About Geographic Map Visualizer

Generate geographic maps with data overlays and regional highlighting. Part of the DevTools Surf developer suite. Browse more tools in the Data / SQL collection.

Use Cases

• Visualize sales data by region or country as a choropleth to identify geographic patterns.
• Plot customer locations as a bubble map with bubble size representing revenue or engagement.
• Highlight specific countries or states for a market expansion analysis presentation.
• Generate a heatmap overlay showing population density or event frequency by location.

Tips

• Use GeoJSON input for precise boundary overlays — the tool renders both point data and polygon regions from standard GeoJSON FeatureCollections.
• Choose choropleth coloring for regional comparisons and bubble maps for absolute value comparisons — each communicates a different kind of data relationship.
• Export as SVG for presentations where the map needs to be annotated or resized — SVG scales to any resolution without pixelation.

Fun Facts

• Choropleth maps (regions shaded by data value) were invented by Charles Dupin in 1826 to map literacy rates across France — the first known thematic map using this technique.
• GeoJSON was standardized as RFC 7946 in 2016. It replaced older formats like KML and Shapefile for web mapping because it's human-readable JSON compatible with JavaScript's native data structures.
• The Mercator projection (1569), still used by Google Maps, increasingly distorts area at high latitudes — Greenland appears comparable in size to Africa on Mercator maps, despite Africa being 14x larger in actual area.

FAQ

What data formats does it accept?

GeoJSON FeatureCollections, CSV with latitude/longitude columns, and named region data (country names, US state abbreviations). All are auto-detected on paste.

Which map projection does it use?

Web Mercator (EPSG:3857) by default, matching standard web maps. Switch to Albers Equal-Area for US-focused maps or Robinson projection for world maps where area accuracy matters.

Can I customize the color scale?

Yes — sequential (single-hue), diverging (two-hue), and qualitative palettes are configurable. Colorblind-safe palettes (Viridis, ColorBrewer) are included as presets.