Spikes (Double) Map

Spikes (Double) Map

The double spikes map extends the standard spike map by rendering two sets of columns per location — typically in contrasting colors — rising from the same geographic point. This allows two related or competing metrics to be compared spatially without switching between views or overlaying separate maps.

• Side-by-side geographic comparison 

  Two spike series at each location make it immediately clear where one metric dominates the other, and where the two are balanced — revealing competitive dynamics or proportional relationships across geography.

• Directional magnitude 

  Spike height encodes value, so taller columns instantly communicate higher quantities. The dual format adds a comparative layer that a single spike map cannot provide alone.

• Correlation & divergence 

  Where spikes of both colors are tall, a location has high values on both metrics. Where they diverge, the map exposes geographic imbalances — a powerful signal for resource allocation or market analysis.

• When to avoid it

  Dense regions can become visually overwhelming when both spike sets overlap heavily. Keep color contrast strong and use interactivity to let users isolate each series when needed.

Best suited for comparative geographic analysis — such as supply vs. demand by region, two competing product lines by territory, or actual vs. target performance across locations.