You want to add a second point variable on animated maps in R! Here's a walkthrough:

Step 1: Prepare your data

- Make sure you have a dataframe with the following columns:

- id (unique identifier for each point)

- lon (longitude)

- lat (latitude)

- variable1 (first variable you want to animate)

- variable2 (second variable you want to animate)

- Ensure your data is in a suitable format for animation (e.g., regular time intervals)

Step 2: Choose an animation library

- Popular options include:

- gganimate (built on top of ggplot2)

- animation (a base R package)

- leaflet (for interactive web maps)

- Each library has its strengths and weaknesses, so choose the one that best fits your needs

Step 3: Create a base map

- Use your chosen library to create a base map with the first variable (variable1)

- This will serve as the foundation for your animated map

Step 4: Add the second point variable

- Use the same library to add the second variable (variable2) as a new layer or feature

- You may need to use a different geometry or symbol for the second variable to distinguish it from the first

Step 5: Animate the map

- Use the animation library to create a sequence of maps showing the changes in both variables over time

- You can control the animation speed, frames, and other settings to customize the visualization

Example with gganimate:

- First, install and load gganimate and ggplot2

- Create a sample dataframe: df <- data.frame(id = 1:10, lon = runif(10), lat = runif(10), variable1 = rnorm(10), variable2 = rnorm(10, mean = 2))

- Create a base map with variable1: p <- ggplot(df, aes(x = lon, y = lat, color = variable1)) + geom_point()

- Add variable2 as a new layer: p + geom_point(aes(x = lon, y = lat, color = variable2), shape = 22, fill = "white")

- Animate the map: animate(p, frames = 10, interval = 0.1, renderer = gifski_renderer())

This is a basic example, and you'll likely need to customize it to fit your specific data and requirements. Happy animating!