Geographic projections, spherical shapes and spherical trigonometry.
d3‑geo provides a JavaScript library of spherical projections, geographic feature handling, and trigonometric utilities for turning GeoJSON data into projected coordinates on a map. It lets developers create and manipulate a wide range of D3 map visualizations—from standard projections to custom rotated views—making it ideal for geospatial data analysts, cartographers, and web developers building interactive maps with D3.js.
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