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| # setup | |
| # import Pkg; | |
| # Pkg.pkg"add Makie#master PlotUtils GeoInterface GeoJSON" | |
| using Makie | |
| using GeoInterface, GeoJSON | |
| using PlotUtils | |
| using Proj4 | |
| states = download("https://raw.githubusercontent.com/PublicaMundi/MappingAPI/master/data/geojson/us-states.json") | |
| states_geo = GeoJSON.parse(read(states, String)) | |
| features = states_geo.features | |
| wgs84 = Projection("+proj=longlat +datum=WGS84 +no_defs") | |
| albers_us = Projection("+proj=aea +lat_1=29.5 +lat_2=45.5 +lon_0=-96.0 +datum=WGS84 +no_defs") | |
| function project(geometry::Polygon, from, to) | |
| newcoords = map(coordinates(geometry)) do ring | |
| map(ring) do point | |
| transform(from, to, point) | |
| end | |
| end | |
| Polygon(newcoords) | |
| end | |
| function project(geometry::MultiPolygon, from, to) | |
| newcoords = map(coordinates(geometry)) do element | |
| map(element) do ring | |
| map(ring) do point | |
| transform(from, to, point) | |
| end | |
| end | |
| end | |
| MultiPolygon(newcoords) | |
| end | |
| for feature in features | |
| feature.geometry = project(geometry(feature), wgs84, albers_us) | |
| end | |
| props = getproperty.(features, :properties) | |
| densities = getindex.(props, "density") | |
| cr = let ds = sort(densities); (ds[1], ds[end-1]); end | |
| Base.convert(poly::GeoInterface.Polygon, ::Type{Point2f0}) = Point2f0.(poly.coordinates[1]) | |
| viridis = cgrad(:viridis; scale = :log10) | |
| function plo(sc::Scene, poly::Polygon; kwargs...) | |
| poly!(sc, convert(poly, Point2f0); kwargs...) | |
| end | |
| function plo(sc, poly::MultiPolygon; kwargs...) | |
| data = map(x -> Point2f0.(x[1]), poly.coordinates) | |
| poly!(sc, data; kwargs...) | |
| sc | |
| end | |
| sc = Scene() | |
| normalize(val::Real; min = cr[1], max = cr[2]) = (val - min) / (max - min) | |
| for (i, feature) in enumerate(features) | |
| println(i) | |
| try | |
| plo(sc, feature.geometry, color = viridis[normalize(feature.properties["density"])]) | |
| catch err | |
| @warn("Feature had dimension zero!") | |
| print(err) | |
| pop!(sc.plots) | |
| end | |
| # display(sc) | |
| end | |
| save("usa-pop-density-log.png", sc) |
Author
benelsen
commented
Aug 3, 2019
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