GMT drywet

Summary

GMT drywet is a sequential colormap from ncar. Lightness spans 0.33–0.88, hue sweeps 196° from yellow to violet, and order breaks under protan and tritan simulation.

NCL GMT_drywet land moisture ramp.

Perceptual profile (OKLCh)

• Lightness: 0.537 → 0.332 (range 0.556, min 0.327, max 0.883); non-monotonic; midpoint 0.856
• Chroma: min 0.088, max 0.239, mean 0.156
• Hue: 75.6° → 260.9° (span 196.2°), path monotonic-cw; quadrants: yellow, chartreuse, green, mint, cyan, azure, blue, violet
• Endpoint temperature: warm → cool
• Perceptual ΔE: total 176.8, mean/step 0.693, max step 1.141, smoothness 0.639, speed 0.693

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 140.7; preserves order: no
• Deuteranopia: ΔE total 138.3; preserves order: yes
• Tritanopia: ΔE total 151.2; 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 topo, MPL terrain (NCL), NCL precip 15lev, NCL temp 19lev, NCL topo 15lev, NCL wind 17lev
• All colormaps