A collection of D3.js composite map projections for visualizing countries with distant territories.
d3-composite-projections is a JavaScript library that provides a set of custom map projections for D3.js, designed to visualize countries with geographically distant territories on a single map. It addresses the limitation of standard projections that often distort or separate a country's non-contiguous regions, such as overseas departments or islands. The library includes projections for specific countries like the USA, France, Portugal, and Japan, enabling accurate and cohesive geographic data visualization.
Data visualization developers, cartographers, and GIS professionals working with D3.js who need to create maps for countries with dispersed territories, such as for government data, statistical reports, or interactive dashboards.
Developers choose d3-composite-projections because it offers specialized, ready-to-use projections that standard D3.js lacks, saving time and ensuring geographic accuracy. Its seamless integration with D3.js and support for both SVG and Canvas make it a practical tool for creating detailed, country-specific maps without custom projection development.
Set of d3 projections for showing countries distant lands together
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Includes ready-to-use projections for countries like the USA, France, and Japan, ensuring accurate representation of non-contiguous territories, as demonstrated in the linked bl.ocks examples in the README.
Works exactly like standard D3 projections such as geoAlbersUsa, making it easy to adopt for existing D3.js workflows, as shown in the usage code snippets that mirror D3's API.
Provides methods like getCompositionBorders() and drawCompositionBorders() to clearly separate projection zones, enhancing map readability, as detailed in the README's SVG and Canvas examples.
Supports both SVG and Canvas rendering and can be used in browsers or Node.js, offering versatility for different project needs, as mentioned in the installation and usage sections.
Only supports a fixed set of countries; if you need a composite projection for a country not included, you must develop it yourself, which requires advanced cartographic skills and isn't documented.
The library is version-locked to D3 v6, with a separate branch for v3, potentially causing compatibility issues with newer D3 versions or requiring manual migration efforts, as noted in the USAGE section.
While examples are provided, the README lacks detailed guidance on creating custom composite projections, making it challenging for developers to extend beyond the pre-defined options without deep D3 knowledge.