Replace layering with overlaying

episodes/14-plot-raster-data.Rmd

@@ -182,7 +182,7 @@ ggplot() +
 
 ## Layering Rasters
 
-We can layer a raster on top of a hillshade raster for the same area, and use a transparency factor to create a 3-dimensional shaded effect. A hillshade is a raster that maps the terrain using light and shadow to create a 3D-looking image that you would see from above when viewing the terrain. We will add a custom color, making the plot grey.
+We can overlay a raster on top of a hillshade raster for the same area, and use a transparency factor to create a 3-dimensional shaded effect. A hillshade is a raster that maps the terrain using light and shadow to create a 3D-looking image that you would see from above when viewing the terrain. We will add a custom color, making the plot grey.
 
 First we need to read in our DSM hillshade data and view the structure:
 ```{r}