A data-driven JavaScript API for creating interactive thematic vector maps in the browser, built on D3 and SVG.
mapmap.js is a JavaScript API designed to simplify the creation of interactive thematic vector maps in web browsers. It handles loading geographic data and geometry, joining them, and applying visual styles and interactions, all built on D3 and outputting as SVG. It solves the problem of complex, boilerplate-heavy code for data-driven web cartography.
Cartographers, data visualization developers, and researchers who need to create interactive statistical or thematic maps for the web without deep low-level D3 expertise.
Developers choose mapmap.js because it provides a high-level, declarative API that abstracts the tedious parts of web mapping (data loading, joining, symbolization) while retaining the power and flexibility of D3, making it faster to produce professional interactive maps.
A data-driven API for interactive thematic maps
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Supports joining CSV or JSON data with GeoJSON using primary keys or custom MapReduce functions, simplifying complex transformations as shown in the data joining examples.
Enables choropleth mapping with customizable color scales and metadata for human-readable labels, allowing quick thematic map creation without low-level D3 code.
Includes zoom and hover info tooltips out of the box, reducing the need for custom interaction code and enhancing user engagement with minimal setup.
Handles loading of geometry and data files internally with a pseudo-synchronous API, ensuring operations occur only after resources are ready, as demonstrated in the async example.
The GNU Affero General Public License requires publishing source code for derivative works, which can be a barrier for commercial or proprietary projects, as noted in the README.
Built on D3 v3, which is an older version and might lack compatibility with newer D3 features or community support, potentially limiting future upgrades.
Requires specific SVG element setup with width/height attributes and a positioned parent element, adding overhead for simple integrations, as detailed in the usage instructions.