Radzen Blazor Chart with contour series (isoilluminance)
A contour chart turns a grid of values into filled bands and iso-lines, the way a topographic map shows elevation - ideal for scalar fields like temperature, illuminance, or any smooth surface.
- Use RadzenContourSeries (this demo) when samples lie on a numeric grid and you want smooth interpolation between them — the result looks continuous and is resolution-independent.
- Use RadzenHeatmapSeries when you want to show the raw sample cells without interpolation (each data point becomes one coloured rectangle).
- Use RadzenHeatmap for categorical grids (days × hours) where the axes are strings, not numbers.
Frequently asked questions
When should I use a contour chart?
When your data is a value sampled across a 2D grid and you want to see its shape - peaks, valleys, and gradients - as bands of color with optional iso-lines between them.
What data does it need?
Values on a regular X/Y grid. The chart interpolates between samples to draw smooth bands, and you can turn on iso-lines to outline each level.
Radzen Blazor Newsletter
Get an email when new components and releases ship.
Save Hours on Every Project
With Radzen Blazor subscription you get the full toolkit, including:
Dedicated support backed by proven expertise
Premium themes and theme editor
Ready-to-use UI blocks
Complete app templates
Visual design-time-experience
Radzen Blazor Components, © 2018-2026 Radzen.
Source Code licensed under
MIT
- DataGridkeyboard_arrow_down
- Data-bindingkeyboard_arrow_down
- Virtualizationkeyboard_arrow_down
- Columnskeyboard_arrow_down
- Filteringkeyboard_arrow_down
- Hierarchykeyboard_arrow_down
- Selectionkeyboard_arrow_down
- Sortingkeyboard_arrow_down
- Pagingkeyboard_arrow_down
- Groupingkeyboard_arrow_down
- Custom Headerkeyboard_arrow_down
- Save/Load settingskeyboard_arrow_down
- Drag & Dropkeyboard_arrow_down
- Data Visualization Updated keyboard_arrow_down
- Configurationkeyboard_arrow_down
- Area Chartkeyboard_arrow_down
- Bar Chartkeyboard_arrow_down
- Column Chartkeyboard_arrow_down
- Line Chartkeyboard_arrow_down
- Waterfall Chartkeyboard_arrow_down
- Part-to-Whole Chartskeyboard_arrow_down
- Scatter & Bubblekeyboard_arrow_down
- Financial Chartskeyboard_arrow_down
- Statistical & Interactivekeyboard_arrow_down
- Gaugeskeyboard_arrow_down
- Zoom & Navigationkeyboard_arrow_down
- Formskeyboard_arrow_down
- DropDownkeyboard_arrow_down
- HtmlEditorkeyboard_arrow_down
- Spreadsheet New keyboard_arrow_down
- PivotDataGridkeyboard_arrow_down
- Document Processing New keyboard_arrow_down
- Datakeyboard_arrow_down
- DataListkeyboard_arrow_down
- DataFilterkeyboard_arrow_down
- Ganttkeyboard_arrow_down
- Treekeyboard_arrow_down
- Navigationkeyboard_arrow_down
- Layoutkeyboard_arrow_down
- UI Fundamentalskeyboard_arrow_down
- App Templateskeyboard_arrow_down
- UI Blocks Prokeyboard_arrow_down
- Imageskeyboard_arrow_down
- Feedbackkeyboard_arrow_down
- Alertkeyboard_arrow_down
- Validatorskeyboard_arrow_down
Demos Configuration
Premium Themes
- Material 3
- Material 3 Dark
- Material 3 Expressive
- Material 3 Expressive Dark
- Fluent
- Fluent Dark
Free Themes
- Material
- Material Dark
- Standard
- Standard Dark
- Default
- Dark
- Humanistic
- Humanistic Dark
- Software
- Software Dark