Interactive world contour map with real NOAA elevation data - drag the sea level from a drained Mariana Trench (-11000 m) to a submerged Everest (+8848 m) and watch coastlines redraw in real time. Zoom out to a globe. WebGL2, zero dependencies.
webgl gis globe data-visualization elevation webgl2 climate-change sea-level sea-level-rise bathymetry interactive-map etopo contour-map topographic-map
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Updated
Jul 9, 2026 - JavaScript