D3 map drag demo
This example presents an interactive orthographic globe rendered with SVG. Users can click and drag to rotate the projection, which dynamically updates the graticule and country boundaries. The visualization uses d3.geoOrthographic, d3.geoPath, d3.zoom, and d3.drag to handle the interaction. Country polygons come from the world-atlas TopoJSON dataset, with names from the accompanying TSV file displayed as tooltips.