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world map 02 update to d3 v4

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LLjfernando
Last edited May 8, 2017
Created on May 8, 2017

This world map example visualizes global population data by country using a choropleth map. The visualization employs a threshhold color scale to categorize population ranges, with tooltips showing specific country names and population values on hover. The code uses d3 v4 APIs including `d3.geoPath` for map rendering, `d3.scaleThreshold` for color encoding, and d3-tip for interactive tooltips. Population data comes from a TSV file, while country boundaries are drawn from a topojson file of world geometries.

AI-generated description

this iteration uses d3 version 4

the changes to update from d3v3 to d3v4 were pretty straightforward - mostly camelCasing scale names. a goal of this series of examples is to make it easier for someone learning to use d3 to understand what is happening. One way to do that is to make a whole new example at each new conceptual change.

do check out the other examples in this world map series:

world map 00 original example
world map 01 fix tooltip value
world map 02 d3 v4
world map 03 es2015 + update code style
world map 04 manual breaks + threshold scale
world map 05 linear breaks + quantize scale
world map 06 linear breaks + quantiles scale
world map 07 Jenks natural breaks
world map 08 ckmeans cluster max breaks
world map 09 ckmeans cluster min breaks

forked from <a href='http://bl.ocks.org/micahstubbs/'>micahstubbs</a>'s block: <a href='http://bl.ocks.org/micahstubbs/8e15870eb432a21f0bc4d3d527b2d14f'>world map 02 update to d3 v4</a>

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