Question 1

How do I use Topogram with my own GeoJSON data?

Accepted Answer

First, convert your GeoJSON to TopoJSON for efficiency, then use Topogram's functions with D3 to load and process the data, similar to the example in the README. You'll need to handle data binding and rendering through D3 methods.

Question 2

What's the performance like for generating cartograms with large datasets?

Accepted Answer

Performance can degrade with large or complex datasets due to the algorithm's computational intensity. It's best suited for moderate-sized geographies or pre-computed visualizations rather than real-time processing.

Question 3

Can I animate transitions between cartograms in Topogram?

Accepted Answer

Animations aren't natively supported; you'd need to implement them manually using D3's transition functions, which can be complex given the algorithm's output geometry changes.

Question 4

Topogram vs D3 alone for proportional maps – which is better?

Accepted Answer

Topogram provides a specialized, algorithm-driven solution for accurate cartograms, saving development time compared to building from scratch in D3. However, D3 alone offers more flexibility for other map types and customizations.

Question 5

How to style the output cartograms in Topogram?

Accepted Answer

Styling is handled entirely through D3, so you apply CSS or D3's methods to SVG elements after Topogram generates the geometries. There are no built-in styling options, requiring custom work.

Question 6

Is Topogram suitable for server-side rendering with Node.js?

Accepted Answer

Yes, it can run on Node.js for server-side generation, but performance might be a bottleneck for large-scale use due to the algorithm's resource demands, so caching results is advisable.

d3-topogram

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