Using Interpolation On The Fly

INFO

Sine waves

using Tyler, GLMakie
using Interpolations: interpolate, Gridded, Linear

f(lon,lat)=cosd(16*lon)+sind(16*lat)

f_in_0_1_range(lon,lat)=0.5+0.25*f(lon,lat)

nodes=(-180.0:180.0, -90.0:90.0)

array=[f(lon,lat) for lon in nodes[1], lat in nodes[2]]
array=(array.-minimum(array))./(maximum(array)-minimum(array))

itp = interpolate(nodes, array, Gridded(Linear()))
cols=Makie.to_colormap(:viridis)

col(i)=RGBAf(Makie.interpolated_getindex(cols,i))
fun(x,y) = col(itp(x,y))

options = Dict(:min_zoom => 1,:max_zoom => 19)

p1 = Tyler.Interpolator(f_in_0_1_range; options)
p2 = Tyler.Interpolator(fun; options)

b = Rect2f(-20.0, -20.0, 40.0, 40.0)
m = Tyler.Map(b, provider=p1)
wait(m)

TIP

Try b = Rect2f(-180.0, -89.9, 360.0, 179.8)

INFO

interpolated_getindex requires input i to be in the 0-1 range.