[contour-filled] Filled Contour Plot

[MarkusNeusinger]

Plot Type

contour-filled

Description

Filled contour plot with colored regions between contour lines. Shows 2D scalar field with gradient coloring.

Applications

• Topographic maps
• Weather data (temperature, pressure)
• Density estimation
• Mathematical function visualization

Data Requirements

• 2D grid of values (X, Y, Z)
• Regular or irregular grid

Notes

• Smooth color transitions between levels
• Optional contour lines overlay
• Colorbar showing value range
• Configurable number of levels

[claude]

✅ Spec ID: contour-filled

Rationale: Filled contour plots (using colored regions between level curves) are a distinct variant from basic contour plots (which show only isolines). This plot type uses contourf() style rendering with smooth color gradients between levels.

Add label approved to begin generation.

[github-actions]

✅ Specification Ready: contour-filled

PR: #2503

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specification.md

contour-filled: Filled Contour Plot

Description

A filled contour plot displays colored regions between level curves of a 2D scalar field, creating a smooth gradient visualization of continuous data. Unlike basic contour plots that show only isolines, filled contours use color bands to represent value ranges, making it easier to perceive gradual changes and identify regions of similar magnitude. This visualization is particularly effective for showing how a quantity varies continuously across a 2D surface.

Applications

• Creating topographic maps with elevation bands showing terrain height ranges
• Visualizing weather data such as temperature gradients, atmospheric pressure fields, or precipitation intensity
• Displaying probability density estimates and statistical distributions in 2D space
• Rendering mathematical functions to understand their behavior across a domain

Data

• x (numeric) - X-axis coordinates forming a regular grid
• y (numeric) - Y-axis coordinates forming a regular grid
• z (numeric) - Scalar values at each (x, y) grid point representing the surface
• Size: Grid of 30x30 to 100x100 points for smooth color transitions
• Example: Mathematical function z = f(x, y) evaluated on a meshgrid, such as Gaussian peaks or saddle surfaces

Notes

• Use a sequential or diverging colormap appropriate for the data range
• Include a colorbar to indicate the value mapping
• Consider overlaying contour lines for precise level identification
• Adjust the number of levels (typically 10-20) for appropriate detail
• Ensure grid resolution is sufficient to avoid jagged color boundaries

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Next: Add approved label to merge this specification to main.

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[MarkusNeusinger]

Implementation: 6/9 libraries