9.3 Map Objects

# tm_polygons() == tm_fill() + tm_borders()
map_nz = tm_shape(nz) + tm_polygons()
class(map_nz)

## [1] "tmap"

9.3.1 Layers

map_nz1 = map_nz +
  tm_shape(nz_elev) + tm_raster(alpha = 0.7)
map_nz1

## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)

9.3.2 Pipeline

nz_water = st_union(nz) |> st_buffer(22200) |> 
  st_cast(to = "LINESTRING")
map_nz2 = map_nz1 +
  tm_shape(nz_water) + tm_lines()
map_nz2

## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)

9.3.3 Arrange

map_nz3 = map_nz2 +
  tm_shape(nz_height) + tm_dots()

tmap_arrange(map_nz1, map_nz2, map_nz3)

## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)
## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)
## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)
## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)

## Some legend labels were too wide. These labels have been resized to 0.62, 0.54, 0.54, 0.54, 0.54, 0.54. Increase legend.width (argument of tm_layout) to make the legend wider and therefore the labels larger.

## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)

## Some legend labels were too wide. These labels have been resized to 0.62, 0.54, 0.54, 0.54, 0.54, 0.54. Increase legend.width (argument of tm_layout) to make the legend wider and therefore the labels larger.

## stars object downsampled to 877 by 1140 cells. See tm_shape manual (argument raster.downsample)

## Some legend labels were too wide. These labels have been resized to 0.62, 0.54, 0.54, 0.54, 0.54, 0.54. Increase legend.width (argument of tm_layout) to make the legend wider and therefore the labels larger.