Hands-On Geospatial Analysis with R and QGIS

Plotting quantitative and qualitative data on a map

We can plot quantitative values using the choropleth() of the GISTools package. We can generate a choropleth using the following commands:

# plot quantitative datalibrary(GISTools)choropleth(map_bd, as.numeric(map_bd$value2))

We can also write a title and design this map further, but we will do these things in upcoming chapters. This gives us a nice little map:

Using spplot(), we can also plot qualitative data. First, we need to convert this qualitative attribute or column of SpatialPolygonsDataFrame to a factor variable and use a suitable color range. We have a shapefile of Dhaka's divisions, ...