile() | |
data_url <- "http://cidportal.jrc.ec.europa.eu/ftp/jrc-opendata/GHSL/GHS_POP_GPW4_GLOBE_R2015A/GHS_POP_GPW42015_GLOBE_R2015A_54009_1k/V1-0/GHS_POP_GPW42015_GLOBE_R2015A_54009_1k_v1_0.zip" | |
download.file(data_url, temp) | |
unzip(temp, exdir = "pop") | |
pop2015 <- raster("pop/GHS_POP_GPW42015_GLOBE_R2015A_54009_1k_v1_0/GHS_POP_GPW42015_GLOBE_R2015A_54009_1k_v1_0.tif") | |
center <- st_as_sf(data.frame(x=425483.8, y=5608290), | |
coords=(c("x","y")), crs = st_crs(pop2015)) | |
center <- st_buffer(center, dist = 800000) | |
ras <- crop(pop2015, st_bbox(center)[c(1,3,2,4)]) | |
mat <- focalWeight(x = ras, d = c(10000), type = "Gauss") | |
rassmooth <- focal(x = ras, w = mat, fun = sum, pad = TRUE, padValue = 30) | |
bks <- c(0,25,50,100,250,500,750,1000,1750,2500,5000, 7500,10000) | |
png(filename = "circle.png", width = 800, height = 700, res = 100) | |
par(mar = c(0,0,1.2,0)) | |
tanaka(x = rassmooth, | |
breaks = bks, | |
mask = center, | |
col = inferno(12),shift = 2500, | |
legend.pos = "topleft", | |
legend.title = "Inhabitants\nper km2") | |
plot(st_geometry(center), add = T, border = "white", lwd = 6) | |
layoutLayer(title = "Smoothed Population Density", | |
author = 'Data : European Commission, Joint Research Centre (JRC); Columbia University, CIESIN (2015): GHS population grid, derived from GPW4.', | |
sources = 'T. Giraud, 2019', scale = F, frame = F, tabtitle = TRUE) | |
text(-374516.2 ,6408290.0, "Gaussian smoothing, sigma = 10km", adj = 0, font = 3, cex = .8 ) | |
dev.off() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment