Realtime Rain Radar (Japan)Flood depth map on 3D terrainTest: Mapbox GL JS v2Drawing isobar on mapAsteroid Itokawa 3D [9MB]Pseudo-contouringDecoding PNG elevation tileJapan FloodBilinear interpolation of tileGradient of MountainOverlay DIY contour on mapDem to contour by d3H3 index visualizerFetch elevation tileMapbox GL + GeoJSON PolygonH3 GeoJsonMountain Terrain 3D
Contoured mountainious terrain 3D
Also listed in…
3D
// Fetch dem data as 256 x 256 array
// Mt. Nabewari, Japan
dem = fetchTile({z: 13, x: 7262, y: 3232})
// TODO: 0.2: handcrafted
heightScale = d => 0.2 * (d-elevRange[0])/(elevRange[1]-elevRange[0]);
// Scale xy cooridinates to [0, 1]
xyContour = scaleContour(contours, 1/256)
// 3D lineString meshes of contours
contourLineStrings = {
const lines = [];
xyContour.forEach(polygon => {
// Set color based on elevation
const lineColor = color(polygon.value);
// 2D to 3D: be carefull about right-handed / lef-handed system
polygon.coordinates.forEach(rings => {
rings.forEach(points => {
const points3 = points.map(([x, y]) => [y-0.5, x-0.5, heightScale(polygon.value)]);
lines.push(lineString(points3, lineColor));
});
});
});
return lines;
}
// Create lineString mesh with given coordinates and color
function lineString(points, color) {
const material = new THREE.LineBasicMaterial({color: color, blending: THREE.AdditiveBlending});
const geometry = new THREE.Geometry();
points.forEach(p => {
geometry.vertices.push(new THREE.Vector3(...p));
});
return new THREE.Line(geometry, material);
}
scene = {
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x333333);
contourLineStrings.forEach(l => scene.add(l));
return scene;
}
camera = {
const fov = 45;
const aspect = width / height;
const near = 0.01;
const far = 1000;
const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
camera.position.set(0.5, 0.5, 0.5);
camera.up.set(0, 0, 1);
camera.lookAt(new THREE.Vector3(0, 0, 0));
return camera;
}
height = 500
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.