Add arrows example

docs/make.jl

@@ -27,9 +27,11 @@ examples = [
     "geostationary_image.jl",
     "multiple_crs.jl",
     "is_it_a_plane.jl",
-    joinpath("gmt", "antioquia.jl"),
     joinpath("cartopy", "annotation.jl"),
     joinpath("cartopy", "katrina.jl"),
+    joinpath("cartopy", "arrows.jl"),
+    joinpath("cartopy", "vesta.jl"),
+    joinpath("gmt", "antioquia.jl"),
     "german_lakes.jl",
     "field_and_countries.jl",
     "meshimage.jl",

examples/cartopy/arrows.jl

@@ -0,0 +1,36 @@
+# # Gridded arrows
+# This example was taken from the [Cartopy gridded arrow example].  
+
+# The big idea is to plot arrows from one CRS in another!
+
+xs = LinRange(311.9, 391.1, 30)
+ys = LinRange(-23.6, 24.8, 20)
+
+us = @. 1 * (2 * cos(2 * deg2rad(xs) + 3 * deg2rad(ys' + 30)) ^ 2)
+vs = @. 2 * cos(6 * deg2rad(xs)) .+ ys' * 0 # that last part is just to establish the shape
+
+pole_longitude=177.5
+pole_latitude=37.5
+arrow_crs = "+proj=ob_tran +o_proj=latlon +o_lon_p=0 +o_lat_p=$(pole_latitude) +lon_0=$(180+pole_longitude) +to_meter=$(deg2rad(1) * 6378137.0)"
+
+f, a, p = arrows(
+    xs, ys, us, vs; 
+    arrowsize = 4,
+    source = arrow_crs, 
+    axis = (; type = GeoAxis, dest = "+proj=ortho +lon_0=-10 +lat_0=45")
+)
+# Now we plot the background:
+ep = surface!(a, 
+    -180..180, -90..90, 
+    zeros(axes(rotr90(GeoMakie.earth()))); 
+    shading = NoShading, color = rotr90(GeoMakie.earth())
+)
+translate!(ep, 0, 0, -1)
+f
+
+```@cardmeta
+Title = "Arrows"
+Description = "Gridded arrows"
+Cover = f
+```
+

examples/cartopy/vesta3d.jl

@@ -0,0 +1,3 @@
+using CairoMakie, GeoMakie
+
+const Da