{"version":"1.0","type":"rich","title":"Quadtree Panning & Zooming PoC","description":"This example demonstrates an adaptive quadtree-based rendering technique for panning and zooming over geographic data. It visualizes world country boundaries from the visionscarto-world-atlas dataset using a Mercator projection via `d3.geoMercator` and `d3.geoPath`. A grid of points covering the northeastern United States is indexed into a `d3.quadtree`, which is then traversed during zoom to draw colored rectangles that subdivide the viewport only to the necessary depth, with a visible cutoff threshold. Pan and zoom interactions are handled by `d3.zoom` and `d3.zoomIdentity`.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/a52c7a9255a84e99aca0b5474b27d523?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}