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Partial Replication of Climate Radar Chart (http://www.climate-lab-book.ac.uk/2016/spiralling-global-temperatures/)
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| library(needs) | |
| # gganimate: devtools::install_github("dgrtwo/gganimate") | |
| needs(ggplot2, gganimate, dplyr, viridis) | |
| # HadCRUT4.4 | |
| file_url = "http://www.metoffice.gov.uk/hadobs/hadcrut4/data/current/time_series/HadCRUT.4.4.0.0.monthly_ns_avg.txt" | |
| if(!file.exists("data.txt")) download.file(file_url, "data.txt") | |
| read.table("data.txt", "", header = F, stringsAsFactors = F) %>% | |
| mutate(Date = as.Date(sprintf("%s/01", V1), "%Y/%m/%d")) %>% | |
| select(Date, Median = V2) -> | |
| data | |
| mean_1850_1900 <- mean(filter(data, Date <= "1900-01-01")$Median) | |
| p <- data %>% | |
| filter(Date < "2016-01-01") %>% | |
| mutate(temp = Median - mean_1850_1900, | |
| Month = format(Date, "%b"), | |
| Month = factor(Month, levels = month.abb), | |
| Year = format(Date, "%Y")) %>% | |
| ggplot(aes(x = Month, y = temp, colour = Year, group = Year, frame = Year)) + | |
| geom_polygon(fill = NA, size = 1, aes(cumulative = T)) + | |
| geom_text(aes(label = Year), x = -.5, y = -.7, colour = "white", size = 10) + | |
| scale_y_continuous(NULL, labels = NULL) + | |
| scale_x_discrete(NULL) + | |
| ggtitle("Global temperature changes (1850 - 2015)") + | |
| coord_polar(theta = "x") + | |
| scale_color_viridis(discrete = T) + | |
| theme(legend.position = "none", | |
| plot.background = element_rect(fill = "#333333"), | |
| panel.background = element_rect("transparent"), | |
| axis.text.x = element_text(size = 16, colour = "white"), | |
| panel.grid = element_line("transparent"), | |
| panel.grid.major = element_line("transparent"), | |
| axis.title.y = element_text(colour = "transparent"), | |
| axis.title.x = element_text(colour = "transparent"), | |
| plot.margin = unit(rep(.25, 4), "inches"), | |
| title = element_text(colour = "white", size = 18)) | |
| gg_animate(p, "chart.gif", interval = 0.2, title_frame = F) |
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