center = projection([positionX, positionY])
isInsideCircle = (cell) => {
//compute distance from circle center to cell center
const d = Math.hypot(
positionX - cell.posGeo.x - resolution / 2,
positionY - cell.posGeo.y - resolution / 2
);
return d <= radiusKM * 1000;
}
popCircle = popShare(isInsideCircle, positionX, positionY, radiusKM)
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
