# Terrain

Canonical URL: https://colorcurio.us/colormaps/matplotlib.terrain
Source type: Colormap
Type: sequential
Collection: matplotlib
Attribution: matplotlib developers
License: matplotlib (BSD-derived)
Source: https://github.com/matplotlib/matplotlib/blob/main/lib/matplotlib/_cm.py
Tags: cartographic, terrain, land-and-sea
Stops: 256

## Summary

Terrain is a sequential colormap from the matplotlib collection. Inspect its perceptual lightness, chroma, and hue profile on colorcurio.us.

matplotlib default GIS ramp; blue→green→tan→white.

## Perceptual profile (OKLCh)

- Lightness: 0.391 → 1.000 (range 0.609, min 0.391, max 1.000); non-monotonic; midpoint 0.976
- Chroma: min 0.000, max 0.197, mean 0.107
- Hue: 275.9° → 0.0° (span 275.9°), path monotonic-ccw; quadrants: violet, blue, azure, cyan, mint, green, chartreuse, yellow, orange
- Endpoint temperature: cool → null
- Perceptual ΔE: total 221.1, mean/step 0.867, max step 3.016, smoothness 0.401, speed 0.867

## Colorblind safety (ΔE under simulated CVD)

- Protanopia: ΔE total 198.3; preserves order: no
- Deuteranopia: ΔE total 192.5; preserves order: no
- Tritanopia: ΔE total 187.1; preserves order: no

## Related

- Family: https://colorcurio.us/colormaps/families/matplotlib
- All colormaps: https://colorcurio.us/colormaps