H3 Tutorial: Intro to h3-js (v4)Indexing Polygons With H3Cell counts per countryH3 Adaptive GridH3 Index Bit LayoutH3 Hierarchical (Non)ContainmentH3 Deck.gl Heat MapH3 Mapbox Style Heat MapIndexing OrderArea VariationH3 Continuous ElevationH3 Indexes: Cartesian vs SphericalH3 Index Inspector"Flat" H3 Grid via Gnomonic ProjectionH3 Radius LookupH3 Tutorial: Suitability AnalysisH3 Tutorial: Using Point LayersH3 Tutorial: Rendering HexagonsH3 Tutorial: Intro to h3-js (v3)H3 PathfindingSurface construction with H3
Shape simplification with H3
hexagons = {
let cells = new Set(japanHexagons);
function includedNeighbors(origin) {
const neighbors = h3.kRing(origin, kRingSize)
return neighbors.reduce(
(count, n) => count += cells.has(n) ? 1 : 0, 0
);
}
function dilate() {
for (const cell of cells) {
const neighbors = h3.kRing(cell, 1);
for (const neighbor of neighbors.filter(n => !cells.has(n))) {
if (includedNeighbors(neighbor) >= dThreshold) {
cells.add(neighbor);
}
}
}
}
function erode() {
for (const cell of cells) {
if (includedNeighbors(cell) <= eThreshold) {
cells.delete(cell);
}
}
}
for (let i = 0; i < passes; i++) {
if (firstOp === 'dilate, then erode') {
dilate();
erode();
} else {
erode();
dilate();
}
}
return Array.from(cells);
}
japanHexagons = {
let cells = [];
function addPolygon(polygon) {
cells = cells.concat(h3.polyfill(polygon, h3Resolution, true));
}
japan.features.forEach(feature => {
if (feature.geometry.type === 'MultiPolygon') {
feature.geometry.coordinates.map(addPolygon);
} else if (feature.geometry.type === 'Polygon') {
addPolygon(feature.geometry.coordinates);
}
});
return cells;
}
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.