Maps — and other representations of the world.
Public
Edited
Mar 7, 2023
1 fork
17 stars
phas = () =>
Plot.plot({
width: 928,
projection: { type: "equal-earth", rotate: [-10, 0] },
color: { scheme: "rainbow" },
marks: [
Plot.raster(PHAS, {
pixelSize: 0.5,
x: LON,
y: LAT,
fill: PHAS
}),
Plot.contour(PHAS, {
pixelSize: 0.5,
x: LON,
y: LAT,
value: PHAS.map((d) => Math.sin((d / 180) * Math.PI * 12)),
thresholds: [0],
stroke: "white",
strokeWidth: 0.25
}),
Plot.contour(PHAS, {
pixelSize: 0.5,
x: LON,
y: LAT,
value: PHAS.map((d) => Math.sin((d / 180) * Math.PI * 2)),
thresholds: [0],
stroke: "white",
strokeWidth: 0.75
}),
Plot.sphere()
]
})
ampl = () =>
Plot.plot({
width: 928,
projection: { type: "equal-earth", rotate: [-10, 0] },
color: { scheme: "magma", reverse: true, type: "sqrt" },
marks: [
Plot.raster(AMPL, {
pixelSize: 0.5,
x: LON,
y: LAT,
fill: AMPL
}),
Plot.sphere()
]
})
// Supports NetCDF <= v3
netcdf = import("https://cdn.skypack.dev/netcdfjs@2.0.2?min").then(
(d) => d.NetCDFReader
)
reader = new netcdf(
await FileAttachment("m2.hamtide11a.nc.zip").zip()
.then((d) => d.file("m2.hamtide11a.nc").arrayBuffer())
)
X0 = Float32Array.from(reader.getDataVariable("PHAS"))
length = X0.length
filter = (data) => data.filter((_, i) => X0[i] >= 0)
PHAS = filter(X0)
AMPL = filter(Float32Array.from(reader.getDataVariable("AMPL")))
LON = {
const lon = new Float32Array(reader.getDataVariable("LON"));
return filter(Float32Array.from({length}, (_, i) => lon[i % lon.length]));
}
LAT = {
const lon = new Float32Array(reader.getDataVariable("LON"));
const lat = new Float32Array(reader.getDataVariable("LAT"));
return filter(
Float32Array.from({ length }, (_, i) => lat[Math.floor(i / lon.length)])
);
}
// RE = new Float32Array(reader.getDataVariable("RE"))
// IM = new Float32Array(reader.getDataVariable("IM"))
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