Map (ICE-8 Q1) — Explanation

What the code does

• Loads TopoJSON for world countries (110m) and converts to GeoJSON via topojson.feature.
• Uses country-names.tsv to map numeric IDs to country names, then joins with my CSV (name,value).
• Projects with Natural Earth (d3.geoNaturalEarth1) and draws a graticule for context.
• Colors countries using a quantized color scale with a legend.
• Adds tooltips on hover (country + formatted value).

Data

• country_data_sample.csv contains a metric per country (example: population in millions).
• To replace the metric, edit the CSV and keep the name,value columns.

How it meets the rubric

• Runs on VizHub without errors and uses TopoJSON (10 pts).
• Commented code + explanation (10 pts).
• World map rendered (10 pts).
• Linked custom data via CSV (15 pts).

Sources (from course tutorial)

• World Atlas TopoJSON + d3 links as provided in the tutorial PDF.