Fork of Japan Country

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Fork of Japan Country

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Last edited Mar 26, 2023

Created on Mar 25, 2023

This example visualizes the Japan country shape as an interactive SVG map, where a slider controls the level of terrain simplification by filtering out triangular areas below a threshold. The map redraws dynamically on slider input and window resize, using topojson.presimplify to precompute simplification weights and d3.geoTransform with d3.geoPath to project only points meeting the threshold. The code loads geographic data from a remote TopoJSON file and applies a Mercator projection via d3.geoMercator, rendering the result as green-filled paths with black strokes.

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MIT Licensed

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