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Gridded Population (15 minute) - United States
points = {
//Modified from https://observablehq.com/@toja/gridded-population-of-the-world
const features = [];
const { nrows, ncols, cellsize, xllcorner, yllcorner, NODATA_value } =
parsed.header;
for (let y = 0; y < nrows; y++) {
for (let x = 0; x < ncols; x++) {
/*
Raster starts in upper left hand corner and moves east then restarts one row down on the left. This is confusing because the reference coordinates are provided for the lower left hand of the raster.
*/
features.push({
type: "Feature",
geometry: {
type: "Point",
coordinates: [
x * cellsize - (-xllcorner - cellsize / 2),
-y * cellsize + (-yllcorner - cellsize / 2)
]
},
properties: {
count: parsed.data[y][x]
}
});
}
}
return {
type: "FeatureCollection",
features: features.filter(
(d) =>
(d.properties.count !== parsed.header.NODATA_value) &
(d.properties.count > 0)
)
};
}
import { parse } from "@toja/gridded-population-of-the-world"
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