GMT topo

Summary

GMT topo is a sequential colormap from ncar. Lightness spans 0.61–1.00, hue sweeps 360° from red to orange, and order breaks under protan, deutan, and tritan simulation.

NCL GMT_topo bathymetry+topography in one ramp.

Perceptual profile (OKLCh)

• Lightness: 0.684 → 1.000 (range 0.393, min 0.607, max 1.000); non-monotonic; midpoint 0.733
• Chroma: min 0.000, max 0.176, mean 0.081
• Hue: 6.3° → 17.5° (span 360.0°), path monotonic-ccw; quadrants: red, rose, magenta, violet, blue, azure, cyan, mint, green, chartreuse, yellow, orange
• Endpoint temperature: warm → null
• Perceptual ΔE: total 305.9, mean/step 1.200, max step 27.514, smoothness 0.000, speed 1.000

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 235.1; preserves order: no
• Deuteranopia: ΔE total 246.8; preserves order: no
• Tritanopia: ΔE total 273.6; preserves order: no

Related

• Family: ncar
• Source: NCL/NCAR — UCAR (via hhuangwx/cmaps MIT wrapper)
• Similar sequential maps: NCL CBR drywet, NCL CBR wet, GMT drywet, MPL terrain (NCL), NCL precip 15lev, NCL temp 19lev, NCL topo 15lev, NCL wind 17lev
• All colormaps