如何调整/更改空间绘图栅格中的 y 轴比例以移除白色区域

Question

I have this raster (image below) that I would like to resize as there is excess area below and above the continents (on the y-axis).

global land cover raster

Answer 1

If you are trying to trim white space and fix coordinates, the following expand argument may help:

ggplot() +
  geom_map(
    data = map_data("world"), map = map_data("world"),
    aes(x = long, y = lat, map_id = region)
  ) + 
  coord_fixed(ratio = 1) +
  scale_y_continuous(expand = c(0,0))