Vega-Altair is a declarative visualisation library for constructing statistical graphics through the Vega-Lite specification. Instead of directly controlling every graphical element, users describe how fields in their data should be represented visually.
The library separates the meaning of a chart from many of the implementation details required to render it. Data fields can be mapped to position, colour, size and other visual properties, with Vega-Lite handling much of the resulting graphical construction.
Vega-Altair is particularly suited to exploratory statistical analysis and reproducible reporting. Individual charts can be combined into larger visualisations, while interactive selections make it possible to examine relationships between different views of the same dataset.
This is free and open source software.
Key Features
- Declarative chart construction based on the Vega-Lite visualisation grammar.
- Encode data fields using position, colour, size, shape and other visual channels.
- Create point, line, bar, area, rect, text and other graphical marks.
- Compose charts through layering, horizontal and vertical concatenation.
- Build faceted and repeated charts for comparing subsets of data.
- Interactive selections and parameters for filtering and highlighting observations.
- Link interactions between different views of a dataset.
- Apply aggregation, filtering, calculations and other data transformations within chart definitions.
- Support quantitative, nominal, ordinal and temporal data types.
- Customisable scales, axes, legends, colour schemes and tooltips.
- Accept pandas DataFrames and other supported tabular data sources.
- Produce interactive charts within Jupyter notebook environments.
- Export charts as Vega-Lite specifications and supported graphical formats.
- Generate standalone HTML visualisations.
- Use reusable configuration and theming to maintain consistent visual presentation.
- Compose interactive analytical displays without manually writing browser-side rendering code.
Website: altair-viz.github.io
Support:
Developer: Vega-Altair contributors
License: BSD 3-Clause ‘New’ or ‘Revised’ License
Vega-Altair is written in Python. Learn Python with our recommended free books and free tutorials.
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