Bubble Plot

As alternative visualisation to the level plot, the following figures are bubble plots of the same dataset. The figures seem to show better visualisation of the element concentration in the groundwater and river water.

1. load library and data

library("lattice")    # for plotting
library("dplyr")      # for data manipulation
library("gridExtra")  # for multiple plot
library("sp")         # for spatial analysis
data <- read.csv("BandungData.csv", header=TRUE)
coordinates(data) <- ~ x + y # assigning x and y columns as coordinates

2. Making bubble plot objects

We used the following code to build bubble plot object.

bubbleNO3 <- bubble(data, zcol="NO3", 
          xlab="X coord", ylab="Y coord",
          main="Bubble plot NO3",
          scales=list(tck=0.5))

3. Plotting

grid.arrange(bubbleNO3, bubbleNO2, 
             bubbleSO4, bubbleCl, 
             ncol=2)

grid.arrange(bubbleSiO2, bubbleFe, 
             bubbleMg, bubbleMn, 
             ncol=2)

4. Remarks

• NO3 plot
  • There’s no significant difference between concentration in the groundwater and in the river water.
• NO2 plot
  • There’s no significant difference between concentration in the groundwater and in the river water.
• SO4 plot
  • There’s no significant difference between concentration in the groundwater and in the river water.
• Cl plot
  • There’s no significant difference between concentration in the groundwater and in the river water.
• SiO2 plot
  • There’s no significant difference between concentration in the groundwater and in the river water.
• Fe and Mg plot
  • Both plots show similar characteristic. The concentration of both elements in the groundwater is higher than in the river water. However, we can see some hotspots in the river water, where we found groundwater springs discharge near by.
• Mn plot
  • The plot shows significant difference of Mn concentration in the groundwater compared to river water. River water has very low concentration of Mn.