Data obtained from GEBCO 2019, via whatarelief package from AAD COG (GeoTIFF).
Details
A matrix of global elevation values in a smallish matrix, extent is -180,180,-90,90,
crs is "OGC:CRS84".
Examples
ximage(topo, extent = c(-180, 180, -90, 90))
ximage(logo_n, extent = c(135, 155, -48, -30), add = TRUE)
