class-02 demo

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Last edited Feb 18, 2017

Created on Feb 18, 2017

This example plots earthquake data from the USGS feed as filled paths on a map of Oklahoma, using county and state boundary shapes from a TopoJSON file. The visualization uses an Albers USA projection via `d3.geoPath` to render both the geographic outlines and the quake features, with a threshold magnitude of 2.5 filtering the displayed events. Earthquakes appear as crimson semi-transparent shapes, while the map layer is drawn separately in a background group. The code also logs earthquake counts for California and the earliest event time to the console.

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This example shows a map of Oklahoma with earthquake locations plotted as semi-transparent crimson points, sized by their position on the map. The visualization filters earthquake data to only include events with a magnitude of 2.5 or greater. It uses d3 v4's `d3.geoAlbersUsa` projection and `d3.geoPath` to render SVG paths for state and county boundaries, sourced from TopoJSON data, while earthquake data comes from the USGS feed.

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