Created
July 17, 2017 23:05
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# Establish the vector scalar for the wind | |
wind_uv_scalar <- 0.5 | |
# The bottom figure (air) | |
mg_bottom <- ggplot(data = southern_africa_coast, aes(x = lon, y = lat)) + | |
# The ocean temperature | |
geom_raster(data = air_temp, aes(fill = value)) + | |
# The land mass | |
geom_polygon(aes(group = group), fill = NA, colour = "black", size = 0.5, show.legend = FALSE) + | |
geom_path(data = africa_borders, aes(group = group)) + | |
# The current vectors | |
geom_segment(data = winds, aes(xend = lon + u * wind_uv_scalar, yend = lat + v * wind_uv_scalar), | |
arrow = arrow(angle = 15, length = unit(0.02, "inches"), type = "closed"), alpha = 0.4) + | |
# The legend for the vector length | |
geom_label(aes(x = 36, y = -37, label = "4.0 m/s\n"), size = 3, label.padding = unit(0.5, "lines")) + | |
geom_segment(aes(x = 35, y = -37.5, xend = 37, yend = -37.5)) + | |
# Improve on the x and y axis labels | |
scale_x_continuous(breaks = seq(15, 35, 5), | |
labels = scales::unit_format("°E", sep = "")) + | |
scale_y_continuous(breaks = seq(-35, -30, 5), | |
labels = c("35°S", "30°S")) + | |
labs(x = NULL, y = NULL) + | |
# Scale bar | |
scaleBar(lon = 13, lat = -38.0, distanceLon = 200, distanceLat = 50, distanceLegend = 90, dist.unit = "km", | |
arrow.length = 200, arrow.distance = 130, arrow.North.size = 4) + | |
# Slightly shrink the plotting area | |
coord_cartesian(xlim = c(10.5, 39.5), ylim = c(-39.5, -25.5), expand = F) + | |
# Use viridis colour scheme | |
scale_fill_viridis(name = "Temp.\n(°C)", option = "A") + | |
# Adjust the theme | |
theme_bw() + | |
theme(panel.border = element_rect(fill = NA, colour = "black", size = 1), | |
axis.text = element_text(colour = "black"), | |
axis.ticks = element_line(colour = "black")) |
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