Featured image of post Cartogram

Cartogram

A tool for easily creating Japan and prefecture map cartograms

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What is this tool?

A unified web tool for creating cartograms from either nationwide prefecture data or municipality data within a selected prefecture. It distorts region area and shape according to statistical values, highlighting patterns that are difficult to see on a conventional map.

Features

  • Choose Japan or prefecture scope in one builder
  • Distort prefecture or municipality areas according to statistical values
  • Data value reflection: Map shapes change based on the data you input.
  • Ranking mode: Automatically generates ranking data sorted by value in descending order. Ranking data can be used for color coding.
  • Interactive display: Browse and interact with the map on the web.
  • Export as PNG or SVG images

How to use

    1. Specify your data…Upload or enter numerical data by region in CSV format (e.g., population, GDP, vote counts).
    1. Generate the cartogram…Based on the specified statistical values, a distorted cartogram of the Japan map is generated and displayed on screen.
  1. Adjust and review…Adjust parameters (color, degree of distortion, region label display, etc.) as needed and review the results.

Data formats

  • Tabular data (CSV)
Last updated on 2026-07-19