NCL precip diff 12lev

Summary

NCL precip diff 12lev is a diverging colormap from ncar. Two arms meet at a pivot of lightness 1.00, hue sweeps 187° from orange to blue, and order holds under all three colorblind simulations.

NCAR standard precipitation anomaly.

Perceptual profile (OKLCh)

• Lightness: 0.598 → 0.327 (range 0.672, min 0.327, max 0.999); non-monotonic; midpoint 0.999
• Chroma: min 0.002, max 0.130, mean 0.092
• Hue: 57.4° → 242.3° (span 187.4°), path monotonic-cw; quadrants: orange, yellow, chartreuse, green, mint, cyan, azure, blue
• Pivot: t 0.498, lightness 0.999, hue jump 45.3°, smoothness 0.553
• Endpoint temperature: warm → cool
• Perceptual ΔE: total 171.3, mean/step 0.672, max step 1.811, smoothness 0.500, speed 0.672

Colorblind safety (ΔE under simulated CVD)

• Protanopia: ΔE total 157.1; preserves order: yes
• Deuteranopia: ΔE total 147.3; preserves order: yes
• Tritanopia: ΔE total 136.1; preserves order: yes

Related

• Family: ncar
• Source: NCL/NCAR — UCAR (via hhuangwx/cmaps MIT wrapper)
• Similar diverging maps: NCL temp diff 18lev
• All colormaps