Created
November 12, 2023 20:30
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ggblend topography
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library(metR) | |
library(data.table) | |
library(ggplot2) | |
proj <- "+proj=lcc +lon_0=-60 +lat_1=-0 +lat_2=-40" | |
topo <- GetTopography(ConvertLongitude(-85), | |
330, lat.north = 14, lat.south = -58, | |
resolution = 2/60) |> | |
_[, c("dlon", "dlat") := Derivate(h ~ lon + lat)] |> | |
_[, c("dx", "dy") := list(dx(dlon, lat), | |
dy(dlat))] | |
r <- 1/1.3 | |
height <- 1600 | |
png(filename = "~/Downloads/with_blend.png", width = height*r, height = height) | |
with_blend <- topo |> | |
ggplot(aes(lon, lat)) + | |
list( | |
geom_raster(aes(fill = sqrt(dx^2 + dy^2)), alpha = 1), | |
scale_fill_gradient(low = "white", high = "black", guide = "none"), | |
ggnewscale::new_scale_fill(), | |
geom_raster(data = \(x) subset(x, h> 0), aes(fill = h),alpha = 1), | |
scale_fill_gradientn(colors = terrain.colors(5), guide = "none"), | |
ggnewscale::new_scale_fill(), | |
geom_raster(data = \(x) subset(x, h < 0), aes(fill = h), alpha = 1), | |
scale_fill_gradientn(colors = topo.colors(10)[1:4], guide = "none"), | |
ggnewscale::new_scale_fill() | |
) |> ggblend::blend("multiply") + | |
geom_contour2(aes(z = h), breaks = 0) + | |
coord_sf(crs = proj) + | |
theme_void() | |
print(last_plot()) | |
dev.off() | |
png(filename = "~/Downloads/no_blend.png", width = height*r, height = height) | |
no_blend <- topo |> | |
ggplot(aes(lon, lat)) + | |
list( | |
geom_raster(data = \(x) subset(x, h> 0), aes(fill = h),alpha = 1), | |
scale_fill_gradientn(colors = terrain.colors(5), guide = "none"), | |
ggnewscale::new_scale_fill(), | |
geom_raster(data = \(x) subset(x, h < 0), aes(fill = h), alpha = 1), | |
scale_fill_gradientn(colors = topo.colors(10)[1:4], guide = "none"), | |
ggnewscale::new_scale_fill() | |
) |> ggblend::blend("multiply") + | |
geom_contour2(aes(z = h), breaks = 0) + | |
coord_sf(crs = proj) + | |
theme_void() | |
print(last_plot()) | |
dev.off() |
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