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TP_4

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SSebDelSab
Last edited Dec 8, 2017
Created on Nov 30, 2017

This choropleth map visualizes the cumulative number of influenza cases per French region for the week of November 11, 2014, using a green color scale to encode incidence rates. The map loads geographical boundaries from an external GeoJSON file, while case data from the CSV file is merged into the GeoJSON features based on matching region names. The visualization is built with D3 v4, using `d3.geoConicConformal` for the map projection, `d3.geoPath` to render regions, and `d3.scaleQuantize` for color classification. Hovering over a region displays a tooltip with its name and cumulative case count.

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TP4

This choropleth map displays the cumulative number of influenza cases across French regions for the weeks of November 2014. Each region is colored on a five-step green scale, with darker shades indicating higher totals, and hover tooltips reveal exact values. The visualization merges CSV data with geographic boundaries using D3’s `d3.geo.path` with a conic conformal projection, while `d3.scale.quantize` maps data values to the color range. The code also demonstrates layering multiple GeoJSON loads and integrating mouse events for interactive detail.

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