R: How to : 3d Density plot with gplot and geom_density

Question

I'm trying to combine multiple density plots with overlay. ggplot and geom_density do the job, but the densities are stacked on top of each other.

ggplot(all.complete, aes(x=humid_temp)) +  
  geom_density(aes(group=height, colour=height, fill=height.f, alpha=0.1)) + 
  guides(fill = guide_legend(override.aes = list(colour = NULL))) +
  labs(main="Temperature by Height", x="Temperature", y="Density")

Something similar to this is what I'm trying to achieve:

In my case, the years would be substituted by height.

Thanks!!!

Answer 1

The chart you are looking for is called a ridgelineplot. Try the ggridges package with ggplot2.

An example with temporal data:

library(viridis)
ggplot(lincoln_weather, aes(x = `Mean Temperature [F]`, y = `Month`, fill = ..x..)) +
  geom_density_ridges_gradient(scale = 3, rel_min_height = 0.01, gradient_lwd = 1.) +
  scale_x_continuous(expand = c(0.01, 0)) +
  scale_y_discrete(expand = c(0.01, 0)) +
  scale_fill_viridis(name = "Temp. [F]", option = "C") +
  labs(title = 'Temperatures in Lincoln NE',
       subtitle = 'Mean temperatures (Fahrenheit) by month for 2016\nData: Original CSV from the Weather Underground') +
  theme_ridges(font_size = 13, grid = TRUE) + theme(axis.title.y = element_blank())

Here is the result :