Raster
Mandelbrot Set Explorer
Interactive fractal visualization of the Mandelbrot set using Observable Plot’s raster mark with a computed fill function. The raster iterates z = z² + c for each pixel in the complex plane and colors by escape iteration count, with points inside the set rendered in black. Users can explore the fractal via 10 preset regions (Full Set, Seahorse Valley, Elephant Valley, Double Spiral, Mini Mandelbrot, Lightning, Spiral Arms, Dendrite, Triple Spiral, Scepter Valley), a directional pad for panning (up/down/left/right), zoom in/out buttons, a home button to reset to the full set view, a max iterations slider (20–200, default 80) that controls detail and color depth, and a color scheme picker with 12 sequential/diverging palettes (Turbo, Viridis, Magma, Inferno, Plasma, Cividis, YlGnBu, Blues, Oranges, RdYlBu, Spectral, BuPu). Current center coordinates and zoom level are displayed below the chart. The chart renders with aspect ratio 1 and pixel-level resolution.
Projected Raster — Water Vapor
Global precipitable water vapor visualization rendered as a projected raster using Observable Plot’s raster mark. A deterministic 360×180 grid of water vapor values (0–6 cm range) simulates realistic atmospheric patterns — higher values near the equator, lower at poles, with reduced vapor over continental land masses. Users can switch between 8 map projections (equal-earth, equirectangular, orthographic, stereographic, mercator, natural-earth1, azimuthal-equal-area, conic-equidistant), choose from 13 color schemes (BuPu, YlGnBu, Viridis, Magma, Inferno, Plasma, Turbo, Blues, Greens, Oranges, RdYlBu, Spectral, Cividis), select interpolation mode (barycentric, random-walk, nearest, none), adjust the color domain maximum via slider (1–10), and toggle sphere outline and graticule overlays. Summary statistics (min, mean, max vapor and grid dimensions) are displayed above the chart. A color legend labeled “Water vapor (cm)” is shown.
Volcano Raster
Topographic heatmap of a volcanic surface rendered with Observable Plot’s raster mark. An 87×61 grid of deterministically generated elevation values (94–195 m range) is visualized as a colored raster image. Users can pick from 12 color schemes (YlGnBu, Viridis, Magma, Inferno, Plasma, Turbo, Blues, Greens, Oranges, RdYlGn, Spectral, Cividis), adjust a blur slider (0–10px) for smoothing, switch between smooth (bilinear) and pixelated rendering modes, and toggle contour line overlays with adjustable level count (4–30) and opacity (0.1–1.0). Summary statistics (min, mean, max elevation and grid dimensions) are shown above the controls. The chart has an aspect ratio of 1 and includes a color legend labeled “Elevation (m)”.