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Jul 4, 2023
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makeMap = (year, { w = width / 4, h = width / 4, grouped = false } = {}) => {
const maxYear = year === 2016 ? 2021 : year + 4;
const yearFormat = d3.format("");
return Plot.plot({
width: w,
insetTop: 30,
height: h,
marks: [
// Boundaries
Plot.geo(boundariesProj, {
stroke: "#f3f3f3",
strokeWidth: 0.5,
strokeOpacity: 0.3,
fill: "#f3f3f3",
fillOpacity: 0.1
}),
// Wildfire shapes
Plot.geo(fires, {
filter: (d) =>
year === "all"
? true
: grouped
? d.id > year && d.id <= maxYear
: +d.id === year,
strokeWidth: 1,
stroke: (d) => +d.id,
fill: (d) => +d.id
}),
// label
Plot.text([year], {
frameAnchor: "top",
dy: 10,
fontSize: 14,
fontFamily: "sans-serif",
text: (d) =>
year === "all"
? "Wildfies, 1986 - 2021"
: grouped
? `${yearFormat(year)} - ${yearFormat(maxYear)}`
: yearFormat(year),
fill: "white"
}),
// outline
Plot.frame({ stroke: "#f3f3f3" })
],
x: { axis: null },
y: { axis: null },
color: {
scheme: "Reds"
},
style: {
backgroundColor: "black"
}
});
}
boundaries = FileAttachment("boundaries@2.json").json()
fires = FileAttachment("simple@3.json").json()
// gdalsrsinfo lpr_000b21a_e.prj
boundaryProj = `+proj=lcc +lat_0=63.390675 +lon_0=-91.8666666666667 +lat_1=49 +lat_2=77 +x_0=6200000 +y_0=3000000 +datum=NAD83 +units=m +no_defs`
// gdalsrsinfo nbac_2020_r9_20210810.prj
fireProj = `+proj=lcc +lat_0=49 +lon_0=-95 +lat_1=49 +lat_2=77 +x_0=0 +y_0=0 +datum=NAD83 +units=m +no_defs`
proj4 = require("proj4@2.8")
// A function to recursively project coordinates in a geoJSON object
function recurseProject(coordsArr) {
if (Array.isArray(coordsArr[0])) return coordsArr.map(recurseProject);
return proj4(boundaryProj, fireProj, coordsArr); // project the coordinates from one projection to the other
}
// Do the projection of all coordinates
boundariesProj = {
return {
type: "FeatureCollection",
features: boundaries.features.map((feature) => {
return {
...feature,
geometry: {
type: feature.geometry.type,
coordinates: recurseProject(feature.geometry.coordinates)
}
};
})
};
}
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